Engineering :: Heat Engines
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361. |
In a impulse turbine while steam flows through the moving blades |
A. |
Velocity reduces |
B. |
Velocity increases |
C. |
Pressure reduces |
D. |
Velocity reduces while pressure increases |
E. |
Both velocity as well as pressure increase |
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Answer: Option A
Explanation:
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362. |
The processes in a Rankine cycle are |
A. |
Two isothermal and two isentropic |
B. |
Two isothermal and two polytropic |
C. |
Two isothermal and two isobaric |
D. |
One constant pressure, one constant volume and two polytropic |
E. |
None of the above |
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Answer: Option E
Explanation:
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363. |
In a throttle governed steam engine |
A. |
Admission pressure is reduced while cut off remains unaltered |
B. |
Admission pressure is varied while cut off remains unaltered |
C. |
Admission pressure remains constant while cut off is altered |
D. |
Admission pressure and cut off both are altered |
E. |
Neither admission pressure nor cut off is altered |
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Answer: Option B
Explanation:
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364. |
In a cut off covered steam engine |
A. |
Admission pressure is increased while cut off remains unaltered |
B. |
Admission pressure is reduced while cut off remains unaltered |
C. |
Admission pressore remains constant while cut off is varied |
D. |
Admission pressure and cut off both are varied |
E. |
Neither admission pressure nor cut off is varied |
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Answer: Option C
Explanation:
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365. |
In a reaction turbine while steam flows through the fixed blades |
A. |
Velocity increases |
B. |
Pressure increases |
C. |
Velocity decreases |
D. |
Velocity increases while pressure drops |
Answer: Option D
Explanation:
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366. |
In case of pressure compounded impulse turbine, for the steam while flowing through the nozzle of second stage |
A. |
Pressure increases |
B. |
Pressure and velocity both increase |
C. |
Pressure and velocity both decrease |
D. |
Pressure increases while velocity decreases |
E. |
Pressure drops while velocity increases |
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Answer: Option E
Explanation:
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367. |
Reheating of steam for steam turbine cycle is done primarily to |
A. |
Reduce dryness fraction of exhaust steam |
B. |
Increase the pressure of steam in the condenser |
C. |
Increase boiler chimney draught |
D. |
Improve thermal efficiency of the plant |
E. |
All of the above |
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Answer: Option D
Explanation:
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368. |
The term regeneration is closely associated with |
A. |
Steam engines |
B. |
Steam turbines |
C. |
Diesel engines |
D. |
Gas engines |
E. |
Wankel engines |
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Answer: Option B
Explanation:
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369. |
During regenerative feed heating |
A. |
Part of the steam is generated in turbine |
B. |
Condenser is supplied with dry and staturated steam |
C. |
Part of the steam is bled from turbine for feed water heating |
D. |
High pressure steam is used to heat low pressure steam coming out of the turbine after expansion |
E. |
None of the above |
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Answer: Option C
Explanation:
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370. |
In regenerative feed heating system the steam 'bled' from turbine exchanges heat with |
A. |
High pressure steam coming from boiler |
B. |
Air for preheating |
C. |
Fuel for preheating |
D. |
Feed water for boiler |
E. |
All of the above |
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Answer: Option D
Explanation:
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