# Steam and Gas Turbines Questions and Answers – Losses in Impulse Blade Passages

This set of Steam and Gas Turbines Multiple Choice Questions & Answers (MCQs) focuses on “Losses in Impulse Blade Passages”.

1. ____________ is developed when working fluid is passed through blade passage.
a) Internal heat loss
b) External heat loss
c) Heat loss
d) None of the mentioned

Explanation: When working fluid is passing through blade passage, due to friction internal heat loss occurs.

2. Kinetic energy of working fluid is _________ kinetic energy of case lossless flow.
a) Equal to
b) Lesser than
c) Greater than
d) Depends on the situation

Explanation: Kinetic energy of the case lossless flow is lesser than the kinetic energy of working fluid.

3. Ratio of actual velocity to velocity of case lossless flow is called as _______
a) Velocity coefficient
c) No specific ratio
d) None of the mentioned

Explanation: Velocity coefficient is the ratio of actual velocity to velocity of case lossless flow.

4. Difference between actual enthalpy of working fluid to case enthalpy of isoentropic flow is called as _______
a) Case lossless flow
b) Entropy change
c) Losses
d) None of the mentioned

Explanation: Losses are the enthalpy differences between working fluid and casses of isoentropic flow.

5. The losses occurred due to enthalpy changes is caused due to _________
a) Pressure difference
b) Friction
c) Temperature difference
d) None of the mentioned

Explanation: Friction causes the enthalpy change.

6. Velocity coefficient is applicable for __________
a) Parallel flow passage
b) Counter flow passage
c) All types of flow passages
d) None of the mentioned

Explanation: Velocity coefficient is applicable for all types of flow passages.

7. Velocity coefficient can be applied for ___________ flow passage.
a) convergent
b) divergent
c) depends on
d) none of the mentioned

Explanation: Velocity coefficient can be applied for any flow passage.

8. Velocity coefficient can be applied for __________ blade passage.
a) none
b) impulse
c) reaction
d) any

Explanation: Velocity coefficient can be applied for any flow passage.

a) Enthalpy
b) Entropy
c) Kinetic energy
d) None of the mentioned

Explanation: Blade profile losses for a diffuser blade is related to the kinetic energy.

10. Blade profile losses are ____________ losses of the stages at turbomachine.
a) Greater
b) Smaller
c) Equal
d) None of the mentioned

Explanation: Losses at the stages of turbomachines are greater than blade profile losses.

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