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RRB · Refrigeration and Air Conditioning Mechanic

23/01/2019 (8:30 AM - 11:00 AM) — Refrigeration and Air Conditioning Mechanic

2019 · 175 questions · First 10 Solutions Free
Questions 1–10 have full step-by-step solutions visible. Sign in to unlock all 175 →
Q1 mcq
Ina steady-flowing river, a boat goes a certain distance upstream at a speed of 12 km/h and comes back the same distance at 24 knv/h. Find the average speed for the total journey. 15 knvh 4
a.
15 knvh
b.
16 knv/h Correct Answer
c.
18 knv/h
d.
20 km/h

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Q2 mcq
Find the missing number in the given series. —1.3, -0.8, -0.3, ? , 0.7, 1.2 4 OL
a.
OL
b.
0.3
c.
0.4
d.
0.2 Correct Answer

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Q3 mcq
a.
IGH
b.
CEF Correct Answer
c.
E
d.
G

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Q4 mcq
The author of 'The Monk Who Sold His Ferrari’ is : Arvind Adiga 4
a.
Arvind Adiga
b.
Robin Sharma Correct Answer
c.
Manohar Malgonkar
d.
Arundhati Roy

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Q5 mcq
Both I and II are implicit 4
a.
Both I and II are implicit
b.
Only assumption I is implicit Correct Answer
c.
Only assumption II is implicit
d.
Neither I nor II is implicit

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Q6 mcq
A trader buys 60 bags of grain at 2 400 each. If he sells 18 bags at 8% profit, at what price should he sell the remaining bags to make 16.4% overall profit on selling the 60 bags? VW 2480
a.
2480 Correct Answer
b.
2 500
c.
2540
d.
2520

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Q7 mcq
An object with greater has greater inertia velocity 4
a.
velocity
b.
acceleration
c.
volume
d.
mass Correct Answer

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Q8 mcq
‘What is the diameter (in em) of a sphere of surface area 1386 cm? ? 4 14
a.
14
b.
21 Correct Answer
c.
10.5
d.
24.5

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Q9 mcq
An arrowhead at the end of a dimension line is approximately Jong and 1 mm wide. VW 3mm
a.
3mm Correct Answer
b.
Smm
c.
imm
d.
L.5mm

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Q10 mcq
Select the option that is related to the third word on the same basis as the second word is related to the first word. Letter : Envelope :: Dagger : ? Sheath VW
a.
Sheath Correct Answer
b.
‘Weapon
c.
Sword
d.
Sharp

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Q11 mcq
Find the work done (in kJ) if a force of 750 N pushes a cart of mass 30 kg by 16 m. 4 24
a.
24
b.
12
c.
36
d.
48
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Q12 mcq
Choose the figure which is different from the rest. N HZ ic FD A EQ 4
a.
N HZ ic FD A EQ
b.
Zz cH FAN Q DE
c.
H DN FOZ CEA
d.
Acq Z ode NF H
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Q13 mcq
Ina certain code language, '+' represents '«', '=' represents '+', '" represents '+' and '*' represents '. Find out the answer to the following question. 12-624 10«5:=? 4 50
a.
50
b.
37
c.
23
d.
16
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Q14 mcq
20 — 2[25% of (15 x 8+6+ 12)]= VW 4
a.
4
b.
6
c.
10
d.
8
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Q15 mcq
Which hazardous substance can cause lung cancer? Benzene vapours 4
a.
Benzene vapours
b.
Asbestos particles
c.
Herbicides
d.
Arsenic
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Q16 mcq
210 mm x 297 mm are the dimensions of size paper. VW A4
a.
A4
b.
A2
c.
A3
d.
Al
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Q17 mcq
Find mass of an iron cube of side 2 cm. (Density of iron is 7.8 gm/cm?) 3.9 gm 4
a.
3.9 gm
b.
0.975 gm
c.
15.6 gm.
d.
62.4 gm
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Q18 mcq
If A, B and C can do a task working alone in 12, 18 and 36 days respectively. They all work together for 2 days, then B quits. How many days A and C working together will take to complete the remainder of the task? VW 6
a.
6
b.
3
c.
4
d.
9
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Q19 mcq
Which of the following gases is a highly poisonous, odourless, tasteless and colourless gas? Carbon dioxide 4
a.
Carbon dioxide
b.
Carbon monoxide
c.
Methane
d.
Nitrogen dioxide
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Q20 mcq
Green and yellow vegetables in our diet mostly provide us which element as food? Copper 4
a.
Copper
b.
Sodium
c.
Zine
d.
