Multiple Choice Questions on Steam Nozzles and TurbinesThe Following Section consists of Multiple Choice Questions on Steam Nozzles and Turbines.
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Steam Nozzles and Turbines MCQ
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Question 1 of 20
1. Question
1 pointsA nozzle is said to be a convergent nozzle
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Question 2 of 20
2. Question
1 pointsA turbine is said to have an axial discharge when the steam leaves the blade tip at __________ to the direction of the blade motion.
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Question 3 of 20
3. Question
1 pointsThe flow through a nozzle is regarded as
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Question 4 of 20
4. Question
1 pointsThe ratio of total useful heat drop to the total isentropic heat drop, is called
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Question 5 of 20
5. Question
1 pointsIn a nozzle, whole frictional loss is assumed to occur between
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Question 6 of 20
6. Question
1 pointsThe critical pressure ratio for initially wet steam is
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Question 7 of 20
7. Question
1 pointsThe isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be
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Question 8 of 20
8. Question
1 pointsThe impulse reaction turbine has its driving force
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Question 9 of 20
9. Question
1 pointsA regenerative steam cycle renders
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Question 10 of 20
10. Question
1 pointsDe-Laval turbine is a
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Question 11 of 20
11. Question
1 pointsThe reheat factor is the ratio of the
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Question 12 of 20
12. Question
1 pointsThermal equilibrium means that the flow of steam is
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Question 13 of 20
13. Question
1 pointsWhen the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
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Question 14 of 20
14. Question
1 pointsThe ratio of the workdone on the blades to the energy supplied to the blades, is called
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Question 15 of 20
15. Question
1 pointsThe supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
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Question 16 of 20
16. Question
1 pointsThe steam leaves the nozzle at a
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Question 17 of 20
17. Question
1 pointsThe critical pressure gives the velocity of steam at the throat
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Question 18 of 20
18. Question
1 pointsThe Parsons’ reaction turbine has
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Question 19 of 20
19. Question
1 pointsThe action of steam in a steam turbine is
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Question 20 of 20
20. Question
1 pointsMulti-stage steam turbines are of the
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Steam Nozzles and Turbines MCQ 2
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Question 1 of 20
1. Question
1 pointsIn reaction turbines, the axial thrust is due to
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Question 2 of 20
2. Question
1 pointsWhich of the following statement is correct?
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Question 3 of 20
3. Question
1 pointsA binary vapour plant consists of
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Question 4 of 20
4. Question
1 pointsParson’s reaction turbine is a __________ reaction turbine.
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Question 5 of 20
5. Question
1 pointsThe variation of steam pressure in the nozzle depends upon
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Question 6 of 20
6. Question
1 pointsSteam turbines are used for
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Question 7 of 20
7. Question
1 pointsParson’s turbine is a
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Question 8 of 20
8. Question
1 pointsThe value of the reheat factor varies from
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Question 9 of 20
9. Question
1 pointsThe steam enters the nozzle at a
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Question 10 of 20
10. Question
1 pointsThe difference of supersaturated temperature and saturation temperature at that pressure is called
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Question 11 of 20
11. Question
1 pointsThe ratio of the useful heat drop to the isentropic heat drop is called
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Question 12 of 20
12. Question
1 pointsThe efficiency of steam turbines may be improved by
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Question 13 of 20
13. Question
1 pointsIn a reaction turbine, when steam flows through the fixed blades,
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Question 14 of 20
14. Question
1 pointsA single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be
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Question 15 of 20
15. Question
1 pointsThe flow of steam is super-sonic
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Question 16 of 20
16. Question
1 pointsDe-Laval turbine is a
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Question 17 of 20
17. Question
1 pointsThe impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 α, where α is the nozzle exit flow angle, if the
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Question 18 of 20
18. Question
1 pointsWhen the cross-section of a nozzle increases continuously from entrance to exit, it is called a
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Question 19 of 20
19. Question
1 pointsRateau turbine is
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Question 20 of 20
20. Question
1 pointsCurtis turbine is a
