Engineering Questions with Answers - Multiple Choice Questions

# Steam Turbines MCQ’s – Energy Transfer Relation and Losses

1 - Question

Temperature of the steam leaving the boiler is ____________
a) low
b) high
c) medium
d) none of the mentioned

Explanation: Steam leaves the boiler at super heated stage with high temperature.

2 - Question

Pressure of the steam leaving the boiler is ______
a) low
b) medium
c) high
d) none of the mentioned

Explanation: Steam leaves the boiler at super heated stage with high pressure.

3 - Question

Steam when passes through the nozzle _______ its kinetic energy.
a) Increases
b) Decreases
c) Nozzle has nothing to do with kinetic energy
d) None of the mentioned

Explanation: When steam is passed through the nozzle its velocity increases as a result its kinetic energy increases.

4 - Question

In a reaction turbine fixed nozzle is replaced by __________
c) moving vanes
d) none of the mentioned

Explanation: In a reaction turbine the work of increasing kinetic energy is done by fixed blades.

5 - Question

Work done by the condenser is product of mass flow and _______
a) final enthalpy
b) initial enthalpy
c) change in enthalpy
d) none of the mentioned

Explanation: Work done by the condenser is product of mass flow and change in enthalpy.

6 - Question

Turbine performance is ____________ proportional to isoentropic efficiency.
a) directly
b) inversly
c) not proportional
d) none of the mentioned

Explanation: Turbine performance is directly proportional to isoentropic efficiency.

7 - Question

While calculating isoentropic efficiency heat loss to the surroundings is assumed to be _______
a) high
b) low
c) medium
d) none of the mentioned

Explanation: While calculating isoentropic efficiency heat loss to the surrounding is assumed to be zero.

8 - Question

The starting temperature of actual turbine is ________ the ideal turbine.
a) less than
b) greater than
c) equal to
d) none of the mentioned

Explanation: The starting temperature of the both actual and ideal turbine is equal.

9 - Question

The starting pressure of actual turbine is __________ that of ideal turbine.
a) equal to
b) more than
c) less than
d) none of the mentioned

Explanation: The starting pressure of both actual and ideal turbine is equal.

10 - Question

Isoentropic efficiency is the _________ of actual work and ideal work.
a) product
b) ratio
c) sum
d) none of the mentioned