| Post Name | Refrigeration Mechanic - Apex Societies of Co-operative Sector in Kerala/ MATSYAFED |
|---|---|
| Question Paper Code | 039/2022 |
| Category Code | 214/2020, 215/2020 |
| Date of Test | 11 April 2022 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The three factors that must be present in combination for a fire to continue to burn are :
Answer
A. fuel , heat, oxygen
2
Fires are classified into :
Answer
D. four types
3
A vernier caliper is a precision measuring instrument it is used to measure upto an accuracy
of :
Answer
B. 0.02 mm
4
Taps are used for :
Answer
C. cutting internal threads
5
Which file is used for filing soft metals like brass, aluminium, bronze and copper :
Answer
D. rasp cut file
6
What thickness of metal sheets are called as plates?
Answer
A. sheets over 5 mm
7
Specify the thickness of a sheet metal having 24 SWG (Standard Wire Gauge) :
Answer
C. 0.56 mm
8
What is the storage volume
Answer
D. 7 m3
A 3
9
What is the pressure Inside the Acetylene cylinder?
Answer
C. 15-16 kg/cm2
10
The Ammeter is used in :
Answer
D. series connection
11
The same current passes through each resistance in
Answer
B. series circuit
12
Which law relates voltage, current and resistance of a circuit?
Answer
B. Ohm’s law
13
Which one is the three phase AC motor used in refrigerating machines?
Answer
D. slip ring induction motor
14
Which is the revolving part of single phase motor?
Answer
A. rotor
15
The starting torque of a capacitor start motor is :
Answer
C. more than rated torque
16
The over load release protects the motor against :
Answer
Question Cancelled
17
If a humming and chattering noise is observed in the starter then check for the :
Answer
C. rated voltage
18
The diode used for voltage regulation is :
Answer
B. zener diode
19
How many diodes are required to form a bridge rectifier?
Answer
A. 4
20
In a refrigeration system which is used as heat transfering medium?
Answer
C. Refrigerant
21
Which refrigerant absorb only sensible heat?
Answer
A. Secondary refrigerant
22
Which is react with ozone and changes it into oxygen?
Answer
B. Chlorine
23
The desirable quantity of a refrigerant :
Answer
Question Cancelled
24
HC blend refrigerant is :
Answer
Question Cancelled
25
Refrigerant -500 is :
Answer
Question Cancelled
26
An ozone friendly refrigerant is :
Answer
A. Hydro fluorocarbon
27
G.W.P means :
Answer
C. Global warming potential
28
Which is saturated carbon compound?
Answer
D. Propelene
29
It is the process of replacing of a refrigerant from the system with another refrigerant :
Answer
A. Retrofitting
30
In a psycrometric chart the horizontal line indicates :
Answer
D. None of these
31
A clamp meter is used to detect :
Answer
D. All of these
32
Hygrometer is used to measure :
Answer
C. Humidity
33
Dew point depression is :
Answer
A. Difference between dry bulb temperature and dew point temperature
34
Which one of the following have eliminators and spray nozzles?
Answer
B. Air washer
35
During winter season which one of the following should be controlled with temperature in an
air conditioning system?
Answer
D. Humidity
36
In a comfortable AC system the relative humidity should be :
Answer
Question Cancelled
37
Which is a psychrometric process?
Answer
C. Sensible cooling
38
A device which is used to decrease moisture from an air conditioning system :
Answer
Question Cancelled
39
An instrument used to measure air velocity :
Answer
A. Anemometer
40
Heat increases :
Answer
Question Cancelled
41
Standard atmospheric pressure :
Answer
C. 14.75 Pound/square inch
42
Rectifier is a part of refrigeration system :
Answer
B. Absorption
43
In HVAC, “V” represents :
Answer
D. Ventilation
44
Timer and heating coil is used with :
Answer
B. Frost free refrigerator
45
‘TON’ of refrigeration is based on :
Answer
D. Melting of 2000 pounds of ice
46
The term drift related with cooling tower means :
Answer
D. Loss of water
47
One of the advantages of heat exchanger in conventional type refrigerator is :
Answer
A. prevent wet compression
48
Hydrocarbon gas charging should be done :
Answer
D. Weight
49
The weight of refrigerant for a cylinder can be calculated by the following correct formula is :
Answer
B. M =V ×d
50
When moisture is present in refrigerant, it can lead to the formation of :
Answer
A. Hydrochloric acid
51
Which refrigerant is suitable for domestic refrigerator?
