Quiz Questions

ITI Quiz - 02-Mar-2026 01:08 PM (ITISKILL3307YZ)

Q-Paper A-Paper
Question 1 1 Marks
Which component defrosts in frost free refrigerator?
A
Bulb
B
Heater
C
Thermostat
D
Capillary tube
Question 2 1 Marks
What is the advantage of sealed system compared to open type system?
A
Mechanical efficiency is greater
B
Cylinder lubrication is easier
C
Any refrigerant can be used
D
No shaft seal is required
Question 3 1 Marks
What is the effect of contamination in refrigeration system?
A
High heating
B
Poor cooling
C
Low pressure
D
Low humidity
Question 4 1 Marks
Which device equalizes the system pressure in frost free refrigerator?
A
Capillary tube
B
Compressor
C
Condenser
D
Evaporator
Question 5 1 Marks
Which sheet is used to check the tigtness of door gasket of a refrigerator?
A
Rubber
B
Plastic
C
Copper
D
Zinc
Question 6 1 Marks
Which component actuates the defrost cycle in frost free refrigerator?
A
Bimetal thermo
B
Defrost heater
C
Timer
D
Relay
Question 7 1 Marks
Which is used to clean the condenser fins of a refrigerator?
A
Painting brush
B
Diluted acid
C
Soap solution
D
Fin comb
Question 8 1 Marks
Which component is turned off while defrost heater is energised?
A
Cabinet bulb
B
Evaporator fan
C
Thermostat sensor
D
Over load protector
Question 9 1 Marks
Which device protects the compressor motor from drawing more current?
A
OLP
B
Relay
C
Thermostat
D
Door switch
Question 10 1 Marks
Why frost free model refrigerator takes less freezing time of products?
A
Forced air circulation
B
Natural air circulation
C
Low temperature setting
D
High temperature setting
Question 11 1 Marks
Which electrical control cuts off heating element in frost free refrigerator?
A
Bimetal thermo
B
Thermostat
C
Relay
D
Timer
Question 12 1 Marks
Which is connected in series with start capacior in motor circuit?
A
Starting winding
B
Common terminal
C
Running Terminal
D
Running winding
Question 13 1 Marks
What is the cut out temperature of bimetal thermo in frost free refrigerator?
A
5 Degree Centigrade
B
10 Degree Centigrade
C
20 Degree Centigrade
D
25 Degree Centigrade
Question 14 1 Marks
What is the cause for refrigerator door gap at closing position?
A
Uneven floor level
B
Either side gap more
C
Either side gap less
D
Uneven condenser level
Question 15 1 Marks
Where the manually defrosted water is stored in refrigerator?
A
Tray on top of the compressor
B
Bottom of the evaporator
C
Bottom of the condenser
D
Top of the freezer
Question 16 1 Marks
What is the reason if refrigerator runs normally but no cooling effect?
A
Leakage of refrigerant
B
Condenser block
C
Filter block
D
Over charge
Question 17 1 Marks
What is the temperature maintained in the refrigerator freezer?
A
0 Degree Centigrade
B
- 15 Degree Centigrade
C
- 45 Degree Centigrade
D
- 65 Degree Centigrade
Question 18 1 Marks
Which movement of plunger energises the start winding in relay operation?
A
Vertically up
B
Bottom side
C
Vertically down
D
Horizontally left
Question 19 1 Marks
Which component is used in frost free refrigerator?
A
Plate coil evaporator
B
Liquid receiver
C
Oil separator
D
Timer switch
Question 20 1 Marks
What is the working condition of component during defrost cycle in frost free refrigerator?
A
Evaporator fan motor is running
B
Compressor is not running
C
Thermostat cuts off
D
Relay activated
Question 21 1 Marks
Which component switches ON/OFF the starting winding in RSIR motor?
A
Thermostat
B
Capacitor
C
Relay
D
OLP
Question 22 1 Marks
Where the thermal bulb is fixed in frost free refrigerator?
A
Liquid line
B
Discharge line
C
Last coil of condenser
D
Last coil of evaporator
Question 23 1 Marks
Which method of refrigeration system is adopted in frost free refrigerator?