Potassium
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Q21 mcq
4 BDCA
a.
BDCA
b.
BDAC
c.
DBCA
d.
DBAC
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Q22 mcq
Find the specific heat capacity (in Jg+K~) of a block of metal of mass 500 g, the temperature of which rises by 80 °C when it absorbs 10 kJ of heat? 4 0.4
a.
0.4
b.
0.16
c.
1.56
d.
0.25
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Q23 mcq
Ifa—b=5 and ab =14, then find a2 + b?? VW 53
a.
53
b.
27
c.
5
d.
19
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Q24 mcq
‘What is the area (in cm2) of an equilateral triangle of side 8 cm? 32V3 4
a.
32V3
b.
8\3
c.
64\3
d.
16V3
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Q25 mcq
is the physiological adjustment by an organism to environmental change. Bioremediation 4
a.
Bioremediation
b.
Bioaccumulation
c.
Cogeneration
d.
Acclimation
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Q26 mcq
Choose the letters which are different from the rest. 4 HIL
a.
HIL
b.
PRT
c.
VIR
d.
UWY
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Q27 mcq
Binary 110110101 is equal to decimal : 4 333
a.
333
b.
437
c.
349
d.
477
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Q28 mcq
A/An is software used to maintain the security of a private network. malware 4
a.
malware
b.
encryption
c.
firewall
d.
clickbait
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Q29 mcq
Who was the chairman of the Constitution Drafting Committee? Jawaharlal Nehru 4
a.
Jawaharlal Nehru
b.
Dr. BR Ambedkar
c.
Dr. Rajendra Prasad
d.
Sardar Patel
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Q30 mcq
‘Two cars, X and Y, travel from A to B at average speeds of 50 km/hr and 75 km/hr respectively. If X takes 2 hours more than Y for the journey, then the distance between A and B in km is 4 600
a.
600
b.
400
c.
800
d.
300
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Q31 mcq
The Umaid Bhawan Palace is in which city? Jaipur 4
a.
Jaipur
b.
Jodhpur
c.
Bikaner
d.
Udaipur
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Q32 mcq
A and B start to walk from point P towards point Q. The distance between P and Q is 9 km. B starts 4 minutes after A. A, on reaching Q, immediately returns and after walking a kilometre meets B. If A's speed is a kilometre in 10 minutes, what is B's speed in kilometres per minute? VIS 4
a.
VIS
b.
Vs
c.
1/12
d.
1/6
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Q33 mcq
If A SB means A is the husband of B, A # B means A is the brother of B and A * B means A is the mother of B, then what does PS Q* R#S mean? P is the father of S VW
a.
P is the father of S
b.
P is the brother-in-law of S
c.
P is the son of S
d.
P is the brother of S
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Q34 mcq
What is the angle between the hour hand and the minute hand at half past two? 105° VW
a.
105°
b.
75°
c.
120°
d.
90°
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Q35 mcq
Classical musician Shivkumar Sharma is associated with which musical instrument? Shehnai 4
a.
Shehnai
b.
Tabla
c.
Violin
d.
Santoor
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Q36 mcq
If 36 J of work is done in moving a charge Q across 8 V, find Q (in coulombs). 4 288
a.
288
b.
9
c.
45
d.
16
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Q37 mcq
Pipe A can fill a tank in 6 hours. Pipe B can empty it in 15 hours. If both the pipes are opened together, then the tank will be filled in how many hours? 4 9
a.
9
b.
8
c.
12
d.
10
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Q38 mcq
If half a litre of hot water at 90°C is mixed with three and a half litres of cold water at 10°C, find the final equilibrium temperature (in °C) if no heat is lost. VW 20
a.
20
b.
40
c.
30
d.
50
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Q39 mcq
VW 3
a.
3
b.
12
c.
9
d.
6
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Q40 mcq
One statement is given followed by two conclusions. Decide which of the given conclusions can definitely be drawn from the given statement. Statement: As income increases, cars become more affordable. Conclusion I: With greater use of technology, cars are now cheaper than they were a generation ago. Conclusion II: Cars will become so numerous that no future technology will solve the traffic problem. Only conclusion I follows 4
a.
Only conclusion I follows
b.
Both I and II follow
c.
Neither I nor II follows
d.
Only conclusion II follows
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Q41 mcq
Which of the following folk dances is from Assam? Giddha 4
a.
Giddha
b.
Lezim
c.
Nati
d.
Bagurumba
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Q42 mcq
What is the relative density of a solid of mass 50 gm which when fully immersed in water weighs 10 gm? 4 5
a.
5
b.
1.25
c.
25:
d.
