Refrigeration And Air Conditioning Quiz : When you prepare for any exam, it is very important for you to know the pattern and syllabus of that exam first so that you can prepare well for it in the shortest time. For the candidates who are preparing for the ITI exam, in this post, the test has been given as per the pattern and syllabus of the iti Refrigeration And Air Conditioning exam, by solving which you can make your preparation much better. For all the candidates preparing for iti Refrigeration And Air Conditioning, many more online practice sets have been provided on our website, by solving which they can make their preparation better.
Refrigeration And Air Conditioning Quiz
1. The ………. of a car air conditioner allows the full range of blower speed from full, fast to slow.
• Magnetic clutch
• Thermostat
• Fuse
• Rheostat
Answer. Rheostat
2. Capacitor block (for use with capacitor start and electric motor run) has what number of electrical connections?
• 2
• 4
• 3
• 5
Answer. 4
3. Hermetic system is used in?
• Refrigerators
• Window type AC
• Bottle coolers and water coolers
• All of these
Answer. All of these
4. What is the reason for burning out of compressor motor?
• OLP defective
• Thermostat defective
• Liquid line blocked
• Shortage of refrigerant
Answer. OLP defective
5. What is the reason for burning out of relay core?
• Defective selector switch
• High voltage
• Low voltage
• High current
Answer. High voltage
6. When an induction motor is at stand still, slip occurs when ……….
• 0
• 1
• -1
• Infinite
Answer. 1
7. The power factor of a three phase induction motor during no load condition is ……….
• High
• Moderate
• Negative
• Low
Answer. Low
8. The speed of an AC motor depends on?
• Frequency
• Number of poles
• Both frequency and number of poles
• None of these
Answer. Both frequency and number of poles
9. The starting torque of a capacitor start motor is?
• Less
• Zero
• Equal to rated torque
• More than rated torque
Answer. Less
Refrigeration And Air Conditioning Model Question paper
10. The motor used in domestic refrigerators is?
• DC series motor
• Single phase induction motor
• DC shunt motor
• Universal motor
Answer. Single phase induction motor
11. ……….. are generally used in domestic refrigerators.
