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Mechanical Engineering Objective Questions { Refrigeration and AC }



92. The denser air system (air above atmospheric pre sure throughout the cycle), as compared to open air system, for same range of temperature in Bell-Colemann cycle results in
A.Lower C.O.P.
B.Higher C.O.P.
C.Same C.O.P.
D.Unpredictable

93. Lithium bromide in vapour absorption refrigeration system is used as
A.Refrigerant
B.Cooling substance
C.Auxiliary refrigerant
D.Absorbent

94. In electrolux refrigerator
A.Ammonia is absorbed in hydrogen
B.Ammonia evaporates in hydrogen
C.Ammonia is absorbed in water
D.Hydrogen evaporates in ammonia

95. What pressure is allowed on ammonia system's high pressure side in absorption refrigeration system
A.Atmospheric
B.5-10 kg/cm2
C.17-20 kg/cm2
D.25-30 kg/cm2

96. Fittings in ammonia absorption refrigeration system are made of
A.Cast steel or forgings
B.Copper
C.Brass
D.Aluminium

97. Reciprocating refrigeration compressor uses following type of valve
A.Rotary valve
B.Ring plate valve.
C.Globe valve
D.Poppet valve

98. The denser air system as compared to open air system, for same range of temperatures in Bell-Colemann cycle results in
A.Lower H.P./ton of refrigeration
B.Higher n2./ton of refrigeration
C.Same H.P.Iton of refrigeration
D.Unpredictable

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