Turbo Machines Test Questions Start Creating PDF

MCQ: What is the effect of increasing flow coefficient (Φ) in an axial flow compressor on blade loading coefficient (Ψ)?

1. Blade loading coefficient (Ψ) increases
2. Blade loading coefficient (Ψ) decreases
3. Blade loading coefficient (Ψ) remains constant
4. Unpredictable

MCQ: What is the ratio of the actual work absorbed by an axial flow compressor to the theoretical work called?

1. Work input factor
2. Workdone factor
3. Both a. and b.
4. None of the above

MCQ: ___________ can be defined as the ratio of the pressure rise in rotor blades to the pressure rise in stages in an axial flow compressor.

1. Degree of pressure
2. Degree of reaction
3. Pressure ratio
4. Reaction ratio

MCQ: What is the ratio of isentropic work to Euler work in an centrifugal compressor called?

1. Work coefficient
2. Velocity coefficient
3. Pressure coefficient
4. Flow coefficient

MCQ: The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal compressor is called as _________.

1. velocity factor
2. slip factor
3. work factor
4. none of the above

MCQ: The diffuser blades are kept ______ the number of impeller blades .

1. 1/10 th of
2. 1/3 rd of
3. 10 times
4. 3 times

MCQ: Vaneless diffusers are suitable for ___________.

1. only low pressure rise
2. only high pressure rise
3. both low as well as high pressure rise

MCQ: Angular momentum of gas in the free vortex of vaneless diffuser ___________.

1. increases
2. decreases
3. remains constant
4. becomes unpredictable

MCQ: Which of the following centrifugal pumps has higher specific speed than the others?

1. Axial flow
2. Radial flow
3. Mixed flow
4. All have same specific speed

MCQ: The volute pumps and vortex volute pumps are __________ pumps with _________ shaft.

1. multistage, horizontal
2. multistage, vertical
3. single stage, horizontal
4. single stage, vertical