The centrifugal compressors are generally used for refrigerants that require sma

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Question
The centrifugal compressors are generally used for refrigerants that require
Options
A. small displacements and low condensing pressures
B. large displacements and high condensing pressures
C. small displacements and high condensing pressures
D. large displacements and low condensing pressures

Correct Answer

large displacements and low condensing pressures

Heat Transfer, Refrigeration and Air Conditioning problems

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1. The multi-stage compression ofair as compared to single stage compression
Options
A. improves volumetric efficiency for the given pressure ratio
B. reduces workdone per kg of air
C. gives more uniform torque
D. all of these

2. Which one of the following is the effect of blade shape on performance of a centrifugal compressor?
Options
A. Backward curved blades has poor efficiency
B. Backward curved blades lead to stable performance
C. Forward curved blades has higher efficiency
D. Forward curved blades produce lower pressure ratio

6. A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities C_max and C_min. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as
Options
A.
B.
C. AU C_min
D.

7. Which of the following statement is correct for ammonia as a refrigerant?
Options
A. It is toxic to mucous membranes.
B. it requires large displacement per TR compared to fluoro carbons.
C. It reacts with copper and its alloys.
D. all of these

9. Conduction is a process of heat transfer
Options
A. from one particle of the body to another without the actual motion of the particles
B. from one particle of the body to another by the actual motion of the heated particles.
C. from a hot body to a cold body, in a straight line, without affecting the intervening medium
D. none of the above

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