0s
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Q43 mcq
—100° Celsius = Fahrenheit 4 BY & sa)
a.
BY & sa)
b.
—148°
c.
T7337
d.
ee TP
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Q44 mcq
When a number is increased by 36, it becomes 109% of itself. What is the number? 4 300
a.
300
b.
450
c.
360
d.
400
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Q45 mcq
Two children, weighing 30 kg and 15 kg, sit on one side of a see-saw at a distance of 1 m and 1.2 m respectively, from the fulcrum. A boy of 'M' kg sits on the other side of the see-saw at a distance of 1.2 m from the fulcrum, and the see- saw is in equilibrium. Find M. 4 36
a.
36
b.
45
c.
48
d.
40
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Q46 mcq
Rearrange the parts of the sentence in correct order. In terms of reasons that a customer X - possibility is that they've actually finished changing, but Y - might not come out of the changing room, one Z - the clothes are hopelessly unsuitable VW Y¥XZ
a.
Y¥XZ
b.
IX
c.
XZY
d.
ZXY
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Q47 mcq
If the speed of a car increases from 54 km/hr to 90 knv/hr, its kinetic energy would increase in the ratio . 3/5 4
a.
3/5
b.
4/9
c.
O16
d.
9/25
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Q48 mcq
Find the length (in cm) of the edge of a cube of a piece of wood which weighs 80 N. (Use g = 10 mvs”, density of wood = lgicm?) 4 60
a.
60
b.
20
c.
80
d.
40
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Q49 mcq
a.
12
b.
20
c.
10
d.
25
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Q50 mcq
A bullet travels 90 m in 0.2 seconds. Find its speed in km/hr. 4 162
a.
162
b.
1,620
c.
1,250
d.
125
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Q51 mcq
Two resistors of R 2 and 60 Q are connected in parallel to get an effective resistance of 24 Q. Find R. 4 56
a.
56
b.
64
c.
48
d.
40
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Q52 mcq
Antihistamines are found in some first-aid boxes. When should these drugs be taken? To aid in clotting of blood 4
a.
To aid in clotting of blood
b.
To ease the symptoms of hay fever and other allergies
c.
To ease indigestion and heartburn
d.
To bring relief from asthma
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Q53 mcq
A postman starts from the post office and cycles 13 km south, then turns west and cycles 10 km, then turns north and cycles 8 km, then turns east and cycles 2 km and then tums to his left and cycles 5 km. Where is he now with reference to his starting position? 8 km east 4
a.
8 km east
b.
12 km east
c.
12 km west
d.
8 km west
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Q54 mcq
Acceleration due to gravity on moon is 1/6th that on earth. How much would an astronaut weigh on moon if he weighs 90 kgf on earth? (acceleration due to gravity on earth = 10m/s2) 4 15N
a.
15N
b.
150N
c.
o90N
d.
ON
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Q55 mcq
Find the power (in W) of a pump if it can lift | tonne of water by 90 m in 30 minutes. (Assume 100% efficiency and use g=10 ms?) 4 50
a.
50
b.
250
c.
25
d.
500
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Q56 mcq
Here are some words from an artificial language. unacri means lighthouse bancri means lightweight banetu means overweight ‘Which word swould:mean ‘overdrive’? adiban 4
a.
adiban
b.
adietu
c.
simuna
d.
criteh
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Q57 mcq
4 37.50%
a.
37.50%
b.
25% %
c.
20%
d.
22.50%
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Q58 mcq
At present, the ratio between the ages of Anu and Dimpy is 5 : 8. After 2 years, the ratio of their ages will become 2 : 3. What was Dimpy’s age before 2 years? 4 10
a.
10
b.
12
c.
16
d.
14
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Q59 mcq
Only conclusion I follows VW
a.
Only conclusion I follows
b.
Only conclusion III follows
c.
All conclusions I, II and III follow
d.
Only conclusion I and III follow
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Q60 mcq
To is to prepare a storage medium, usually a disk, for reading and writing. format VW
a.
format
b.
defrag
c.
map
d.
boot
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Q61 mcq
Choose the one which is different from the rest. Father 4
a.
Father
b.
Son
c.
Mother-in-law
d.
Brother
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Q62 mcq
Which of the following is NOT a base unit? mole 4
a.
mole
b.
ampere
c.
radian
d.
candela
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Q63 mcq
Who invented the blue jeans? Levi Strauss VW
a.
Levi Strauss
b.
Todd Oldham
c.
Calvin Klein
d.
Gianni Versace
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Q64 mcq
Which of the following is the correct relation between resistance 'R’, conductivity 'o', length 'L' and area of cross section ‘A' of a metal wire? 4 RL=Ao
a.
