Tertiary and Vocational Education Commission
Knowledge Assessment – January 2020
Refrigeration and Air Conditioning Technician
National Vocational Qualification – Level 04
Time: 03 Hours
Instructions for the Candidates
This Question Paper Comprises of 2 sections as Part 1 & 2
This paper consists of Multiple Choice Questions (MCQ) and short answer questions
Choose the most suitable answer from the given four answers of each
questions in Part 1 and mark as “X” in the appropriate places of the answer
sheet
Answer all questions in Part 2
This question paper consists of 18 pages.
Part - 1
1. The following is the measurement taken from the micro meter. The value as shown is,
a. 5.25mm
b. 7.25 mm
c. 7.5 mm
d. 7.76 mm
2. The hand manual which is provided to the customer when purchasing a machine is
a. Service Manual
b. User Manual
c. Guarantee Card
d. Payment Card
3. What is indicated in the symbol that is shown in the following diagram?
a. Travel downstairs
b. Protect from water
c. Protect from electricity
d. Slippery Area
4. While operating an air-conditioner when the compressors start to work, power was
disconnected due to functioning of the trip switch. The reason for this occurrence is,
a. The primary coil of the compressor burnt out
b. There is no refrigerant in the system
c. The running coil of the compressor is burnt out
d. The compressor coil is connected to earth
Page 1 of 18
Tertiary and Vocational Education Commission January 2019
,5. When is the occasion the refrigerant is sent excessively through the Thermal Static
Expansion Valve,
a. When the overheated thermal value is less in the evaporator
b. The sub coolant in the liquefier is less
c. When the overheated thermal value is more in the evaporator
d. The sub coolant in the liquefier is more
6. The best place to locate an oil separator is,
a. In the liquid tube
b. In the suction tube
c. In exhaust tube
d. In the capillary tube
7. Following is the diagram of the refrigerant tube system of an air conditioner with a Heat
Pump.
What is the name of the equipment that is shown as in No. 2
a. 1 - way Solenoid Valve
b. 2 - way Solenoid Valve
c. 3 - way Solenoid Valve
b. 4 - way Solenoid Valve
8. The Chilled water temperature in a central air conditioning system is at 60 Celsius. What
is the Fahrenheit value?
a. 35.3
b. 38.0
c. 42.8
d. 50.0
Page 2 of 18
Tertiary and Vocational Education Commission January 2019
, 9. Which one of following is the chemical formula for Refrigerant R-22 ?
a. C CL2F2
b. CHCLF2
c. C CLF3
d. CHCL3
10. The internal of a Brushless DC motor used in the Inverter /VRF of the system in the air
conditioner is shown in the following diagram. What is indicated as in B
a. Permanent Magnet
b. Electrical Magnet
c. Armature
d. Squirrel cage rotator
11. From which mixture of refrigerants, R-410A refrigerant is made of?
a. R-12 / R-22
b. R-134a / R-600ª
c. R-32 / R-125
d. R-125 / R-143ª
12. When producing an air conditioner, the manufacturers will mention the sound that emanates
from it in the specification. What is the measuring unit that is used for this purpose?
a. Decibel
b. Calorie
c. Coulomb
d. Hertz
13. Which of the following Refrigerant is known as CF3CH2F?
a. R-12
b. R-22
c. R-134a
d. R-410a
Page 3 of 18
Tertiary and Vocational Education Commission January 2019
Knowledge Assessment – January 2020
Refrigeration and Air Conditioning Technician
National Vocational Qualification – Level 04
Time: 03 Hours
Instructions for the Candidates
This Question Paper Comprises of 2 sections as Part 1 & 2
This paper consists of Multiple Choice Questions (MCQ) and short answer questions
Choose the most suitable answer from the given four answers of each
questions in Part 1 and mark as “X” in the appropriate places of the answer
sheet
Answer all questions in Part 2
This question paper consists of 18 pages.
Part - 1
1. The following is the measurement taken from the micro meter. The value as shown is,
a. 5.25mm
b. 7.25 mm
c. 7.5 mm
d. 7.76 mm
2. The hand manual which is provided to the customer when purchasing a machine is
a. Service Manual
b. User Manual
c. Guarantee Card
d. Payment Card
3. What is indicated in the symbol that is shown in the following diagram?
a. Travel downstairs
b. Protect from water
c. Protect from electricity
d. Slippery Area
4. While operating an air-conditioner when the compressors start to work, power was
disconnected due to functioning of the trip switch. The reason for this occurrence is,
a. The primary coil of the compressor burnt out
b. There is no refrigerant in the system
c. The running coil of the compressor is burnt out
d. The compressor coil is connected to earth
Page 1 of 18
Tertiary and Vocational Education Commission January 2019
,5. When is the occasion the refrigerant is sent excessively through the Thermal Static
Expansion Valve,
a. When the overheated thermal value is less in the evaporator
b. The sub coolant in the liquefier is less
c. When the overheated thermal value is more in the evaporator
d. The sub coolant in the liquefier is more
6. The best place to locate an oil separator is,
a. In the liquid tube
b. In the suction tube
c. In exhaust tube
d. In the capillary tube
7. Following is the diagram of the refrigerant tube system of an air conditioner with a Heat
Pump.
What is the name of the equipment that is shown as in No. 2
a. 1 - way Solenoid Valve
b. 2 - way Solenoid Valve
c. 3 - way Solenoid Valve
b. 4 - way Solenoid Valve
8. The Chilled water temperature in a central air conditioning system is at 60 Celsius. What
is the Fahrenheit value?
a. 35.3
b. 38.0
c. 42.8
d. 50.0
Page 2 of 18
Tertiary and Vocational Education Commission January 2019
, 9. Which one of following is the chemical formula for Refrigerant R-22 ?
a. C CL2F2
b. CHCLF2
c. C CLF3
d. CHCL3
10. The internal of a Brushless DC motor used in the Inverter /VRF of the system in the air
conditioner is shown in the following diagram. What is indicated as in B
a. Permanent Magnet
b. Electrical Magnet
c. Armature
d. Squirrel cage rotator
11. From which mixture of refrigerants, R-410A refrigerant is made of?
a. R-12 / R-22
b. R-134a / R-600ª
c. R-32 / R-125
d. R-125 / R-143ª
12. When producing an air conditioner, the manufacturers will mention the sound that emanates
from it in the specification. What is the measuring unit that is used for this purpose?
a. Decibel
b. Calorie
c. Coulomb
d. Hertz
13. Which of the following Refrigerant is known as CF3CH2F?
a. R-12
b. R-22
c. R-134a
d. R-410a
Page 3 of 18
Tertiary and Vocational Education Commission January 2019
