Steam Nozzles and Turbines MCQs
Steam Nozzles and Turbines MCQs
Answer these 20 Steam Nozzles and Turbines MCQs and see how sharp is your knowledge of Steam Nozzles and Turbines.
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1: De-Laval turbine is a
A. None of these
B. Simple impulse turbine
C. Simple reaction turbine
D. Impulse-reaction turbine
2: The critical pressure ratio for initially dry saturated steam is more as compared to initially wet steam.
A. No
B. Yes
3: Rateau turbine is
A. Pressure compounded turbine
B. Simple reaction turbine
C. Pressure-velocity compounded turbine
D. Velocity compounded turbine
4: The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
A. Remains same
B. Increases
C. Decreases
5: For maximum efficiency of an impulse turbine, the steam should leave the blades at right angles to their motion.
A. Correct
B. Incorrect
6: The ratio of the work delivered at the turbine shaft to the heat supplied is called overall thermal efficiency of turbine.
A. True
B. False
7: Which of the following statement is correct?
A. The pressure of steam at throat is called critical pressure.
B. The expansion of steam in a nozzle follows Rankine cycle.
C. The friction in the nozzle increases the dryness fraction of steam.
D. All of these
8: The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
A. Remains constant
B. Increases
C. Decreases
9: The flow of steam is super-sonic
A. At the entrance to the nozzle
B. In the convergent portion of the nozzle
C. At the throat of the nozzle
D. In the divergent portion of the nozzle
10: The pressure at which the steam leaves the nozzle is known as back pressure.
A. Incorrect
B. Correct
11: In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p2) will be
A. 3.3 bar
B. 9.9 bar
C. 8.2 bar
D. 5.46 bar
12: The variation of steam pressure in the nozzle depends upon
A. Velocity of steam
B. Specific volume of steam
C. All of these
D. Dryness fraction of steam
13: The action of steam in a steam turbine is
A. Dynamic
B. Neither static nor dynamic
C. Static
D. Static and Dynamic
14: The flow through a nozzle is regarded as
A. Isothermal flow
B. Isentropic flow
C. Constant pressure flow
D. Constant volume flow
15: The discharge is __________ at critical pressure.
A. Maximum
B. Zero
C. Minimum
16: The critical pressure ratio for initially wet steam is
A. 0.577
B. 0.582
C. 0.601
D. 0.546
17: The ratio of the useful heat drop to the isentropic heat drop is called
A. Vacuum efficiency
B. Nozzle efficiency
C. Condenser efficiency
D. Boiler efficiency
18: Thermal equilibrium means that the flow of steam is
A. Hyperbolic
B. Isothermal
C. Polytropic
D. Isentropic
19: The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.
A. Agree
B. Disagree
20: The ratio of the workdone on the blades to the energy supplied to the blades, is called
A. Blading efficiency
B. Gross or stage efficiency
C. Mechanical efficiency
D. Nozzle efficiency
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