A
Vapour compression
B
Vapour absorption
C
Water vapour
D
Evacuating
Question 24 1 Marks
What is the effect of bimetal thermo stucks in ON position in frost free refrigerator?
A
Accumulation of frost
B
More cooling
C
Poor cooling
D
No cooling
Question 25 1 Marks
Which component is replaced to prevent air entering the refrigerator cabinet?
A
Thermostat
B
Door gasket
C
Door paint
D
Door hinges
Question 26 1 Marks
Which two tubes act as heat exchanger in a refrigerator?
A
Suction and charging tube
B
Discharge and suction tube
C
Capillary and suction tube
D
Discharge and capillary tube
Question 27 1 Marks
What is the fault in compressor motor if there is electrical continuity between the dome and motor terminal?
A
Shorted run winding
B
Open common terminal
C
Shorted start winding
D
Grounded compressor motor
Question 28 1 Marks
Which refrigerant is used in domestic refrigerator?
A
R 22
B
R 32
C
R 134 a
D
R 407 c
Question 29 1 Marks
Which component rejects the maximum heat to ambinet air in refrigerator?
A
Expansion valve
B
Compressor
C
Condenser
D
Evaporator
Question 30 1 Marks
What is the name of heat carrying medium in vapour compression system?
A
Air
B
Water
C
Liquid
D
Refrigerant
Question 31 1 Marks
Which is the hydrocarbon refrigerant?
A
R 12
B
R123
C
R 500
D
R 600a
Question 32 1 Marks
How the zeotropic refrigerant is taken from the cylinder for charging it into RAC system?
A
Liquid state
B
Vapour state
C
Vapour and liquid
D
Super heated vapour
Question 33 1 Marks
What is the minimum distance to be maintained between the wall and refrigerator condenser?
A
13 cm
B
15 cm
C
18 cm
D
22 cm
Question 34 1 Marks
Which type of compressor is used as a vacuum pump?
A
Reciprocating
B
Centrifugal
C
Rotary
D
Scroll
Question 35 1 Marks
What is the resistance level of start winding in a refrigerator s compressor motor?
A
Medium resistance
B
High resistance
C
Zero resistance
D
Low resistance
Question 36 1 Marks
What is the reason for filter drier sweating in refrigerator?
A
Nitrogen in the system
B
Moisture in the system
C
Oxygen in the system
D
Oil in the system
Question 37 1 Marks
Which type of motor drive is used in hermetic compressor in refrigerator?
A
Belt drive
B
Gear drive
C
Direct drive
D
Push drive
Question 38 1 Marks
How the potential relay coil is connected internally to the relay terminals?
A
5 and 1
B
5 and 4
C
5 and 2
D
2 and 4
Question 39 1 Marks
Which process absorbs heat from the cabinet in refrigerator?
A
Expansion
B
Compression
C
Evaporation
D
Condensation
Question 40 1 Marks
Which gas is used for pressurising and testing leakage of RAC system?
A
O<sub>2</sub>
B
N<sub>2</sub>
C
O<sub>3</sub>
D
SO<sub>2</sub>
Question 41 1 Marks
What is the function of refrigerant fluid in a refrigerator?
A
Releases heat inside the cabinet
B
Absorbs heat from inside the cabinet
C
Absorbs heat from outside the cabinet
D
Absorbs heat from bottom side cabinet
Question 42 1 Marks
What is the full form of the relay - PTC?
A
Positive temperature coefficient
B
Permanent temperature control
C
Polar terminal checking
D
Positive terminal circuit
Question 43 1 Marks
Which method is used to check the leakage of hydro fluoro carbon refrigerants?
A
Electric torch
B
Litmus paper
C
Sulphur candles
D
Electronic leak detector
Question 44 1 Marks
Which refrigerant blend is highly flammable?
A
HCFC
B
HFC
C
CFC
D
HC
Question 45 1 Marks
How does the evaporator frost affect the sub zero temperature thermally in refrigerator?
A
As conductor
B
As insulator
C
As convector
D
As radiator
Question 46 1 Marks
Which part of the refrigerator cools the liquid refrigerant in capillary tube?
