Engineering Thermodynamics (3131905) MCQs

MCQs of Gas Power Cycles

Showing 1 to 10 out of 37 Questions
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1.

During which of the following process does heat rejection takes place in Carnot cycle?

(a)

isothermal expansion
(b)

isentropic expansion
(c)

isothermal compression
(d)

isentropic compression
Answer:

Option (c)

2.

Carnot cycle has maximum efficiency for

(a)

petrol engine
(b)

diesel engine
(c)

reversible engine
(d)

irreversible engine
Answer:

Option (c)

3.

The efficiency of the Carnot cycle may be increased by

(a)

increasing the highest temperature
(b)

decreasing the highest temperature
(c)

increasing the lowest temperature
(d)

keeping the lowest temperature constant
Answer:

Option (a)

4.

Which is the incorrect statement about Carnot cycle?

(a)

It is used as the alternate standard of comparison of all heat engines.
(b)

All the heat engines are based on Carnot cycle.
(c)

It provides concept of maximizing work output between the two temperature limits.
(d)

all of these
Answer:

Option (b)

5.

The area under the temperature-entropy curve (T - s curve) of any thermodynamic process represents

(a)

heat absorbed
(b)

heat rejected
(c)

either heat absorbed or rejected
(d)

none of these
Answer:

Option (c)

6.

Otto cycle is also known as

(a)

constant pressure cycle
(b)

constant volume cycle
(c)

constant temperature cycle
(d)

constant temperature and pressure cycle
Answer:

Option (b)

7.

A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

(a)

Carnot cycle
(b)

Stirling cycle
(c)

Otto cycle
(d)

Diesel cycle
Answer:

Option (c)

8.

Diesel cycle consists of __________ processes.

(a)

two constant volume and two isentropic
(b)

two constant pressure and two isentropic
(c)

two constant volume and two isothermal
(d)

one constant pressure, one constant volume and two isentropic
Answer:

Option (d)

9.

Otto cycle efficiency is higher than Diesel cycle for the same compression ratio and heat input because in Otto cycle

(a)

combustion is at constant volume
(b)

expansion and compression are isentropic
(c)

maximum temperature is higher
(d)

heat rejection is lower
Answer:

Option (d)

10.

For the same compression ratio, the efficiency of Diesle cycle is_____________Otto cycle.

(a)

greater than
(b)

less than
(c)

equal to
(d)

none of these
Answer:

Option (b)

Showing 1 to 10 out of 37 Questions
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