RL=Ao
b.
RoA=L
c.
RA=Lo
d.
o=RL/A
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Q65 mcq
Select the option that is related to the third word on the same basis as the second word is related to the first word. Poem : Stanza :: Book : ? Language 4
a.
Language
b.
Story
c.
Page
d.
Printing
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Q66 mcq
Find the value of 5 Sin@ — 2 Cosec®, if @ = 30°. 3/2. 4
a.
3/2.
b.
“3/2
c.
2/3
d.
2/3
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Q67 mcq
Ina certain gear train, the driver has 18 teeth while the follower has 8 teeth. For every 16 tums of the driver, the follower turns times. 4 18
a.
18
b.
8
c.
36
d.
9
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Q68 mcq
Farad per metre is the unit of. ‘watt per steradian 4
a.
‘watt per steradian
b.
permittivity
c.
permeability
d.
electric conductance
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Q69 mcq
Which of the following is an example of a first class lever? Ice tongs 4
a.
Ice tongs
b.
Wheel barrow
c.
A pair of scissors
d.
Nut cracker
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Q70 mcq
If 5x/2 - 1/4 (6x — 5/3) = 7/6, then the value of x is . 5/4 4
a.
5/4
b.
3/4
c.
3/7
d.
5/7
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Q71 mcq
Find the highest common factor of 506 and 782. 4 29
a.
29
b.
34
c.
46
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Q72 mcq
An executive eams a salary of = 12,600 every month, and he spends 5/7 of it. If his salary increases by 1/3rd and his spending increases by L/Sth of the present expenditure, what fraction of his salary will he save? 7/16 4
a.
7/16
b.
s/s
c.
TWAS
d.
5/14
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Q73 mcq
A alone can do a task in 35 days and B alone in 14 days. If they work on it together for 5 days, then what fraction of the task is left? Quarter 4
a.
Quarter
b.
One-thirds
c.
Half
d.
Three fourths
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Q74 mcq
If$#12=10;54#9=7:6# 10=8, then find the value of 14 # 4. 4 10
a.
10
b.
9
c.
5
d.
3
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Q75 mcq
In the following question, which set of letters and numbers, when sequentially placed at the gaps in the given series, shall complete it? 1_2x_bb_yy_cc_6zzz VW a34S5c
a.
a34S5c
b.
3a45b
c.
3a4b5
d.
3a45c
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Q76 mcq
Find the specific latent heat of vaporisation of 1.25 g of nitrogen (in Jg"), if it releases 250 joules of heat when it condenses at its boiling point of 196° C. 4 469
a.
469
b.
500
c.
312.5
d.
200
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Q77 mcq
A map converts colour intensity or grayscale information to heights to give the appearance that features are raised above the surface, like embossed letters. shade 4
a.
shade
b.
bump
c.
tone
d.
tint
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Q78 mcq
A truck of mass 5000 kg accelerates from 25 m/s to 35 m/s. Find the change in its kinetic energy (in MJ). 4 1
a.
1
b.
25:
c.
L5
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Q79 mcq
Find the potential difference (in V) across a resistance of 2.5 kQ through which a 2 mA current flows. VW 5
a.
5
b.
0.2
c.
1.25
d.
0s
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Q80 mcq
The Living Planet Report, released every two years, is the flagship publication of which organisation? The Nature Conservancy 4
a.
The Nature Conservancy
b.
World Wide Fund for Nature
c.
Conservation International
d.
Wildlife Conservation Society
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Q81 mcq
Ina certain code DIRTY is coded as 24759 and FOAM is coded as 1863. Using the same code ARID will be coded as 4 2489
a.
2489
b.
9165
c.
1579
d.
6742
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Q82 mcq
The sum of two binary numbers 1101111 and 1100101 is . 4 100011100
a.
100011100
b.
100000110
c.
11110000
d.
11010100
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Q83 mcq
Which team won the Indian Premier League (IPL) in 2018? Hyderabad Sunrisers 4
a.
Hyderabad Sunrisers
b.
Chennai Super Kings
c.
Royal Challengers Bangalore
d.
Kolkata Knight Riders
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Q84 mcq
Find the heat capacity of a pan of mass 200 g, if its temperature rises by 8° C on receiving 2000 J of heat. 250 IK? VW
a.
250 IK?
b.
s3K!
c.
50 Ike kK!
d.
1.25 kg Kl
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Q85 mcq
If3A=6B=7C; find A: B:C. 4 122733
a.
122733
b.
Ta Vas
c.
14:7:6
d.
