1. How does the refrigerant enters the compressor in an operating refrigeration system, as a under normal conditions?

A. Liquid
B. Superheated vapor
C. Wet saturated gas
D. None of the above

2. What happens to the air particles, when sound travels through air?

A. Vibrate along the direction of wave propagation
B. Vibrate but not in any fixed direction
C. Vibrate perpendicular to the direction of wave propagation
D. None of the above

3. What is the amplitude of a wave?

A. The distance the wave moves in one second
B. The distance the wave moves in one time period of the wave
C. The maximum distance moved by medium particles on either side of mean position
D. None of the above

4. What is the binding material in a mortar used for constructing a wall?

A. Cement
B. Sand
C. Cinder
D. None of the above

5. Where does the temperature of a refrigerant gas is highest at?

A. At the compressor discharge
B. At the compressor suction
C. In the expansion valve
D. None of the above

Answers:      1 (B), 2 (A), 3 (C), 4 (A), 5 (A)

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