| Post Name | A/C MECHANIC- KTDC |
|---|---|
| Department | KTDC |
| Question Paper Code | 132/2017 |
| Date of Test | 13 November 2017 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Eastern most point of India is ___________
Answer
D. Kibithu
2
___________ is the only Indian State through which the Indus flows
Answer
A. Jammu Kashmir
3
The coldest place in India is ___________
Answer
A. Drass Valley
4
North-east monsoon is commonly known as
Answer
B. October heat
5
Red colour of the ‘red soil’ is due to the high concentration of ___________
Answer
C. Iron oxide
6
Egg bowl of India is ___________
Answer
C. Andhra Pradesh
7
Who is the Father of Indus Economics ?
Answer
A. Dadabhai Naoroji
8
First Five Year Plan gave priority to ___________
Answer
C. Agricultural Development
9
The first session of Swaraj Party was held at
Answer
B. Allahabad
10
Ancient University named ‘Kandallursala’ situated in
Answer
C. Thiruvananthapuram
11
The first floating ATM in Kerala is started in
Answer
B. Thiruvananthapuram
12
Almost 68% of the total area of Kerala is ___________ soil group
Answer
A. laterite
13
Which river in Kerala is known as ‘Baris’ in ancient days ?
Answer
A. Pamba
14
Who is known as ‘Father of Modern Kerala Renaissance’ ?
Answer
A. Sri Narayana Guru
15
Who called Ayyankali as ‘Pulayaraja’ ?
Answer
C. Mahatma Gandhi
16
Who is the returning officer for the election to Vice President of India ?
Answer
C. Secretary Lok Sabha / Rajya Sabha
17
World Athletic meet 2017 take place at
Answer
A. London
18
Who is the French President ?
Answer
B. Emmanuel Mucro
19
In which year Olympics will take place in Los Angeles for the third time ?
Answer
B. 2028
20
Who is the Vice President of India ?
Answer
C. Venkaiyya Naidu
21
What thickness of metal sheets are called as plates ?
Answer
B. Above 5 mm
22
What gases are used for the application under water gas cutting of steel ?
Answer
C. Oxygen-Hydrogen
23
In which gas welding technique the blow pipe and filler rod angles are 50 and 40 respectively with the welding line ?
Answer
A. Rightward
24
Soldering & Brazing are the example of non-fusion welding
Answer
B. Non-fusion welding
25
Which type of artificial respiration method must not be used for the victim has injuries to the chest and belly ?
Answer
C. Nelson’s arm – lift back – pressure method
26
Metering device used in car air-conditioner
Answer
D. Thermostatic expansion valve
27
VRV stands for _________
Answer
B. Variable Refrigerant Volume
28
The package AC comes in capacity _________
Answer
C. between 5 to 15 TR
29
Rawl plug tool is used for making _________
Answer
D. Hole A 5
30
Commercial reciprocating compressor lubricated by
Answer
A. Forced feed
31
Centrifugal switch disconnected after the rotor has reached _________ of the rated speed
Answer
D. 75 to 80%
32
Why is three phase induction motor self starting ?
Answer
D. phase angle difference 120°
33
Standard atmospheric pressure is
Answer
A. 1.0332 kg f/sq.cm
34
Chemical formulae of R-600 a
Answer
D. C4H10
35
What is general chemical formula for finding Refrigerant Numbering ?
Answer
B. CmHnClpFq and n + p + q = 2m + 2
36
What is the colour code of Refrigerant 410 A ?
Answer
A. Rose
37
The various methods of duct design are _________
Answer
D. All of these 6 A
38
‘HEPA’ stands for _________
Answer
B. High Efficiency Particulate Air
39
As the engine speed decreases, the cooling capacity of the car AC system _________
Answer
C. decreases
40
Refrigerant 407 C is combination of _________
Answer
D. R-32, R-125 & R-134a
41
What is temperature of Neutral flame in Oxy-Acetylene Brazing set ?
Answer
B. 3200 °C
42
1 micron = _________ millimetre of Hg
Answer
B. 1/1000
43
Azeotropic Mixtures are designed by _________ series
Answer
A. 500
44
How are the reciprocating compressor classified depending on working ?
Answer
B. Single & Double acting
45
GWP of R-11 is
Answer
A. 8500
46
How much air is normally required for the working of air-cooled condenser per ton of refrigeration ?
Answer
B. 30 to 35 cu.m/min
47
The thermistors are _________
Answer
C. resistance type temperature sensors
48
What are the examples of non-fusion welding ?
Answer
C. Soldering
49
Alternative refrigerant of R-22
Answer
B. R-410 A
50
Voltage rating of starting capacitor used in ACs
Answer
B. 230 V
51
50 °F is _________
Answer
D. 10 °C
52
What is a Rectifier ?
