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121.

Presence of moisture in a refrigeration cycle will show its effect at

A.	Compressor suction	B.	Compressor discharge
C.	Expansion valve	D.	Condenser
E.	All of the above

122.

Which of the following symptoms will indicate under charging of a vapour compressor refrigeration cycle?

A.	Compressor runs continuously	B.	Frost on suction line
C.	Low suction pressure	D.	Low head pressure
E.	All of the above

123.

If a refrigerator is directly exposed to sun rays

A.	It will stop working	B.	The refrigerant will leak
C.	There will be less cooling effect	D.	Frost will be formed on cabinet surface
E.	(A) and (B) above

124.

In order to ensure leak proof mechanical links, the end of copper tubing in refrigeration cycle is

A.	Flared	B.	Brazed
C.	Soldered	D.	Press-fitted
E.	(C) and (D) together

125.

Which of the following valves is used on domestic refrigerators

A.	Solenoid valve	B.	Expansion valve
C.	Spring safety valve	D.	Wheel valve
E.	None of the above

126.

Which reciprocating compressor is usually used in domestic refrigerators?

A.	Open type	B.	Semi-sealed type
C.	Hermetically sealed type	D.	Any of the above
E.	None of the above

127.

Which of the following connections is usually not provided in a hermetically sealed type compressors?

A.	Refrigerant inlet	B.	Refrigerant outlet
C.	Lubricating oil charging connection	D.	Refrigerant charging connection
E.	There is no connection provided

128.

In which type of single phase motor the starting torque is low

A.	Shaded pole type	B.	Permanent split capacitor type
C.	Capacitor start type	D.	Capacitor start and capacitor run type
E.	Starting torque is same in all motors

129.

In a vapour compression refrigeration cycle, high head pressure is indicated which does not change even when compressor is stopped and allowed to cool. The probable cause may be

A.	High refrigerant charge	B.	Low refrigerant charge
C.	Air in the system	D.	High vapour pressure
E.	Any of the above

130.

A refrigerant is added to vapour compression cycle through

A.	High side in vapour form	B.	High side in liquid form
C.	Low side in liquid form	D.	None of the above