- A. Small
- B. High
- C. Equal
- D. Anything
Refrigeration and Air Conditioning
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For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be_____.
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During cooling and dehumidification, dry bulb temperature_____.
- A. Remains constant
- B. Increases
- C. Decreases
- D. None of these
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A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be_____.
- A. 1 kW
- B. 2 kW
- C. 3 kW
- D. 4 kW
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In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is_____.
- A. Reversed Carnot cycle
- B. Reversed Joule cycle
- C. Reversed Brayton cycle
- D. Reversed Otto cycle
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The coefficient of performance of Heat Pump is always _____ one.
- A. Equal to
- B. Less than
- C. Greater than
- D. None of these
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Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?
- A. Ammonia
- B. Carbon dioxide
- C. Sulphur dioxide
- D. Fluorine
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Choose the correct statement_____.
- A. A refrigerant should have low latent heat
- B. If operating temperature of system is low, then refrigerant with low boiling point should be used
- C. Pre-cooling and sub-cooling bf refrigerant are same
- D. Superheat and sensible heat of a refrigerant are same
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In larger industrial and commercial reciprocating compression systems, refrigerant widely used is_____.
- A. Ammonia
- B. Carbon dioxide
- C. Sulphur dioxide
- D. R-12
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The domestic refrigerator uses following type of compressor_____.
- A. Centrifugal
- B. Axial
- C. Miniature sealed unit
- D. Piston type reciprocating
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In a domestic vapour compression refrigerator, the refrigerant commonly used is_____.
- A. CO?
- B. Ammonia
- C. R-12
- D. All of these