Q.1

The efficiency of Stirling cycle is __________ Carnot cycle.

  • greater than
  • less than
  • equal to
Q.2

The kinetic energy of molecules of a gas becomes zero at absolute zero temperature.

  • Agree
  • Disagree
Q.3

Stirling and Ericsson cycles are

  • reversible cycles
  • irreversible cycles
  • semi-reversible cycles
  • quasi-static cycles
Q.4

One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.

  • 8/3
  • 11/3
  • 11/7
  • 7/3
Q.5

Which of the following is correct?

  • Absolute pressure = Gauge pressure + Atmospheric pressure
  • Gauge pressure = Absolute pressure + Atmospheric pressure
  • Atmospheric pressure = Absolute pressure + Gauge pressure
  • Absolute pressure = Gauge pressure - Atmospheric pressure
Q.6

The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

  • cracking
  • carbonisation
  • fractional distillation
  • full distillation
Q.7

The entropy __________ in an irreversible cyclic process.

  • remains constant
  • decreases
  • increases
Q.8

According to Gay-Lussac law for a perfect gas, p/T = constant, if v is kept constant.

  • True
  • False
Q.9

One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.

  • All
  • 4/7
  • 11/4
  • 9/7
Q.10

When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

  • zero
  • 1/5
  • 4/5
  • 1
Q.11

The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

  • Boyle's law
  • Charles' law
  • Gay-Lussac law
  • all of these
Q.12

Which of the following statement is incorrect?

  • The liquid fuels consist of hydrocarbons.
  • The liquid fuels have higher calorific value than solid fuels.
  • The solid fuels have higher calorific value than liquid fuels.
  • A good fuel should have low ignition point.
Q.13

The atomic mass of oxygen is

  • 12
  • 14
  • 16
  • 32
Q.14

There is no change in internal energy in an isothermal process.

  • Correct
  • Incorrect
Q.15

The absolute zero temperature is taken as

  • -273°C
  • 273°C
  • 237°F
  • -237°F
Q.16

A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as

  • reversible cycle
  • irreversible cycle
  • thermodynamic cycle
  • none of these
Q.17

The universal gas constant of a gas is the product of molecular mass of the gas and the gas constant.

  • Correct
  • Incorrect
Q.18

The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is

  • equal to one
  • less than one
  • greater than one
  • none of these
Q.19

If the value of n = 0 in the equation pvn = C, then the process is called

  • constant volume process
  • adiabatic process
  • constant pressure process
  • isothermal process
Q.20

The specific heat of water is

  • 1.817
  • 2512
  • 4.187
  • none of these
Q.21

An isothermal process is governed by

  • Boyle's law
  • Charles' law
  • Gay-Lussac law
  • Avogadro's law
Q.22

The processes occuring in open system which permit the transfer of mass to and from the system, are known as

  • flow processes
  • non-flow processes
  • adiabatic processes
  • none of these
Q.23

Which of the following gas is mostly used in town for street and domestic lighting and heating?

  • Producer gas
  • Coal gas
  • Mond gas
  • Coke oven gas
Q.24

An adiabatic process is one in which

  • no heat enters or leaves the gas
  • the temperature of the gas changes
  • the change in internal energy is equal to the mechanical workdone
  • all of the above
Q.25

All the commercial liquid fuels are derived from natural petroleum (or crude oil).

  • True
  • False
Q.26

Which of the following has the minimum atomic mass?

  • Oxygen
  • Sulphur
  • Nitrogen
  • Carbon
Q.27

The value of gas constant (R) in S. I. units is

  • 0.287 J/kgK
  • 2.87 J/kgK
  • 28.7 J/kgK
  • 287 J/kgK
Q.28

Water gas is obtained by passing air and a large amount of steam over waste coal at about 650°C.

  • Correct
  • Incorrect
Q.29

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

  • Carnot cycle
  • Stirling cycle
  • Otto cycle
  • Diesel cycle
Q.30

Workdone in a free expansion process is

  • zero
  • minimum
  • maximum
  • positive
0 h : 0 m : 1 s