Basic Mechanical Engineering (3110006) MCQs

MCQs of Heat Engines

Showing 1 to 10 out of 18 Questions
1 2
1.
Otto cycle used in petrol engines is also known as
(a) constant pressure cycle
(b) constant volume cycle
(c) constant temperature cycle
(d) none of the above
Answer:

Option (b)

2.

The air standard Otto cycle consists of

(a)

two constant pressure processes and two constant volume processes
(b)

two constant pressure and two adiabatic processes
(c)

two constant volume processes and two adiabatic processes
(d)

none of the above
Answer:

Option (c)

3.
In the Otto cycle, heat addition takes place at
(a) constant temperature
(b) constant pressure
(c) constant volume
(d) none of the mentioned
Answer:

Option (c)

4.
The thermal efficiency of theoretical Otto cycle
(a) decreases with an increase in compression ratio
(b) increases with a decrease in compression ratio
(c) does not depend upon the pressure ratio
(d) none of the mentioned
Answer:

Option (c)

5.
The efficiency of an Otto cycle is increased by increasing
(a) pressure ratio
(b) compression ratio
(c) temperature ratio
(d) none of the mentioned
Answer:

Option (b)

6.
The air standard cycle on which the petrol engine work is
(a) Otto cycle
(b) Carnot cycle
(c) Joule cycle
(d) Dual cycle
Answer:

Option (a)

7.
A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
(a) Carnot cycle
(b) Rankine cycle
(c) Otto cycle
(d) Diesel cycle
Answer:

Option (d)

8.
In the Diesel cycle, heat supplied and heat rejection are takes place respectively in
(a) one at constant pressure process and one at constant volume process
(b) constant pressure process
(c) isothermal processes
(d) constant volume processes
Answer:

Option (a)

9.
The constant pressure cycle is also known as
(a) Otto cycle
(b) Carnot cycle
(c) Diesel cycle
(d) Rankine cycle
Answer:

Option (c)

10.
The efficiency of the Diesel cycle depends upon
(a) temperature limits
(b) pressure ratio
(c) compression ratio
(d) cut-off ratio and compression ratio
Answer:

Option (d)

Showing 1 to 10 out of 18 Questions
1 2