Quiz Questions

ITI Quiz - 02-Feb-2026 08:56 AM (ITISKILL1699WP)

Q-Paper A-Paper
Question 1 1 Marks
What is the unit of heat in M.K.S system?
A
B.T.U (British thermal unit)
B
K.Cal (Kilo Calorie)
C
KV (Kilo Volt)
D
K.W (Kilo Watt)
Question 2 1 Marks
Which method is used to connect the swaged joint in copper tubes?
A
TIG welding
B
Silver brazing
C
Lead soldering
D
Fusion welding
Question 3 1 Marks
Which law is related to the constant PV at constant T?
A
Boyles law
B
Charles s law
C
Pascal s law
D
Renaults law
Question 4 1 Marks
What is the equivalent absolute scale for centigrade?
A
Kelvin
B
Celsius
C
Rankine
D
Fahrenheit
Question 5 1 Marks
Which thermodynamic process the temperature is kept constant?
A
Isobaric process
B
Isothermal process
C
Constant volume process
D
Constant pressure process
Question 6 1 Marks
Which compressor dome handles high pressure and high temperature vapour?
A
Semi hermetic reciprocating compressor
B
Open type reciprocating compressor
C
Hermetic reciprocating compressor
D
Hermetic rotary compressor
Question 7 1 Marks
What is top dead centre in reciprocating compressor cylinder?
A
The piston moves down from the point of cylinder
B
The piston moves up from the point of cylinder
C
The piston stops in cylinder at bottom
D
The piston starts in cylinder at bottom
Question 8 1 Marks
What is the rate of doing work?
A
Duty
B
Force
C
Power
D
Velocity
Question 9 1 Marks
Which components are connected by metering device in vapour compression cycle?
A
Condenser and evaporator
B
Compressor and condenser
C
Evaporator and suction line
D
Compressor and evaporator
Question 10 1 Marks
What is the advantage of using flux in brazing?
A
Over heating
B
Melting tubes
C
Prevent Oxidation
D
Chemical reaction
Question 11 1 Marks
What is the atmospheric pressure at sea
level?
A
1.033 kg/cm<sup>2</sup>
B
1.3 Kg/cm<sup>2</sup>
C
1.5 Kg/cm<sup>2</sup>
D
1.6 Kg/cm<sup>2</sup>
Question 12 1 Marks
What is the absolute zero temperature in
degree centigrade?
A
0 Degree Centigrade
B
100 Degree Centigrade
C
-273 Degree Centigrade
D
212 Degree Centigrade
Question 13 1 Marks
What is the capacity of doing work?
A
Work
B
Power
C
Force
D
Energy
Question 14 1 Marks
What is the absolute pressure of gas in a cylinder, if gauge reads 135.3 p.s.i?
A
130 p.s.i.a
B
140 p.s.i.a
C
150 p.s.i.a
D
160 p.s.i.a
Question 15 1 Marks
What is effect of compression process on refrigerant vapour?
A
Heat the vapour below saturation
B
Cool the vapour above saturation
C
Increase the pressure and temperature
D
Decrease the pressure and temperature
Question 16 1 Marks
Which refrigeration system works on
directly by the heat energy?
A
Jet refrigeration
B
Mechanical refrigeration
C
Vapour absorption refrigeration
D
Vapour compression refrigeration
Question 17 1 Marks
Which condition is maintained for refrigerant in high side of vapour compression system?
A
Above its critical temperature
B
Below its critical temperature
C
Above its freezing temperature
D
Below its freezing temperature
Question 18 1 Marks
What is the barometer reading at sea level in Hg column?
A
760 mm
B
750 mm
C
740 mm
D
730 mm
Question 19 1 Marks
What is the purpose of accumulator in a refrigerator?
A
Improves oil circulation
B
Prevents surging of refrigerant
C
Avoids hunting of refrigerant
D
Prevents liquid flood back to compressor
Question 20 1 Marks
Which instrument is used to measure atmospheric pressure?