A
Discharge line
B
Suction line
C
Condenser
D
Evaporator
Question 47 1 Marks
Which two terminals read the highest resistance while testing refrigerator compressor motor?
A
Start and run
B
Common and run
C
Start and common
D
Start and compressor body
Question 48 1 Marks
What is ensured before removing a leaky evaporator in a refrigerator?
A
Recharge refrigerant to the system
B
Check the drain tray of evaporator
C
Removal of the thermostat sensor
D
Pressurize the system with refrigerant
Question 49 1 Marks
Which material is used to make the evaporator of refrigerator?
A
Galvanised iron
B
Stainless steel
C
Aluminium
D
Brass
Question 50 1 Marks
Which refrigerant is highly flammable?
A
HC - Hydro carbon
B
HFC - Hydro fluoro carbon
C
CFC - Chloro fluoro carbon
D
HCFC - Hydro chloro fluoro carbon
Question 51 1 Marks
Which is increased by the fins of condenser tubes in window air conditioner?
A
Heat transfer rate
B
Power consumption
C
Discharge pressure
D
Refrigerant flow rate
Question 52 1 Marks
Which type of condenser is used in window air conditioner?
A
Fins and tube
B
Plate and tube
C
Plate and coil
D
Bare tube
Question 53 1 Marks
Which safety device is used for compressor motor in window air conditioner?
A
Relay
B
Starting capacitor
C
Running capacitor
D
Over load protector
Question 54 1 Marks
Which material is used for making fins of condenser in a window air conditioner?
A
Brass
B
Copper
C
Cast iron
D
Aluminium
Question 55 1 Marks
Where the relay coil is internally connected in voltage relay?
A
Across 1 and 2
B
Across 5 and 1
C
Across 5 and 2
D
Across 2 and 4
Question 56 1 Marks
What is the purpose of operating the fan motor first and then the compressor motor in Air conditioners?
A
Cool the coils first by fan
B
Cool the compressor by fan
C
Minimise the noise of motors
D
Stop the high starting current by both motors
Question 57 1 Marks
Which relay is used in capacitor start, capacitor run (CSR) compressor motor?
A
Voltage relay
B
Current relay
C
Thermal relay
D
Amperage relay
Question 58 1 Marks
What is the capacity of compressor motor used in 1Ton window air conditioner?
A
0.50 HP
B
0.75 HP
C
0.95 HP
D
1.00 HP
Question 59 1 Marks
What is the reason for the compressor motor burn out in a window air conditioner?
A
Defective fan capacitor
B
Defective fan motor
C
Defective blower
D
Defective OLP
Question 60 1 Marks
Which device is used to exhaust the room air in window AC?
A
Damper
B
Air filter
C
Filter drier
D
Air washer
Question 61 1 Marks
Which type of evaporator is used in window air conditioner?
A
Bare tube
B
Plate and tube
C
Fins and plate
D
Fins and tube
Question 62 1 Marks
What is the reason for Very high condenser temperature in a window air conditioner?
A
Water splashes condenser
B
More air flows into the condenser
C
Fan motor working in good condition
D
Dust accumulated in the condenser fins
Question 63 1 Marks
What is the cooling capacity of 0.5 TR in BTU / hr?
A
6000
B
12000
C
18000
D
24000
Question 64 1 Marks
Which winding of compressor motor is directly connected across voltage relay coil?
A
Main winding
B
Starting winding
C
Running winding
D
Auxiliary winding
Question 65 1 Marks
What is the effect of sensing higher
temperature by thermistor NTC?
A
Resistance increases
B
Resistance decreases
C
Resistance becomes zero
D
Resistance becomes infinity
Question 66 1 Marks
What is the area of room cooled by 1ton window air conditioner?
A
5000 sq.ft
B
2000 sq.ft
C
1000 sq.ft
D
3000 sq.ft
Question 67 1 Marks
Where the normally closed contacts are internally connected in voltage relay?
A
Across 1 and 5
B
Across 2 and 5
C
Across 1 and 2
D
Across 2 and 4
Question 68 1 Marks
What is the reason for the compressor does not start but the fan motor works normally in window AC?