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Steam Nozzles and Turbines MCQ 3
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Question 1 of 20
1. Question
1 pointsThe critical pressure ratio for initially dry saturated steam is
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Question 2 of 20
2. Question
1 pointsThe critical pressure ratio for gases is
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Question 3 of 20
3. Question
1 pointsThe effect of supersaturation is that the
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Question 4 of 20
4. Question
1 pointsThe effect of friction on the flow of steam through a nozzle is to
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Question 5 of 20
5. Question
1 pointsThe ratio of the isentropic heat drop to the heat supplied, is called
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Question 6 of 20
6. Question
1 pointsThe purpose of governing in steam turbines is to
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Question 7 of 20
7. Question
1 pointsDe-Laval turbines are mostly used
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Question 8 of 20
8. Question
1 pointsThe reheat factor depends upon
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Question 9 of 20
9. Question
1 pointsIn an impulse turbine
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Question 10 of 20
10. Question
1 pointsA nozzle is said to be a divergent nozzle
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Question 11 of 20
11. Question
1 pointsThe compounding of turbines is done in order to
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Question 12 of 20
12. Question
1 pointsThe process of maintaining the speed of the turbine constant for various load conditions, is known as
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Question 13 of 20
13. Question
1 pointsReheating of steam in a turbine
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Question 14 of 20
14. Question
1 pointsWhich of the following statement is correct for steam turbines as compared to reciprocating steam engines?
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Question 15 of 20
15. Question
1 pointsThe density of supersaturated steam is about __________ that of the ordinary saturated vapour at the corresponding pressure.
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Question 16 of 20
16. Question
1 pointsThe ratio of the workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam is called
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Question 17 of 20
17. Question
1 pointsThe diagram efficiency is the ratio of
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Question 18 of 20
18. Question
1 pointsBlading efficiency is also known as
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Question 19 of 20
19. Question
1 pointsIn order to reduce the rotor speed of an impulse turbine, the method employed is
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Question 20 of 20
20. Question
1 pointsThe nozzle efficiency is the ratio of
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Steam Nozzles and Turbines MCQ 4
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Question 1 of 20
1. Question
1 pointsIn a reaction turbine
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Question 2 of 20
2. Question
1 pointsA stage, in reaction turbine, is represented by
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Question 3 of 20
3. Question
1 pointsWhen the nozzle operates with the maximum mass flow, the nozzle is said to be
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Question 4 of 20
4. Question
1 pointsIn a velocity compounded impulse turbine, when steam flows through the second row of moving blades,
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Question 5 of 20
5. Question
1 pointsA steam nozzle converts
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Question 6 of 20
6. Question
1 pointsSteam turbines may be classified according to
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Question 7 of 20
7. Question
1 pointsThe process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as
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Question 8 of 20
8. Question
1 pointsIn a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be
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Question 9 of 20
9. Question
1 pointsIn an impulse turbine, steam expands
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Question 10 of 20
10. Question
1 pointsIn a nozzle, the effect of supersaturation is to
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Question 11 of 20
11. Question
1 pointsWhich of the following statement is correct?
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Question 12 of 20
12. Question
1 pointsIf the critical pressure ratio for steam is 0.546, then the steam is initially
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Question 13 of 20
13. Question
1 pointsWhich of the following statement is wrong?
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Question 14 of 20
14. Question
1 pointsIn a reaction turbine when the degree of reaction is zero, then there is
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Question 15 of 20
15. Question
1 pointsIn an ideal impulse turbine, the
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Question 16 of 20
16. Question
1 pointsIn a reaction turbine, when steam flows through the moving blades,
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Question 17 of 20
17. Question
1 pointsA steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as
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Question 18 of 20
18. Question
1 pointsStage efficiency is also known as
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Question 19 of 20
19. Question
1 pointsIn turbines, the fluid undergoes a continuous steady flow process and the speed of flow is
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Question 20 of 20
20. Question
1 pointsIn an impulse reaction turbine, the pressure drops gradually and continuously over
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