Practice 1000 Steam Gas Turbines Multiple Choice Questions with Answers Quiz-2

Q.1.

If Carnot cycle has maximum possible thermal efficiency, then why don’t the steam turbine power plants run on Carnot cycle?

a) Because boiler can’t be maintained at constant pressure in Carnot cycle
b) Since work consumed by compressor is approximately equal to work produced by turbine
c) As mean temperature of heat addition is quite low in case of Carnot cycle
d) Because the process of heat addition is at constant temperature

Explanation

Q.2.

Gas turbines work on which of the following cycle?

a) Diesel cycle
b) Brayton cycle
c) Rankine cycle
d) None of the mentioned

Explanation

Q.3.

What does aerodynamic efficiency mean?

a) Amount of energy contained in steam
b) Energy that can be extracted from a given volume of steam at given temperature and pressure
c) Amount of steam turbine blade can allow to flow inside
d) None of the mentioned

Explanation

Q.4.

Steam turbine governing can be defined as __________

a) controlling the flow rate of steam
b) increasing the steam speed
c) adjusting the governors for particular speeds
d) none of the mentioned

Explanation

Q.5.

In steam turbines carry over losses are due to _____________

a) increase in temperature
b) formation of eddies in annular spaces
c) decrease in pressure
d) none of the mentioned

Explanation

Q.6.

Pressure ratios beloware used in _____________ engines.

a) aero derivative engines
b) heavy frame engines
c) steam turbine
d) none of the mentioned

Explanation

Q.7.

Why Hydrogen rings are used in gas turbine?

a) to control Oxygen consumption
b) to control Hydrogen consumption
c) to control Fuel consumption
d) None of the mentioned

Explanation

Q.8.

Which of the following can be used as fuels in gas turbines?

a) petroleum
b) Diesel
c) Natural gases
d) All of the mentioned

Explanation

Q.9.

Why is steam turbine governing used?

a) To increase the steam speed
b) To decrease the steam speed
c) To maintain steam speed constant
d) None of the mentioned

Explanation

Q.10.

In a steam turbine a set of ________ blades are connected to casing.

a) stationary & rotating
b) stationary
c) rotating
d) none of the mentioned

Explanation

Q.11.

Passages in steam turbines are _______

a) convergent & divergent
b) convergent
c) divergent
d) none of the mentioned

Explanation

Q.12.

Steam turbine performance is expressed in _______

a) heat & steam rate
b) heat rate
c) steam rate
d) none of the mentioned

Explanation

Q.13.

When initial pressure of the steam turbine is not upto the designed pressure then power produced will _________

a) Remains constant
b) Increase
c) Decrease
d) None of the mentioned

Explanation

Q.14.

Steam turbines used in nuclear reactors use __________

a) Specific heat
b) Superficial fluids
c) High pressure steam
d) None of the mentioned

Explanation

Q.15.

Superficial steam turbines can be operated at ________

a) low speeds
b) high speeds
c) medium speeds
d) none of the mentioned

Explanation

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