Related Questions

The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.
A Refrigerant cooling
B Evaporator
C Condenser
D Throttling
If a truck can carry 10 to 16 boxed refrigerators, then what is the least number of refrigerators that 4 trucks can carry?
A 40
B 52
C 48
D 64
Formation of frost on evaporator in refrigerator
A Results in loss of heat due to poor heat transfer
B Increases heat transfer rate
C Is immaterial
D Can be avoided by proper design
The evaporator used in household refrigerators is
A Frosting evaporator
B Non-frosting evaporator
C Defrosting evaporator
D None of these
Most of the domestic refrigerators work on the following refrigeration system
A Vapour compression
B Vapour absorption
C Carnot cycle
D Electrolux refrigerator
Refrigerants commonly used for domestic refrigerators are
A Ethyl chloride or methyle chloride
B Freon-12
C Propane
D NH3 or CO2
The formation of frost on cooling coils in a refrigerator
A Increases heat transfer
B Improves C.O.P. of the system
C Increases power consumption
D Reduces power consumption
The diameters of fire tubes and superheater tubes in locomotive boiler are
A 47.5 mm, 130 mm
B 32.5 mm, 180 mm
C 65.5 mm, 210 mm
D 24.5 mm, 65 mm
Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its
A High co-efficient of thermal expansion
B Low thermal conductivity
C High corrosion resistance
D All of the above
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes
A Are easier to clean
B Are less prone to fouling
C Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
D None of these

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