Answer
C. HC blend
52
The Liquid refrigerant is purified filter drier and enters to the :
Answer
C. Capillary tube
53
The defrost refrigerator is an electric heater attached to the evaporator controlled by :
Answer
A. Timer switch
54
The condenser fins of refrigerator should be cleaned by :
Answer
B. Painting brush
55
Which type of compressor motor is used in inverter refrigerator?
Answer
D. BLDC
56
In refrigerator compressor keeps the working continuously, what is the reason of its defect :
Answer
C. Thermostat switch
57
The capacity of water cooler is expressed in :
Answer
A. liters
58
Recently which type of insulation material is used in water cooler :
Answer
B. Poly urethene form
59
Which of the following insulating material does not absorb moisture in air due to the
Environment?
Answer
B. Fibre glass
60
The melting temperature of Tin an Lead is :
Answer
D. 232 degree Celsius and 327 degree Celsius
61
In working Deep freezer if the voltage drops, the compressor will be stopped by :
Answer
D. Overload protector
62
The kind of wiring will be in small capacity of Defreezer are :
Answer
C. RSIR
63
Accumulation of ice in a defreezer can be diagonised by :
Answer
B. Cold spot on the outside surface
64
What happens if air present in ice?
Answer
D. Milky white ice is obtained
65
Name the instrument used to check the air velocity in window air conditioner :
Answer
B. Anemometer
66
Select the physical condition of a filter/drier in a split ac unit if it is clogged :
Answer
A. Cool
67
The condensing unit kept closer to the split ac unit in order to reduce :
Answer
B. Pressure drop
68
The split ac which contains one out door and more than indoor unit is known as :
Answer
C. Multi split A/C
69
The outer unit of split A/C fan motor have single shaft with a capacity of :
Answer
B. 1/5 HP at 220 V
70
The recommended vacuum level of split A/C unit should be :
Answer
C. 150 microns/30 inches of Hg
71
The cooling capacity of 1.5 Ton ductable split A/C is :
Answer
D. 18000 Btu/ hour
72
Split A/C condensing unit should be installed at :
Answer
C. Free air area
73
Which type of cooling coil is used in defreezer Commonly?
Answer
Question Cancelled
74
Floor level of bottle cooler to be checked by :
Answer
A. Using spirit level
75
All types of yeast will be destroyed when subjected to a temperature of :
Answer
C. 100°C
76
The process of freeze-drying is also known as :
Answer
A. Dehydration by sublimation
77
For unsaturated air :
Answer
A. D.B.T is greater than W.B.T
78
Damper is used in Air conditioning plant for :
Answer
B. Controlling the flow of air
79
The process of cooling a liquid below its saturation temperature is called :
Answer
D. Sub cooling
80
What is the cause of high suction pressure and low discharge pressure of the compresser in
ice plant?
Answer
A. Compressor pumping is poor
81
What is meant by hydronic system?
Answer
C. Water distribution system in HVAC
82
Which of the following types of filters used in the air conditioning system is made of cloth
that is discarded on getting dirty?
Answer
D. Dry filter
83
Aspect ratio in rectangular duct should be kept within :
Answer
A. 4:1
84
Which refrigerant is used in ice candy plant?
Answer
C. R134a
85
Which process increases the specific humidity of air at constant dry bulb temperature?
Answer
A. Humidification of air
86
Which instrument is used to measure the total pressure in an air duct?
Answer
B. Pitot tube manometer
87
The air which is filtered by electronic fitter, is passed from :
Answer
A. Electrostatic field
88
———— is the preservation of food in sealed containers, usually after the application of
heat.
Answer
D. Canning
89
———— type expansion valve is used in Railway air-conditioning system.
Answer
B. Thermostatic
90
What is the purpose of adding dye to the car AC system?
Answer
C. Identify the gas leak
91
What is the reason for Ice accumulating in drain pan of walk-in cooler?
Answer
D. Defective heater
92
Which method prevents the foul smell of drainage entering the AHU?
Answer
A. U-trap
93
What is the other name of absolute filter?
Answer
B. HEPA filter
94
The axial flow fans are particularly suitable for handling :
Answer
C. large volumes of air at relatively low pressures
95
Which control terminals are shorted before pump down operation in split package AC?
Answer
B. Low pressure switch
96
Which is scheduled for yearly maintenance in package AC?
Answer
A. Clean the cooling tower
97
Which device is used to measure the density of brine solution?
Answer
B. Hydrometer
98
What is the function of magnetic clutch in an automobile air conditioner?
Answer
A. Start and stop the compressor electro magnetically
99
Which process decreases the dry bulb temperature of air at constant specific humidity?
Answer
D. Sensible cooling of air
100
What is the reason for short cycling of LP control switch in AC plant?
Answer
C. Shortage of refrigerant
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