1273212
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Q86 mcq
(0.1? - 0.025%) + (0.1 — 0.025) = . 4 0.325
a.
0.325
b.
0.125
c.
0.625
d.
0.25
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Q87 mcq
Find the co-ordinates of the midpoint of the segment joining the points (4,7) and (2,3). (-1,5) VW
a.
(-1,5)
b.
(-2.3)
c.
(1-5)
d.
(2.4)
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Q88 mcq
The National Skills Development Corporation (NSDC) is a public-private partnership formed under India’s : Ministry of Finance VW
a.
Ministry of Finance
b.
Ministry of Electronics & Information Technology
c.
Ministry of Corporate Affairs
d.
Ministry of Science & Technology
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Q89 mcq
The resistance of a metal rod depends on all of the following, EXCEPT . resistivity 4
a.
resistivity
b.
density
c.
length
d.
temperature
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Q90 mcq
If the amount received at the end of Ist and 2nd year at compound interest on a certain principal is = 1,350 and = 1,458 respectively, what is the rate of interest? 4 10%
a.
10%
b.
15%
c.
12%
d.
8%
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Q91 mcq
Find the efficiency of a pulley system which has a mechanical advantage of 2.5 and where the load lifts by 2.5 meters on pulling the rope by 10 m. VW 62.50%
a.
62.50%
b.
25.00%
c.
40.00%
d.
100.00%
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Q92 mcq
is when we cover a surface with a pattern of flat shapes so that there are no overlaps or gaps. Tessellation VW
a.
Tessellation
b.
Tracking
c.
Gradient
d.
Kerning
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Q93 mcq
Find x if the mean of the numbers 10, 4, 1, 15, 15, x, 12 and 14 is 10. 4 T
a.
T
b.
8
c.
9
d.
10
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Q94 mcq
Only conclusion I follows 4
a.
Only conclusion I follows
b.
Both I and II follow
c.
Neither I nor II follows
d.
Only conclusion II follows
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Q95 mcq
If VX + 0.24 = V0.1296, then find X. VW 0.0144
a.
0.0144
b.
0.12
c.
1.44
d.
0.0012
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Q96 mcq
Which of the following recipients of the Dadasaheb Phalke Award received it posthumously? Vinod Khanna VW
a.
Vinod Khanna
b.
Satyajit Ray
c.
‘Naushad
d.
Durga Khote
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Q97 mcq
A said to B, "You are my husband's daughter-in-law's son." How is B related to A? B is the father of A 4
a.
B is the father of A
b.
B is the grandson of A
c.
B is the brother of A
d.
Bis the son of A
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Q98 mcq
4 500%
a.
500%
b.
20%
c.
400%
d.
25% %
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Q99 mcq
curves employ at least three points to define a curve. The two endpoints of the curve are called anchor points. The other points, which define the shape of the curve, are called handles, tangent points, or nodes. Bicorn 4
a.
Bicorn
b.
Bezier
c.
Deltoid
d.
Kappa
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Q100 mcq
00
a.
14
b.
21
c.
17
d.
18
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Q101 mcq
Capillary tube is the expansion valve used in refrigeration and Air Conditioning units With more than 10 ton cooling capacity 4
a.
With more than 10 ton cooling capacity
b.
With less than 3 ton cooling capacity
c.
With more than 3 ton cooling capacity
d.
With less than 10 ton cooling capacity
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Q102 mcq
After AC installation, how should one check for the performance? Run unit for a minimum of 05 - 10 minutes 4
a.
Run unit for a minimum of 05 - 10 minutes
b.
Run unit for a minimum of 10- 15 minutes
c.
Run unit for a minimum of 0 - 05 minutes
d.
Run unit for a minimum of 20-25 minutes
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Q103 mcq
a.
“T™ Joint
b.
Britannia joint
c.
‘Wester union joint
d.
Straight joint
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Q104 mcq
Convert 2-Ton refrigeration to horsepower (metric). VW 9.56
a.
9.56
b.
7.46
c.
8.97
d.
6.47
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Q105 mcq
Improper flaring is directly related with. Leakage of refrigerant VW
a.
Leakage of refrigerant
b.
Saving money
c.
Appearance
d.
Longevity of equipment
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Q106 mcq
Ina multi split AC system ‘You can set different temperatures for different rooms VW
a.
‘You can set different temperatures for different rooms
b.
Temperature controls are installed in each room
c.
‘You cannot set different temperatures for different rooms
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Q107 mcq
What is the purpose of Taper reamer? To finish parallel hole 4
a.
To finish parallel hole
b.
To finish taper hole
c.
To finish irregular hole
d.
