Q.1

The fuel mostly used in steam boilers is

  • brown coal
  • peat
  • coking bituminous coal
  • non-coking bituminous coal
Q.2

As per Charles' law, the volume of a given mass of a perfect gas varies __________ as its absolute temperature, when the absolute pressure remains constant.

  • directly
  • indirectly
Q.3

The unit of energy is S. I. units is

  • Joule (J)
  • Joule metre (Jm)
  • Watt(W)
  • Joule/metre (J/m)
Q.4

The greater the pressure difference in throttling, the lesser is the irreversibility.

  • Yes
  • No
Q.5

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

  • Isothermal expansion
  • Isentropic expansion
  • Isothermal compression
  • Isentropic compression
Q.6

As per Charles' law, the volume of a given mass of a perfect gas varies __________ as its absolute temperature, when the absolute pressure remains constant.

  • directly
  • indirectly
Q.7

The efficiency of Joule cycle is

  • greater than Carnot cycle
  • less than Carnot cycle
  • equal to Carnot cycle
  • none of these
Q.8

The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.

  • Agree
  • Disagree
Q.9

The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.

  • Agree
  • Disagree
Q.10

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

  • combustion is at constant volume
  • expansion and compression are isentropic
  • maximum temperature is higher
  • heat rejection is lower
Q.11

The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)

  • Q1 - 2 = dU + W1 - 2
  • Q1 - 2 = dU - W1 - 2
  • Q1 - 2 = dU/W1 - 2
  • Q1 - 2 = dU x W1 - 2
Q.12

One kg of carbon produces __________ kg of carbon dioxide.

  • 3/7
  • 7/3
  • 11/3
  • 3/11
Q.13

Which is the incorrect statement about Carnot cycle?

  • It is used as the alternate standard of comparison of all heat engines.
  • All the heat engines are based on Carnot cycle.
  • It provides concept of maximising work output between the two temperature limits.
  • all of the above
Q.14

Liquid fuels have higher calorific value than solid fuels.

  • Yes
  • No
Q.15

Hydrogen is the __________ substance.

  • lightest
  • heaviest
Q.16

The compression ratio for Diesel engines is

  • 3 to 6
  • 5 to 8
  • 15 to 20
  • 20 to 30
Q.17

Ericsson cycle consists of two constant pressure and two isothermal processes.

  • Agree
  • Disagree
Q.18

When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

  • Zeroth law of thermodynamics
  • First law of thermodynamics
  • Second law of thermodynamics
  • Kelvin Planck's law
Q.19

The free expansion process is __________ non-flow process.

  • reversible
  • irreversible
Q.20

According to kinetic theory of gases, the kinetic energy of translation of a molecule is proportional to

  • T
  • T
  • 1/T
  • 1/T
Q.21

Otto cycle is also known as

  • constant pressure cycle
  • constant volume cycle
  • constant temperature cycle
  • constant temperature and pressure cycle
Q.22

In an isothermal process,

  • there is no change in temperature
  • there is no change in enthalpy
  • there is no change in internal energy
  • all of these
Q.23

The isothermal and isentropic processes are reversible non-flow processes.

  • Agree
  • Disagree
Q.24

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

  • heat absorbed
  • heat rejected
  • either (a) or (b)
  • none of these
Q.25

A mixture of gas expands from 0.m3 to 0.m3 at a constant pressure of 1 MPa and absorbskJ of heat during the process. The change in internal energy of the mixture is

  • 30 kJ
  • 54 kJ
  • 84 kJ
  • 114 kJ
Q.26

The amount of heat given out by the complete combustion of 1 kg of fuel is known as calorific value of solid or liquid fuel.

  • True
  • False
Q.27

For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)

  • 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.28

The area under the temperature-entropy curve (i. e. T - s curve) of any thermodynamic process represents the workdone during the process.

  • Agree
  • Disagree
Q.29

The ratio of molar specific heats for monoatomic gas is

  • 1
  • 1.4
  • 1.67
  • 1.87
Q.30

Which of the following is the correct statement of the 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 impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.
  • There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.
  • all of the above
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