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Engineering :: Refrigeration and Air conditioning


71.  In central air conditioning system
A. Entire equipment is placed in the air conditioned space B. There is only one machine which performs the function of air conditioning
C. All the major equipment is located in one central space removed from the air to be conditioned D. Is used when small area is to be air conditioned
E. None of the above    

72.  In control cooling water system, chromates, phosphates and silicates are added to water
A. To prevent scale formation B. To remove odour
C. To increase remove foreign particle D. To inhibit corrosion
E. To prevent algae growth    

73.  pH value of a brine solution is
A. 70 B. More than
C. Less than 7 D. 14
E. Could be any value    

74.  Air conditioning means
A. Cooling B. Heating
C. Dehumidifying D. Removal of air impurities
E. All above    

75.  The crankcase explosion of a refrigeration compressor
A. Means breakdown in compression B. Occurs between piston and cylinder heads
C. Occurs when load is too high D. Means ignition of refrigeration due to high temperature
E. Occurs due to ignition of vapours in compressor crank case    

76.  During adiabatic saturation process on unsaturated air
A. Dry bulb temperature remains constant B. Wet bulb temperature remains constant
C. Dew point temperature remains constant D. Relative humidity remains constant
E. None of the above    

77.  On a psychrometric chart sensible heating or cooling is represented by
A. A horizontal line B. A vertical line
C. Inclined line D. Curved line
E. None of the above    

78.  If wet bulb temperature is same as dew point, the relative humidity of air will be
A. 0 B. 25
C. 50 D. 67
E. 100    

79.  Dew point is
A. Percentage of moisture contained in a sample of air B. Partial pressure of water vapour in a sample of air
C. The temperature of water vapour in air starts D. The temperature at which condensation of water vapour in air starts
E. The temperature at which ice starts melting in presence of air without external aid    

80.  In case of completely dry air
A. Total heat is same as latent heat B. Total heat is same as sensible heat
C. Total heat is sum of sensible heat and latent heat D. Total heat is sum of sensible heat required for all individual constituents
E. None of the above    




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