To finish square hole
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Q108 mcq
Which type of file is suitable to file right angle finish corner? Round file 4
a.
Round file
b.
Square file
c.
Safe edge file
d.
Triangular file
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Q109 mcq
How the OLP is connected with Refrigeration circuit of a refrigerator? Parallel with Running & Starting 4
a.
Parallel with Running & Starting
b.
Series with Common winding
c.
Series with Running winding
d.
Series with Starting winding
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Q110 mcq
When retrofitting a CFC-12 system to an HFC-134a system, Which two items must be installed or replaced? Fitting adaptors and the drier 4
a.
Fitting adaptors and the drier
b.
Compressor and O-rings
c.
Label and the condenser
d.
Fitting adaptors and a label
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Q111 mcq
Which rays are produced during welding? X-rays 4
a.
X-rays
b.
Gamma rays
c.
Ultraviolet rays
d.
Microwaves rays
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Q112 mcq
A spring bender is used for bending the copper tube VW
a.
bending the copper tube
b.
swaging the copper tube
c.
flaring the copper tube
d.
straightening the copper tube
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Q113 mcq
Which type of relay is used with window type air conditioner? Potential relay 4
a.
Potential relay
b.
PTCR
c.
PTC
d.
Electromagnetic relay
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Q114 mcq
a.
Scroll
b.
Rotary
c.
Centrifugal
d.
Absorption
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Q115 mcq
Which is NOT the cause of weak airflow in CAR AC? 4
b.
Low air velocity outside car.
c.
Ventilation fan is not blowing air.
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Q116 mcq
What is the use of a tap? Cleaning external thread 4
a.
Cleaning external thread
b.
Forming external thread
c.
Forming internal thread
d.
Forming thread on nipple
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Q117 mcq
The domestic refrigerator uses following type of compressor. Piston type reciprocating VW
a.
Piston type reciprocating
b.
Axial
c.
Centrifugal
d.
Miniature sealed unit
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Q118 mcq
What will be the value of 18SWG in millimeters? 4 1.34mm
a.
1.34mm
b.
1.14mm
c.
1.44 mm
d.
1.24mm
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Q119 mcq
What is the colour of Argon cylinder? 4 Maroon
a.
Maroon
b.
‘Yellow shoulder
c.
Dark green shoulder
d.
Grey shoulder
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Q120 mcq
What is the outcome of having a straight copper pipe fitting in refrigeration cycle? Pressure will increase 4
a.
Pressure will increase
b.
Pressure will NOT drop
c.
Pressure keeps fluctuating
d.
Pressure will decrease
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Q121 mcq
Which type of expansion device is used for MAC? Orifice expansion valve 4
a.
Orifice expansion valve
b.
Automatic expansion valve
c.
Thermal expansion valve
d.
Capillary tube type
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Q122 mcq
What is the use of Thermo-Volume Switch? Engaging / disengaging magnetic clutch 4
a.
Engaging / disengaging magnetic clutch
b.
Controlling fan speed
c.
Setting cooling range for thermostat
d.
Controlling air flow
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Q123 mcq
Which is NOT a Common Car Air Conditioning System Problem? Moisture deposition 4
a.
Moisture deposition
b.
Soiled or clogged Condenser
c.
Pungent Odors
d.
Engine backfiring
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Q124 mcq
What will be the temperature of single door refrigerator’s freezer box? aes Bt a a 4
a.
aes Bt a a
b.
tian et
c.
ee
d.
oars Daan a
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Q125 mcq
Which type of snip is suitable to cut curved surfaces? Bent snip VW
a.
Bent snip
b.
Scissor type snip
c.
Aviation snip
d.
Straight snip
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Q126 mcq
Freon group of refrigerant are Nontoxic and non-inflammable 4
a.
Nontoxic and non-inflammable
b.
Toxic and non-inflammable
c.
Toxic and inflammable
d.
Nontoxic and inflammable
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Q127 mcq
Which lubricants are used with HFC and their blends? Mixture of synthetic and mineral oils 4
a.
Mixture of synthetic and mineral oils
b.
Mineral oil
c.
Synthetic oil
d.
Coconut oil
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Q128 mcq
In window type air conditioner, thermostat is fixed between . Selector switch and OLP VW
a.
Selector switch and OLP
b.
Relay and OLP
c.
Running winding and Condenser fan
d.
Relay and Winding
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Q129 mcq
Where is a Cassette A/C indoor unit installed? Near a window of the room 4
a.
Near a window of the room
b.
Floor of the room
c.
Wall of the room
d.
Roof of the room
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Q130 mcq
Direct On Line starter used with motor is : 4 11-50 HP
a.