A
Hygrometer
B
Hydrometer
C
Manometer
D
Barometer
Question 21 1 Marks
How the level of heat in a substance is
expressed?
A
Micron
B
Pressure
C
Humidity
D
Temperature
Question 22 1 Marks
Which components maintain the pressure difference in RAC system?
A
Condenser and filter
B
Evaporator and motor
C
Receiver and condenser
D
Compressor and expansion device
Question 23 1 Marks
What is the melting temperature of silver
brazing rod?
A
1120 Degree F
B
1200 Degree F
C
1250 Degree F
D
1300 Degree F
Question 24 1 Marks
What is the physical state of ammonia at condenser inlet in vapour absorption system?
A
Solid
B
Liquid
C
Vapour
D
Semi solid
Question 25 1 Marks
Which two components do the compressor function in vapour absorption system?
A
Generator and absorber
B
Generator and separator
C
Generator and condenser
D
Generator and evaporator
Question 26 1 Marks
Which instrument is used for measuring
heat?
A
Thermometer
B
Anemometer
C
Calorimeter
D
Ammeter
Question 27 1 Marks
Which factors produce work?
A
Force and distance
B
Time and distance
C
Force and power
D
Force and time
Question 28 1 Marks
What is bottom dead centre in reciprocating compressor cylinder?
A
The piston moves up from the point of cylinder
B
The piston stops in cylinder at top
C
The piston moves down from the point of cylinder
D
The piston starts in cylinder at top
Question 29 1 Marks
Which component controls the thermostat and defrost heater in frost free refrigerator?
A
Thermoheater
B
Defrost timer
C
Relay
D
OLP
Question 30 1 Marks
What is the boiling point of pure water in centigrade scale?
A
212 Degree Centigrade
B
100 Degree Centigrade
C
32 Degree Centigrade
D
0 Degree Centigrade
Question 31 1 Marks
What is the energy of a body by virtue of its position?
A
Wind energy
B
Kinetic energy
C
Potential energy
D
Electrical energy
Question 32 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 33 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 34 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 35 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 36 1 Marks
What is the result if discharge reed is broken in open type compressor?
A
Poor pumping
B
More pumping
C
Oil pumping
D
No pumping
Question 37 1 Marks
Which component switches ON/OFF the starting winding in RSIR motor?
A
Thermostat
B
Capacitor
C
Relay
D
OLP
Question 38 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 39 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 40 1 Marks
Which component actuates the defrost cycle in frost free refrigerator?
A
Bimetal thermo
B
Defrost heater
C
Timer
D
Relay
Question 41 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 42 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 43 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 44 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 45 1 Marks
Which component is used in frost free refrigerator?
A
Plate coil evaporator
B
Liquid receiver
C
Oil separator
D
Timer switch
Question 46 1 Marks
Which electrical control cuts off heating element in frost free refrigerator?
A
Bimetal thermo
B
Thermostat
C
Relay
D
Timer
Question 47 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 48 1 Marks
How the capacity of refrigerator is expressed?
A
Weightage
B
Tonnage
C
Wattage
D
Litres
Question 49 1 Marks
Which domestic system uses automatic defrost?
A
Frost free refrigerator
B
Conventional refrigerator
C
Split air - conditioner
D
Window air - conditioner
Question 50 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 51 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 52 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 53 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 54 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 55 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 56 1 Marks
Which device protects the compressor motor from drawing more current?
A
OLP
B
Relay
C
Thermostat
D
Door switch
Question 57 1 Marks
Which component defrosts in frost free refrigerator?
A
Bulb
B
Heater
C
Thermostat
D
Capillary tube
Question 58 1 Marks
What is the effect of contamination in refrigeration system?
A
High heating
B
Poor cooling
C
Low pressure
D
Low humidity
Question 59 1 Marks
Which device equalizes the system pressure in frost free refrigerator?
A
Capillary tube
B
Compressor
C
Condenser
D
Evaporator
Question 60 1 Marks
Which type of evaporator is used in frost free refrigerator?
A
Plate type
B
Wire mesh
C
Finned tube
D
Shell and tube