• Water cooled condenser
• Evaporative condenser
• Air cooled condenser
• None of these
Answer. Air cooled condenser
12. What is used as a cooling medium in evaporative condenser?
• Only air
• Only water
• Both air and water
• Neither air nor water
Answer. Both air and water
13. The effectiveness of a cooling tower depends on?
• Wet bulb temperature of air
• Dry bulb temperature of air
• Direction of air flow
• None of these
Answer. Wet bulb temperature of air
14. Cooling is produced by?
• Evaporation
• Radiation
• Condensation
• Absorption
Answer. Evaporation
15. Condenser fins and refrigerant should be cleaned with?
• Soap solution
• Fin comb
• Diluted acid
• Paint brush
Answer. With a paint brush
16. In domestic refrigerators, the accuracy of working of capillary tube depends on?
• Atmospheric pressure
• Its internal dimensions
• Temperature of the refrigerant
• Relative humidity
Answer. Its internal dimensions
17. Which expansion valves are used in domestic refrigerators?
• Constant pressure expansion valve
• Float valve
• Thermostatic expansion valve
• Capillary tube
Answer. Capillary tube
18. In flooded type chiller applications, which expansion valves are used?
• Constant pressure expansion valve
• Float valve
• Thermostatic expansion valve
• Capillary tube
Answer. Float valve
19. Which tool is used for cutting capillary tube?
• Chisel
• Brazing torch
• File
• Hacksaw
Answer. Brazing torch
20. Dehydrator is installed in?
• Liquid line
• Suction line
• Discharge line
• Capillary line
Answer. Liquid line
21. Heat exchanger is installed in a system between?
• Hot gas and suction line
• Suction and discharge line
• Suction and liquid line
• Hot gas and liquid line
Answer. Hot gas and liquid line
22. Plate type evaporator is often used in?
• Domestic dehumidifier
• Two compartment refrigerator
• Domestic air conditioner
• Drinking water cooler
Answer. Two compartment refrigerator
23. The operating condition of the evaporator can be –
• Frosting
• De-frosting
• Non-frosting
• All of these
Answer. All of these
24. What is the state of the refrigerant when it enters the evaporator?
• High pressure, low temperature
• Low pressure, low temperature
• Low pressure, high temperature
• Medium pressure, low temperature
Answer. Low pressure, low temperature
25. What is the purpose of installing a fan on a fed coil evaporator?
• Increasing the life of the refrigerant
• Increasing the refrigeration capacity
• Ease the starting load on the compressor
• None of these
Answer. Increasing the refrigeration capacity
26. Leaks in a refrigeration system using Freon are detected by?
• Acetylene torch
• Sulphur sticks
• Halide torch
• Soap water
Answer. Halide torch
27. The boiling point of a refrigerant can be varied by varying the:
• Superheat setting of the expansion valve
• Pressure in the refrigeration system
• Setting of the thermostat in the system
• Moisture content of the refrigerant
Answer. Pressure in the refrigeration system
28. Which of the following refrigerants is toxic?
• R-11
• R-22
• R-12
• R-717
Answer. R-717
29. A good refrigerant should have?
• Low boiling point
• High critical temperature
• High latent heat of vaporization
• All of these
Answer. All of these
30. What is the boiling point of NH3?
• – 33.3°C
• – 50°C
• – 100°C
• 0°C
Answer. – 33.3°C
31. What should be the first action taken when a domestic air conditioner has lost its refrigerant due to excessive use?
• Recharge the system
• Check for the presence of moisture in the system
• Find and repair leaks, if any
• Check for the presence of acid in the system
Answer. Find and repair any leaks
32. Which of the following steps is most important before applying heat during welding and brazing of refrigerant to replace fittings?
• Cleaning the tubing
• Removing insulation
• Wearing a welding mask
• Pumping out all the refrigerant
Answer. Wearing a welding mask
33. What is an anemometer used for?
• To measure the RPM of the motor shaft
• Air velocity
• Atmospheric pressure
• Very low temperatures
Answer. Air velocity
34. While the compressor is running, lubricating oil should always flow towards:
• Towards the condenser tubes
• Towards the bearings
• Towards the capillary
• Towards the cooling coil
Answer. Towards the bearing
35. A material used between two metallic surfaces or joints to make them leak free is called?
• Gasket
• Seal
• Stopper
• Shim
Answer. Gasket
36. The insulating capability of a material is measured by thermal ……….?
• Conductivity
• Resistance
• Conductance
• Connectivity
Answer. Conductivity
37. Which of the following is the oldest insulating material but is no longer in use because cheaper materials are available?
• Cork
• Fibreglass
• Calcium silicate
• Polyurethane
Answer. Cork
38. The purpose of air conditioning of a car is to make the passenger compartment comfortable by controlling the internal ……….?
• Temperature and humidity
• Temperature and pressure
• Humidity and pressure
• Temperature, humidity and pressure
Answer. Temperature and humidity
39. Which is not a method of heat transfer?
• Insulation
• Radiation
• Conduction
• Convection
Answer. Insulation
40. Which of the following is generally the best conductor of heat?
• Gas
• Plastic
• Metal
• Liquid
Answer. Metal
41. Which method is easy and inexpensive to cool a small space?
• Split AC
• Cooling Tower
• Package AC
• Window AC
Answer. Window AC
42. Which part of the AC helps in cleaning the air?
• Air handler
• Filter
• Evaporator
• Compressor
Answer. Filter
43. For most of the consumers, what is the determining factor while buying an AC?
• Energy efficiency
• Appearance
• Size
• Price
Answer. Price
44. Where are cassette air conditioners designed to be installed?
• In the wall of a room
• On the ceiling of a room
• On the floor of a room
• Outside the room
Answer. On the ceiling of a room
45. Which of the following is not a part of the outdoor unit of a split AC?
• Compressor
• Condenser coil
• Expansion coil
• Evaporator coil
Answer. Evaporator coil
46. What does the sound produce while running a split AC?
• Loud sound
• No sound
• Medium sound
• Low sound
Answer: No sound
47. What is the average running current of one ton AC?
• 7A
• 8.5A
• 6.2A
• 8A
Answer. 7A
48. The inner unit of split AC has?
• Single speed
• Three speed
• Two speed
• Four speed
Answer. Two speed
49. Thermostat controls the temperature of……….?
• Evaporator
• Room
• Condenser
• Refrigerant
Answer. Room
50. Where should a split AC unit be installed?
• In an open air place
• In a dark place
• In a place with direct sunlight
• In a closed room
Answer. In an open air place
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