11-50 HP
b.
Above 70 HP
c.
51-69 HP
d.
0-10HP
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Q131 mcq
Which refrigerant is newly introduced to replace R - 22? 4 R-510D
a.
R-510D
b.
R-507C
c.
R-410A
d.
R-410C
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Q132 mcq
Which type of welding is indicated with this symbol? Fillet VW
a.
Fillet
b.
Spot
c.
Plug or slot
d.
Seam
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Q133 mcq
What is the relation between voltage and ampere? V=I4R 4
a.
V=I4R
b.
V=!I
c.
V=IR
d.
woud =
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Q134 mcq
Gas welding is also known as: Fuel welding 4
a.
Fuel welding
b.
Oxy fuel gas welding
c.
Are welding
d.
Metallic welding
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Q135 mcq
nna sue Drive slip is used to construct a 5 Tray 4
a.
Tray
b.
Funnel
c.
Duct
d.
Bucket
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Q136 mcq
In an Air conditioning system, the vacuum pump is required to create a vacuum state of. : 1,200 microns 4
a.
1,200 microns
b.
500 microns
c.
4,500 microns
d.
1,500 microns
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Q137 mcq
How is the condensed water drained from a cassette unit? Siphon method 4
a.
Siphon method
b.
Condensation method
c.
Gravitational method
d.
Pumping method
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Q138 mcq
A cooling tower reduces water temperature close to: Saturation temperature 4
a.
Saturation temperature
b.
‘Wet bulb temperature
c.
Dew point temperature
d.
Dry bulb temperature
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Q139 mcq
The moisture in refrigerant is removed by Evaporator 4
a.
Evaporator
b.
Dehumidifier
c.
Expansion valve
d.
Drier
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Q140 mcq
Aqua ammonia is used as refrigerant in following type of refrigeration system. Absorption VW
a.
Absorption
b.
Indirect
c.
Direct
d.
Compression
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Q141 mcq
What type of condenser is used in chest type deep freezer? Forced, air cooled VW
a.
Forced, air cooled
b.
‘Water cooled
c.
‘Natural convention type
d.
Air and water cooled
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Q142 mcq
An expansion valve is fitted in the refrigeration unit. After the evaporator 4
a.
After the evaporator
b.
Before the condenser
c.
Before the evaporator
d.
Before the compressor
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Q143 mcq
Heat transfer is faster in : Radiation VW
a.
Radiation
b.
Convection
c.
Conduction
d.
Isolation
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Q144 mcq
Condenser in a refrigeration system decreases Volume only 4
a.
Volume only
b.
Pressure only
c.
Temperature and pressure
d.
Temperature only
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Q145 mcq
Ina split AC VW
d.
Compressor in the AC installed on the unit itself
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Q146 mcq
What is the low-pressure switch range? Cut On 4.1 + 0.3 Kg/ cm’, Off 7.0 + 0.2 Kg/ em? 4
a.
Cut On 4.1 + 0.3 Kg/ cm’, Off 7.0 + 0.2 Kg/ em?
b.
Cut On 2.1 + 0.3 Kg/cm?, Off 2.0 + 0.2 Kg/ em?
c.
Cut out : On 36 + 3.0, Kg/ cm? Off 30 + 2.0 Kg/ cm?
d.
Cut out : On 26 + 3.0, Kg/ cm? Off 32 + 2.0 Kg/ cm?
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Q147 mcq
Which of the following refrigerant is replaced in retrofitting? VW CFC-11
a.
CFC-11
b.
R-401A
c.
HFC-134a
d.
HCFC-22
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Q148 mcq
Most of the chances of leakage in a split air conditioner are from Compressor outer case joint 4
a.
Compressor outer case joint
b.
Swage joint
c.
Processing tube joint
d.
Flare joint
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Q149 mcq
Which is the best way of checking leak of split A/C condenser installed unit? With electronic leak detector VW
a.
With electronic leak detector
b.
Dipping in water tub
c.
Hearing hissing sound
d.
Smelling
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Q150 mcq
Domestic refrigerators working on vapor compression cycle uses following type of expansion device. Expansion valve 4
a.
Expansion valve
b.
Thermostatic valve
c.
Capillary tube
d.
Electrically operated throttling valve
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Q151 mcq
What type of relay fits with DOL starter? Mechanical relay VW
a.
Mechanical relay
b.
Electronic relay
c.
Magnetic relay
d.
Electromagnetic relay
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Q152 mcq
De-scaling of condenser is the process of cleaning. Oil 4
a.
Oil
b.
Chemical
c.
Water
d.
