Basic Mechanical Engineering (3110006) MCQs

MCQs of Heat Engines

Showing 11 to 18 out of 18 Questions
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11.
The efficiency of Diesel cycle approaches to Otto cycle efficiency when
(a) cut-off is increased
(b) cut-off is decreased
(c) cut-off is zero
(d) cut-off is constant
Answer:

Option (c)

12.

The processes of the Carnot cycle are

(a)

two adiabatic and two constant volume
(b)

two constant pressure and two constant volume
(c)

two isothermal and two adiabatic
(d)

two isothermal and two constant volume
Answer:

Option (c)

13.
During which of the following process does heat rejection takes place in the Carnot cycle?
(a) Isothermal expansion
(b) Isothermal compression
(c) Isentropic expansion
(d) Isothermal compression
Answer:

Option (b)

14.
The efficiency of the Diesel cycle increases with
(a) decrease in cut-off
(b) increase in cut-off
(c) constant cut-off
(d) none of these
Answer:

Option (a)

15.
Rankine cycle is applied for
(a) steam engine
(b) petrol engine
(c) steam power plant
(d) diesel engine
Answer:

Option (c)

16.
Rankine cycle comprises of
(a) two isentropic processes and two constant volume processes
(b) two isentropic processes and two constant pressure processes
(c) two isothermal processes and two constant pressure processes
(d) none of the mentioned
Answer:

Option (b)

17.
For the same compression ratio, the thermal efficiency of the Otto cycle is
(a) greater than Diesel cycle
(b) less than Diesel cycle
(c) equal to Diesel cycle
(d) none of the above
Answer:

Option (a)

18.
The cut-off ratio is related to
(a) Carnot cycle
(b) Otto cycle
(c) Diesel cycle
(d) Rankine cycle
Answer:

Option (c)

Showing 11 to 18 out of 18 Questions
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