Engineering Thermodynamics (3131905) MCQs

MCQs of Vapor Power Cycles

Showing 1 to 10 out of 35 Questions
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1.

Thermal power plant work on

(a)

Carnot cycle
(b)

Joule cycle
(c)

Rankine cycle
(d)

Otto cycle
Answer:

Option (c)

2.

In a Rankine Cycle, heat input is provided to ___________.

(a)

Condenser
(b)

Pump
(c)

Turbine
(d)

Boiler
Answer:

Option (d)

3.

In a Rankine Cycle, heat output is obtained from ___________.

(a)

condenser
(b)

boiler
(c)

turbine
(d)

pump
Answer:

Option (a)

4.

Which of these is sometimes neglected?

(a)

Turbine work
(b)

Pump work
(c)

Condenser heat
(d)

Boiler heat
Answer:

Option (b)

5.

The net work done in a Rankine Cycle is the difference of 

(a)

condenser work & boiler work
(b)

boiler work & pump work
(c)

turbine Work & pump work
(d)

condenser work & pump work
Answer:

Option (c)

6.

The efficiency of a Rankine cycle may be expected to

(a)

increase with decreasing temperature of heat rejection
(b)

decrease with increasing temperature of heat rejection
(c)

decrease with decreasing temperature of heat rejection
(d)

increase with increasing exhaust pressure
Answer:

Option (a)

7.

A Rankine cycle working with saturated steam differs thermodynamically from a Carnot cycle only in the fact that

(a)

The Carnot cycle cannot be used for vapour
(b)

There are more than two sources of heat in Rankine cycle
(c)

Steam is not the working substance for Carnot cycle
(d)

Heat is supplied to the water at temperatures below the maximum temperature of the cycle
Answer:

Option (d)

8.

Rankine cycle efficiency for a power plant is 29.6%. The Carnot cycle efficiency will be

(a)

Equal to Rankine cycle efficiency
(b)

Less than Rankine cycle efficiency
(c)

More than Rankine cycle efficiency
(d)

There is no comparison for the two
Answer:

Option (b)

9.

The number of processes in a Rankine cycle is

(a)

two
(b)

four
(c)

three
(d)

five
Answer:

Option (b)

10.

Rankine cycle operating on given condenser pressure (lower limit) and boiler pressure (upper limit)

(a)

has higher thermal efficiency than the Carnot cycle operating between same pressure limits
(b)

has lower thermal efficiency than Carnot cycle operating between same pressure limits
(c)

has same thermal efficiency as Carnot cycle operating between same pressure limits
(d)

may be more or less depending upon the magnitudes of p1 and p2
Answer:

Option (a)

Showing 1 to 10 out of 35 Questions
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