Which one of the following is the effect of blade shape on performance of a cent

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Question
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

Correct Answer

Forward curved blades produce lower pressure ratio

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4. The workdone on a compressor will be minimum if air is taken from
Options
A. the atmosphere
B. a source at 0� C
C. a source of low temperature air
D. a source of high temperature air

6. 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

7. 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

8. 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.

9. 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

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