OFDN
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Q153 mcq
The location of the expansion device in a refrigeration cycle is between the and : Receiver ; Evaporator VW
a.
Receiver ; Evaporator
b.
Condenser ; Receiver
c.
Evaporator : Compressor
d.
Compressor : Condenser
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Q154 mcq
Which procedure of charging is recommended for better performance of an air conditioning system? Feeling method 4
a.
Feeling method
b.
Pressure method
c.
Charge still method
d.
Weighing method
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Q155 mcq
Thermal resistance of an ideal conductor would be 4 one
a.
one
b.
hundred
c.
‘zero
d.
ten
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Q156 mcq
Due to the absorption of heat by evaporator, the refrigerant converts into : saturated vapour VW
a.
saturated vapour
b.
liquid
c.
sub cooled liquid
d.
saturated liquid
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Q157 mcq
Which is NOT the type of leak test for an air conditioner? Dye testing for refrigerant leak 4
a.
Dye testing for refrigerant leak
b.
Nitrogen leak detector test and bubble test
c.
Magnetic leak detector test
d.
Electronic leak detector test
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Q158 mcq
Which type of compressor is used for domestic air conditioner? Hermetically sealed VW
a.
Hermetically sealed
b.
Belt drive compressor
c.
Semi sealed
d.
Open type
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Q159 mcq
What is the value of one calorie? 1.32 Joule 4
a.
1.32 Joule
b.
4.2 Joule
c.
3.2 Joule
d.
2.34 Joule
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Q160 mcq
What is the use of Heat limiter in water dispenser? To maintain cold water temperature 4
a.
To maintain cold water temperature
b.
To maintain normal temperature
c.
To mix hot and cold water in the vessel
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Q161 mcq
Forced air-cooled condenser fins are made up of | Steel 4
a.
Steel
b.
Zine
c.
Brass
d.
Aluminium
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Q162 mcq
What is the purpose of an idler pulley? Rotating freely with engine 4
a.
Rotating freely with engine
b.
Engaging magnetic clutch
c.
Preventing slack in the belt
d.
Transmitting power from driver to driven
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Q163 mcq
In a Hermetic sealed compressor 4
d.
Only motor is confined in a single outer welded steel shell
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Q164 mcq
What is the use of Diamond point chisel? Chipping on metal surfaces 4
a.
Chipping on metal surfaces
b.
Forming square groove on metal surfaces
c.
Forming “V" groove on metal surfaces
d.
Forming semi-circle groove on metal surfaces
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Q165 mcq
The inner core of the flame in gas welding has temperature lowest 4
a.
lowest
b.
medium
c.
100°C
d.
highest
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Q166 mcq
If the diameter of a wire increase then its resistance : fluctuates 4
a.
fluctuates
b.
increases
c.
decreases
d.
remains the same
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Q167 mcq
How much swag length is recommended to join copper pipes of the same diameter? Diameter + 1 mm 4
a.
Diameter + 1 mm
b.
Diameter + 3mm
c.
Diameter + 15mm
d.
Diameter + 10mm
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Q168 mcq
a.
Water and air cooled
b.
‘Water cooled
c.
Oil cooled
d.
Air cooled
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Q169 mcq
What is the full form of SCR? Serum Controlled Rectifier 4
a.
Serum Controlled Rectifier
b.
Self- Controlled Rectifier
c.
Satisfied Controlled Rectifier
d.
Silicon Controlled Rectifier
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Q170 mcq
wires have the highest resistance. Extra large diameter 4
a.
Extra large diameter
b.
Thick
c.
Thin
d.
Medium
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Q171 mcq
Squirrel cage induction motor has Very small starting torque VW
a.
Very small starting torque
b.
Very high starting torque
c.
Medium starting torque
d.
Zero starting torque
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Q172 mcq
Which is NOT the function of receiver drier in an A/C? To trap contaminants that may be inside the A/C system. 4
a.
To trap contaminants that may be inside the A/C system.
b.
To receive the air and dry the Ice
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Q173 mcq
What is the full form of UST in transistors? Universal Junction Transistor 4
a.
Universal Junction Transistor
b.
Uni- Junction Transistor
c.
Union Junction Transistor
d.
Uniform Junction Transistor
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Q174 mcq
Where does higher temperature occur in a vapour compression cycle? Receiver 4
a.
Receiver
b.
Evaporator
c.
Expansion valve
d.
Compressor discharge
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Q175 mcq
What should NOT be done in An air conditioning performance test? Place a thermometer in the inside air inlet door VW
a.
Place a thermometer in the inside air inlet door
b.
Open the doors
c.
Turn blower to high speed
d.
Set the controls for maximum cooling
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