Q.1

The absolute zero pressure will be

  • when molecular momentum of the system becomes zero
  • at sea level
  • at the temperature of - 273 K
  • at the centre of the earth
Q.2

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

  • increases the internal energy of the gas and increases the temperature of the gas
  • does some external work during expansion
  • Both (A) and (B)
  • None of these
Q.3

In open cycle gas turbine plants

  • the indirect heat exchanger and cooler is avoided
  • direct combustion system is used
  • a condenser is used
  • all of the above
Q.4

To ensure complete and rapid combustion of a fuel, some quantity of air, in excess of the theoretical or minimum air is supplied.

  • Yes
  • No
Q.5

When a gas is heated at constant pressure

  • its temperature will increase
  • its volume will increase
  • both temperature and volume will increase
  • neither temperature not volume will increase
Q.6

The heating of gas at constant volume is governed by

  • Boyle's law
  • Charles' law
  • Gay-Lussac law
  • Avogadro's law
Q.7

The entropy may be expressed as a function of

  • pressure and temperature
  • temperature and volume
  • heat and work
  • all of these
Q.8

The reading of the pressure gauge fitted on a vessel isbar. The atmospheric pressure is 1.bar and the value of 'g' is 9.m/s2. The absolute pressure in the vessel is

  • 23.97 bar
  • 25 bar
  • 26.03 bar
  • 34.81 bar
Q.9

One kg of hydrogen requires 8 kg of oxygen and produces

  • 1 kg of water
  • 7 kg of water
  • 8 kg of water
  • 9 kg of water
Q.10

One kg of ethylene (C2H4) requires 2 kg of oxygen and produces 22/7 kg of carbon dioxide and __________ kg of water or steam.

  • 9/7
  • 11/7
  • 7/4
  • 11/4
Q.11

The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by

  • Kelvin
  • Joule
  • Clausis
  • Gay-Lussac
Q.12

Kerosene is distilled at

  • 65° to 220°C
  • 220° to 345°C
  • 345° to 470°C
  • 470° to 550°C
Q.13

The behaviour of super-heated vapour is similar to that of

  • perfect gas
  • air
  • steam
  • ordinary gas
Q.14

Which of the following statement is correct according to Clausis statement of second law off thermodynamics?

  • It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
  • It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
  • It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
  • none of the above
Q.15

Wood charcoal is produced by heating the wood at 100°C.

  • Yes
  • No
Q.16

A process, in which the gas is heated or expanded in such a way that product of its pressure and volume remains constant, is called isothermal process.

  • Yes
  • No
Q.17

The workdone in a free expansion process is zero.

  • True
  • False
Q.18

According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) __________ with the change in pressure and temperature of the gas.

  • change
  • do not change
Q.19

Coal gas consists mainly of hydrogen, carbon monoxide and various hydrocarbons.

  • Agree
  • Disagree
Q.20

When a perfect gas is expanded through an aperture of minute dimensions, the process is known as

  • isothermal process
  • adiabatic process
  • free expansion process
  • throttling process
Q.21

The calorific value of gaseous fuel is expressed in

  • kJ
  • kJ/kg
  • kJ/m2
  • kJ/m3
Q.22

A good fuel should have __________ ignition point.

  • high
  • low
Q.23

The gas in cooling chamber of a closed cycle gas turbine is cooled at

  • constant volume
  • constant temperature
  • constant pressure
  • none of these
Q.24

By decreasing the highest temperature in the Carnot cycle, its efficiency is increased.

  • True
  • False
Q.25

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 Boyle's law.

  • Yes
  • No
Q.26

It is __________ to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.

  • possible
  • impossible
Q.27

The value of one bar (in S. I. units) is equal to

  • 1 x 102 N/m2
  • 1 x 103 N/m2
  • 1 x 104 N/m2
  • 1 x 105 N/m2
Q.28

The efficiency of Diesel cycle increases with increase in cut-off.

  • Yes
  • No
Q.29

The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is

  • 0.086
  • 1.086
  • 3.086
  • 4.086
Q.30

Briquetted coal is produced from the finely ground coal by moulding under pressure with or without a binding material.

  • True
  • False
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