Steam and Gas Turbines Multiple Choice Questions 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
Answer: a
Clarification: 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
Answer: c
Clarification: 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
b) Velocity gradient
c) No specific ratio
d) None of the mentioned
Answer: a
Clarification: 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
Answer: c
Clarification: 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
Answer: b
Clarification: 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
Answer: c
Clarification: 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
Answer: a
Clarification: 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
Answer: d
Clarification: Velocity coefficient can be applied for any flow passage.
9. Blade profile losses for a diffuser blade depends on ____________
a) Enthalpy
b) Entropy
c) Kinetic energy
d) None of the mentioned
Answer: c
Clarification: 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
Answer: b
Clarification: Losses at the stages of turbomachines are greater than blade profile losses.