Q.1

The efficiency of Diesel cycle depends upon

  • temperature limits
  • pressure ratio
  • compression ratio
  • cut-off ratio and compression ratio
Q.2

According to Kelvin-Planck's statement of second law of thermodynamics,

  • it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
  • it is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
  • it is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
  • none of the above
Q.3

For the same compression ratio, the efficiency of dual combustion cycle is

  • greater than Diesel cycle and less than Otto cycle
  • less than Diesel cycle and greater than Otto cycle
  • greater than Diesel cycle
  • less than Diesel cycle
Q.4

Which of the following gas has the highest calorific value?

  • Coal gas
  • Producer gas
  • Mond gas
  • Blast furnace gas
Q.5

For the same maximum pressure and temperature,

  • Otto cycle is more efficient than Diesel cycle
  • Diesel cycle is more efficient than Otto cycle
  • Dual cycle is more efficient than Otto and Diesel cycles
  • Dual cycle is less efficient than Otto and Diesel cycles
Q.6

Those substances which have so far not been resolved by any means into other substances of simpler form are called

  • elements
  • compounds
  • atoms
  • molecules
Q.7

According to Gay-Lussac law, the absolute pressure of a given mass of a perfect gas varies __________ as its absolute temperature, when the volume remains constant.

  • directly
  • indirectly
Q.8

In an irreversible process, there is a

  • loss of heat
  • no loss of heat
  • gain of heat
  • no gain of heat
Q.9

The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

  • law of equipartition of energy
  • law of conservation of energy
  • law of degradation of energy
  • none of these
Q.10

The oxygen atom is __________ times heavier than the hydrogen atom.

  • 2
  • 4
  • 8
  • 16
Q.11

In a steady flow process, the rate of

  • heat transfer is constant
  • work transfer is constant
  • mass flow at inlet and outlet is same
  • all of these
Q.12

Liquid fuels have lower efficiency than solid fuels.

  • True
  • False
Q.13

The hyperbolic pocess is governed by

  • Boyle's law
  • Charles' law
  • Gay-Lussac law
  • Avogadro's law
Q.14

The measurement of a thermodynamic property known as temperature is based on

  • Zeroth law of thermodynamics
  • First law of thermodynamics
  • Second law of thermodynamics
  • none of these
Q.15

According to Avogadro's law

  • the product of the gas constant and the molecular mass of an ideal gas is constant
  • the sum of partial pressure of the mixture of two gases is sum of the two
  • equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules
  • all of the above
Q.16

The amount of heat required to raise the temperature of unit mass of a gas through one degree at constant pressure is called specific heat at constant pressure.

  • True
  • False
Q.17

The thermodynamic property of a system is said to be an intensive property whose value for the entire system __________ the sum of their value for the individual parts of the system.

  • is equal to
  • is not equal to
Q.18

When the gas is cooled at constant pressure,

  • its temperature increases but volume decreases
  • its volume increases but temperature decreases
  • both temperature and volume increases
  • both temperature and volume decreases
Q.19

The entropy of the universe is continually on the increase.

  • Correct
  • Incorrect
Q.20

A closed system is one in which heat and work crosses the boundary of the system but the mass of the working substance does not crosses the boundary of the system.

  • Yes
  • No
Q.21

Kelvin-Planck's law deals with

  • conservation of work
  • conservation of heat
  • conversion of heat into work
  • conversion of work into heat
Q.22

A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

  • isothermal process
  • hyperbolic process
  • adiabatic process
  • polytropic process
Q.23

The change of entropy, when heat is removed from the gas, is negative.

  • Yes
  • No
Q.24

The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the temperature remains constant. This statement is known as Charles' law.

  • Yes
  • No
Q.25

Select the correct statement as per Charles' law

  • p.v = constant, if T is kept constant
  • v/T = constant, if p is kept constant
  • p/T = constant, if v is kept constant
  • T/p = constant, if v is kept constant
Q.26

Liquid fuels consist of hydrocarbons.

  • True
  • False
Q.27

The entropy of water at 0°C is assumed to be

  • 1
  • 0
  • -1
  • 10
Q.28

Liquid fuels consist of hydrocarbons.

  • True
  • False
Q.29

Which of the following gas has a minimum molecular mass?

  • Oxygen
  • Nitrogen
  • Hydrogen
  • Methane
Q.30

Coke is produced

  • when coal is first dried and then crushed to a fine powder by pulverising machine
  • from the finely ground coal by moulding under pressure with or without a binding material
  • when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
  • by heating wood with a limited supply of air to a temperature not less than 280°C
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