Engineering Thermodynamics (3131905) MCQs

MCQs of Vapor Power Cycles

Showing 21 to 30 out of 35 Questions
1 2 3 4
21.

The cycle efficiency ________________ with the _____________ of condenser pressure.

(a)

decreases, decrease
(b)

increases, decrease
(c)

remains same, decrease
(d)

does not vary, decrease
Answer:

Option (b)

22.

Ideal regenerative rankine cycle _______.

(a)

increases efficiency
(b)

increases work output
(c)

increases the heat supplied
(d)

does not effect efficiency
Answer:

Option (a)

23.

The mean temperature of heat addition is _______ due to regeneration.

(a)

decreases
(b)

not effected
(c)

increases
(d)

varied exponentially
Answer:

Option (c)

24.

What is the effect of increase in regeneration on steam rate?

(a)

steam rate increases
(b)

steam rate decreases
(c)

steam rate is independent of regeneration
(d)

none of the mentioned
Answer:

Option (a)

25.

In Carnot vapour cycle phase of working fluid after condenser is

(a)

liquid only
(b)

vapour only
(c)

mixture of liquid and vapour
(d)

all of these
Answer:

Option (c)

26.

The Rankine cycle, as compared to carnot cycle has ___________work ratio.

(a)

same
(b)

low
(c)

high
(d)

all of these
Answer:

Option (c)

27.

The thermal efficiency of regenerative feed heating cycle is

(a)

same as simple Rankine cycle thermal efficiency
(b)

less than simple Rankine cycle thermal efficiency
(c)

greater than simple Rankine cycle thermal efficiency
(d)

none of these
Answer:

Option (c)

28.

The efficiency of Rankine cycle increasing with

(a)

superheating of steam
(b)

increasing boiler pressure
(c)

reducing condenser pressure
(d)

all of these
Answer:

Option (d)

29.

In regenerative feed heating cycle, feed water is heated by,

(a)

extracted steam from turbine
(b)

exhaust gases from boiler
(c)

heaters
(d)

all of these
Answer:

Option (a)

30.

In regenerative feed heating cycle, the greatest efficiency can be obtained

(a)

when steam is extracted only from last stage of steam turbine
(b)

when steam is extracted only from first stage of steam turbine
(c)

when steam is extracted only one suitable point of steam turbine
(d)

when steam is extracted from several places in different stages of steam turbine
Answer:

Option (d)

Showing 21 to 30 out of 35 Questions
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