Q.1

It is __________ to make an engine working on a Carnot cycle.

  • possible
  • impossible
Q.2

Which of the following statement is correct?

  • The heat and work are boundary phenomena
  • The heat and work represent the energy crossing the boundary of the system
  • The heat and work are path functions
  • all of the above
Q.3

The atomic mass of sulphur is

  • 12
  • 14
  • 16
  • 32
Q.4

The ideal efficiency of simple gas turbine cycle depends upon pressure ratio.

  • Yes
  • No
Q.5

The universal gas constant (or molar constant) of a gas is the product of

  • molecular mass of the gas and the gas constant
  • atomic mass of the gas and the gas constant
  • molecular mass of the gas and the specific heat at constant pressure
  • molecular mass of the gas and the specific heat at constant volume
Q.6

The mass of flue gas per kg of fuel is the ratio of the

  • mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel
  • mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas
  • mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
  • mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas
Q.7

If in the equation pvn = C, the value of n = ∝ , then the process is called

  • constant volume process
  • adiabatic process
  • constant pressure process
  • isothermal process
Q.8

A machine which violates the first law of thermodynamics is known as perpetual motion machine of the second kind.

  • Correct
  • Incorrect
Q.9

A cycle consisting of two constant pressure and two isentropic processes is known as

  • Carnot cycle
  • Stirling cycle
  • Otto cycle
  • none of these
Q.10

One kilowatt is equal to

  • 1 N-m/s
  • 100 N-m
  • 1000 N-m/s
  • 1 x 106 N-m/s
Q.11

The process is adiabatic, if the value of n in the equation pvn = C, is

  • 0
  • 1
  • γ
  • ∝
Q.12

In an ideal gas turbine plant, it is assumed that the compression and expansion processes are

  • isothermal
  • isentropic
  • polytropic
  • none of these
Q.13

In an ideal gas turbine plant, it is assumed that the compression and expansion processes are

  • isothermal
  • isentropic
  • polytropic
  • none of these
Q.14

The efficiency of the Carnot cycle may be increased by

  • increasing the highest temperature
  • decreasing the highest temperature
  • increasing the lowest temperature
  • keeping the lowest temperature constant
Q.15

The ultimate analysis of coal consists of the determination of the percentage of

  • carbon
  • hydrogen and nitrogen
  • sulphur and ash
  • all of these
Q.16

For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order

  • Dual cycle, Diesel cycle, Otto cycle
  • Otto cycle, Diesel cycle, Dual cycle
  • Dual cycle, Otto cycle, Diesel cycle
  • Diesel cycle, Otto cycle, Dual cycle
Q.17

The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)

  • Ru x T
  • 1.5 Ru x T
  • 2 Ru x T
  • 3 Ru x T
Q.18

Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, γ = cp/cv, known as adiabatic index, and R = Gas constant)

  • cp - cv = R
    240-90-2.png
  • Both (B) and (C)
Q.19

The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)

  • Ru x T
  • 1.5 Ru x T
  • 2 Ru x T
  • 3 Ru x T
Q.20

The heating of a gas at constant pressure is governed by

  • Boyle's law
  • Charles' law
  • Gay-Lussac law
  • Avogadro's law
Q.21

In S. I. units, the value of the universal gas constant is

  • 8.314 J/kg mole-K
  • 83.14 J/kgmole-K
  • 831.4 J/kgmole-K
  • 8314 J/kgmole-K
Q.22

A molecule consisting of one atom is known as

  • monoatomic
  • diatomic
  • triatomic
  • polyatomic
Q.23

A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called

  • isothermal process
  • hyperbolic process
  • adiabatic process
  • polytropic process
Q.24

Both the Ericsson and Joule's cycle have two constant pressure processes.

  • True
  • False
Q.25

When the gas is heated at constant pressure, the heat supplied

  • increases the internal energy of the gas
  • increases the temperature of the gas
  • does some external work during expansion
  • Both (B) and (C)
Q.26

Second law of thermodynamics defines

  • heat
  • work
  • internal energy
  • entropy
Q.27

When gas is heated at constant pressure, the heat supplied is utilised in

  • increasing the internal energy of gas
  • doing some external work
  • increasing the internal energy of gas and also for doing some external work
  • none of the above
Q.28

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

  • Yes
  • No
Q.29

The atomic mass of nitrogen is __________ oxygen.

  • equal to
  • less than
  • more than
Q.30

Reversed Joule cycle is known as

  • Carnot cycle
  • Bell-Coleman cycle
  • Rankine cycle
  • Stirling cycle
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