Engineering Thermodynamics MCQs

Question 1

The term N.T.P. stands for

Accepted Answer

Normal temperature and pressure

Answer

Nominal temperature and pressure

Answer

Natural temperature and pressure

Answer

Normal thermodynamic practice

Question 2

First law of thermodynamics deals with

Accepted Answer

Conservation of energy

Answer

Conservation of heat

Answer

Conservation of momentum

Answer

Conservation of mass

Question 3

The value of n = 1 in the polytropic process indicates it to be

Accepted Answer

Isothermal process

Answer

Reversible process

Answer

Adiabatic process

Answer

Irreversible process

Question 4

The general gas energy equation is (where $${{	ext{Q}}_{1 - 2}}$$ = Heat supplied, dU = Change in internal energy and $${{	ext{W}}_{1 - 2}}$$ = Work done in heat units)

Accepted Answer

$${{	ext{Q}}_{1 - 2}} = {	ext{dU}} + {{	ext{W}}_{1 - 2}}$$

Answer

$${{	ext{Q}}_{1 - 2}} = {	ext{dU}} - {{	ext{W}}_{1 - 2}}$$

Answer

$${{	ext{Q}}_{1 - 2}} = \frac{{{	ext{dU}}}}{{{{	ext{W}}_{1 - 2}}}}$$

Answer

$${{	ext{Q}}_{1 - 2}} = {	ext{dU}} 	imes {{	ext{W}}_{1 - 2}}$$

Question 5

Otto cycle consists of following four processes

Accepted Answer

Two isentropic and two constant volumes

Answer

Two isothermal and two isentropic

Answer

Two isentropic, one constant volume and one constant pressure

Answer

Two isentropic and two constant pressures

Question 6

Diesel cycle consists of following four processes

Accepted Answer

Two isentropic, one constant volume and one constant pressure

Answer

Two isothermal and two isentropic

Answer

Two isentropic and two constant volumes

Answer

Two isentropic and two constant pressures

Question 7

Brayton cycle consist's of following four processes

Accepted Answer

Two isentropic and two constant pressures

Answer

Two isothermal and two isentropic

Answer

Two isentropic and two constant volumes

Answer

Two isentropic, one constant volume and one constant pressure

Question 8

When coal is first dried and then crushed to a fine powder by pulverizing machine, the resulting fuel is called

Accepted Answer

None of these

Answer

Wood charcoal

Answer

Bituminous coal

Answer

Briquetted coal

Question 9

For reversible adiabatic process, change in entropy is

Accepted Answer

Zero

Answer

Maximum

Answer

Minimum

Answer

Negative