Answer
B. AC to DC converter
53
What is the voltage required for LED ?
Answer
A. 1.2 – 2.5 V
54
How many diodes are there in a bridge rectifier ?
Answer
C. 4
55
Which is the semi-conductor device with three terminals and used for amplifying electric and electronic signals ?
Answer
B. Transistor
56
What type of relay is used in RSIR ?
Answer
D. Current coil relay
57
The vapour pressure of refrigerant should be
Answer
B. higher than atmospheric pressure
58
One of the purposes of sub-cooling the liquid refrigerant is to
Answer
D. ensure that only liquid and not the vapour enters the expansion valve
59
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
Answer
B. increases
60
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made up of
Answer
B. Steel
61
The higher temperature in vapour compression cycle occurs at __________
Answer
D. Compressor discharge A 9
62
Latent heat of vaporization at 5 °F (Btu/lb) of R-134 a is __________
Answer
D. 89.3
63
The weight of HC charged to the system for drop in conversion from CFC 12 to HC is
Answer
D. 40%
64
Most of the refrigerants including CFCs, HCFcs, HFCs and HC blend are __________
Answer
A. Non-toxic
65
A refrigerant recovery unit needs the filter drier change, approximately after __________
Answer
B. 100 hours of operation
66
The clearance between rotor and stator varies according to the __________
Answer
D. Size of the motor
67
The ball bearing of electrical motor are lubricated by __________
Answer
B. Grease
68
Which causes clogging at the expansion valve ?
Answer
C. Moisture
69
The reason for the thermostat switch to become defective is __________
Answer
C. Carbon formation of contact points
70
High pressure cut off is used to __________
Answer
B. cut off power supply to compressor motor if pressure increases beyond the preset value
71
Air velocity is measured by __________
Answer
B. Anemometer
72
The solenoid valve operated by __________
Answer
D. Electrically operated
73
Brine solution circulation pump consists of __________
Answer
D. Rotating vane type impeller
74
A water cooler is having 4 kg (weight) quantity of R-12, if you retrofit with HFC for the same machine. How much quantity is weight of 134a you will charge ?
Answer
A. 3.8 kgs
75
Ice cream storage plant thermostat thermal bulb is located ________
Answer
D. in brine solution
76
The function of duct in air conditioning unit is _________
Answer
D. Air distributing A 11
77
A cooling tower’s warm water inlet temperature is 44 °C, sump water outlet temperature is 32 °C, surrounding air wet bulb temperature is 24 °C. Find out the efficiency of the cooling tower in percentage
Answer
A. 60%
78
The cut-in and cut-out set pressure difference is called
Answer
B. differential pressure
79
Compressor motor protected by the ___________
Answer
B. overload protector
80
The purified, conditioned air improves the ___________
Answer
C. Performance of the system
81
Which instrument is used to measure relative humidity ?
Answer
B. Psychrometer
82
What is the purity of dry nitrogen for flushing ?
Answer
C. 3 ppm
83
By using which valve in the charging line, the refrigerant can be recovered ?
Answer
C. Piercing valve
84
The relationship between rotor speed ‘N’, frequency ‘f’ and number of poles ‘p’ is given by relation
Answer
A. N = 120 f/p
85
A oil separator is necessary in discharge line to return the oil to the compressor in case of ______
Answer
B. R-717
86
An evaporative condenser is a _________
Answer
C. Both air and water cooled at the same time
87
Approach of a cooling tower is defined as the
Answer
C. difference of temperature of water leaving the cooling tower and temperature of water entering the cooling tower
88
In a induced draft cooling tower, the fan is fixed at the _________
Answer
A. top of the cooling tower
89
A thermostatic expansion valve is based on the principle of maintaining a constant degree of superheat at the _________
Answer
D. exit of evaporator
90
The eliminators at the air washers avoid the
Answer
B. Water particles in the air
91
External equalizer is used with _________
Answer
B. TEV
92
Normally pressure relief valves are mounted on _________ in a refrigeration plant
Answer
B. receiver
93
The best refrigerant is one for which _________
Answer
D. ODP = 0
94
Relative COP = _________
Answer
A. Actual COP / Theoretical COP
95
The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called
Answer
A. Sub-cooling
96
On P-H diagram, the isentropic compression process is represented by an
Answer
D. Curved line
97
The super-heating in a refrigeration cycle
Answer
C. Decrease COP
98
How many numbers of orbits in the orbiting scroll of scroll compression process ?
Answer
B. Four
99
Most air cooled condensers are designed to operate with a temperature difference of
Answer
C. 14 °C
100
The centrifugal compressor are generally used for refrigerants that require
Answer
D. large displacements and low condensing pressure. ____________ 14 A
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