A
Defective blower
B
Defective fan motor
C
Defective fan capacitor
D
Defective compressor motor
Question 69 1 Marks
What is the remedy for the defective OLP in a window air conditioner?
A
Repair the OLP
B
Replace the OLP
C
Remove the parts
D
Repair the heater element
Question 70 1 Marks
What is the value of starting capacitor used for 1TR window air conditioner?
A
40 MFD
B
60 MFD
C
80 MFD
D
100 MFD
Question 71 1 Marks
What is the reason for excessive frost on evaporator coil in window AC?
A
Evaporator fins not blocked by dust
B
Blower rotating at higher speed
C
Air filter blocked completely
D
More air circulation in evaporator
Question 72 1 Marks
What is the cooling capacity of 1 TR in K Cal / hr?
A
3000
B
4000
C
5000
D
6000
Question 73 1 Marks
Which type of fan motor is used in window air conditioner?
A
Three phase single shaft motor
B
Single phase single shaft motor
C
Three phase double end shaft motor
D
Single phase double end shaft motor
Question 74 1 Marks
Which type of expansion valve is used in window air conditioner?
A
Capillary tube
B
Low side float valve
C
Automatic expansion valve
D
Thermostatic expansion valve
Question 75 1 Marks
Which capacity of fan motor is used in 1Ton window air conditioner?
A
1/5 HP
B
1/10 HP
C
1/16 HP
D
1/20 HP
Question 76 1 Marks
What is the value of starting capacitor used for 1.5TR capacity window air conditioner?
A
40 to 60 MFD
B
80 to 100 MFD
C
130 to 150 MFD
D
150 to 160 MFD
Question 77 1 Marks
Which winding has high inductance value in CSR compressor motor?
A
Common winding
B
Running winding
C
Starting winding
D
Auxiliary winding
Question 78 1 Marks
1 Which control device is used to maintain the room air temperature?
A
OLP
B
Relay
C
Thermostat
D
Selector switch
Question 79 1 Marks
What is the purpose of relay used in window air conditioner?
A
Disconnect the starting capacitor
B
Disconnect the running capacitor
C
Disconnect the fan capacitor
D
Disconnect the winding
Question 80 1 Marks
Which stabilizer capacity is used for 1 Ton window air conditioner?
A
2 KVA
B
3 KVA
C
4 KVA
D
5 KVA
Question 81 1 Marks
Where the filter drier is installed in window AC refrigerant circuit?
A
Discharge line
B
Suction line
C
Service line
D
Liquid line
Question 82 1 Marks
Which capacitor is connected in series with starting winding of CSR motor during operation?
A
Fan capacitor|
B
Run capacitor
C
Start capacitor
D
No capacitor is connected
Question 83 1 Marks
Which part of window AC removes dust particles from the room air?
A
Strainer
B
Air filter
C
Filter drier
D
Dehydrator
Question 84 1 Marks
How to neutralise the concentration of leaked ammonia from air
A
Recover ammonia from air
B
Spraying a lot of water
C
Shut down the plant
D
Spray Hydrochloric acid
Question 85 1 Marks
What is the cause of reduced supply air throw though air filter is clean in window AC?
A
No frost in the evaporator
B
Frost accumulated in the evaporator
C
Dust accumulated in the condenser
D
No dust accumulated in the evaporator
Question 86 1 Marks
What is the reason for Compressor does not start ?
A
Defective fresh air damper
B
Defective oscillation motor
C
Defective fan motor
D
Defective OLP
Question 87 1 Marks
What is the remedy to remove moisture from the window AC system?
A
Over gas charge in the system
B
Evacuate the system deeply
C
Clean the evaporator fins
D
Clean the condenser fins
Question 88 1 Marks
Which type of compressor is used in window air conditioner?
A
Belt drive
B
Open type
C
Sealed type
D
Swash plate
Question 89 1 Marks
Which is indicated by the arrow mark on filter drier component?
A
Flow direction of air
B
Position of capillary tube
C
Flow direction of refrigerant
D
Arrangement of desiccant and filter
Question 90 1 Marks
What is the value of running capacitor used for 1.5 TR window air conditioner?
A
36 MFD
B
40 MFD
C
80 MFD
D
100 MFD