Q.1

When a fluid is allowed to expand suddenly into a vaccum chamber through an orifice of large dimensions, the process is known as free expansion process.

  • True
  • False
Q.2

One m3 of methane (CH4) requires 2m3 of oxygen and produces 1m3 of carbon dioxide and 2m3 of water or steam.

  • Correct
  • Incorrect
Q.3

The gas turbine cycle with regenerator improves

  • thermal efficiency
  • work ratio
  • avoids pollution
  • none of these
Q.4

The lower calorific value of fuel may be obtained by adding the heat of steam formed during combustion to the higher calorific value.

  • Yes
  • No
Q.5

Mond gas is obtained by

  • partial combusion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
  • carbonisation of bituminous coal
  • passing steam over incandescent coke
  • passing air and a large amount of steam over waste coal at about 650°C
Q.6

The entropy is a point function and thus it is a property of the same.

  • Correct
  • Incorrect
Q.7

The hard coke is obtained when carbonisation of coal is carried out at

  • 300° to 500°C
  • 500° to700°C
  • 700° to 900°C
  • 900° to 1100°C
Q.8

According to First law of thermodynamics,

  • total internal energy of a system during a process remains constant
  • total energy of a system remains constant
  • workdone by a system is equal to the heat transferred by the system
  • internal energy, enthalpy and entropy during a process remains constant
Q.9

Otto cycle consists of

  • two constant volume and two isentropic processes
  • two constant pressure and two isentropic processes
  • two constant volume and two isothermal processes
  • one constant pressure, one constant volume and two isentropic processes
Q.10

The work ratio of simple gas turbine cycle depends upon

  • maximum cycle temperature
  • minimum cycle temperature
  • pressure ratio
  • all of these
Q.11

The efficiency of Otto cycle depends upon the specific heats of the working substance.

  • Yes
  • No
Q.12

The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)

  • δQ = T.ds
  • δQ = T/ds
  • dQ = ds/T
  • none of these
Q.13

Carnot cycle consists of

  • two constant volume and two isentropic processes
  • two isothermal and two isentropic processes
  • two constant pressure and two isentropic processes
  • one constant volume, one constant pressure and two isentropic processes
Q.14

The numerical value of the thermal capacity and the water equivalent of the substance are the same.

  • Agree
  • Disagree
Q.15

A cycle consisting of __________ and two isothermal processes is known as Stirling cycle.

  • two constant pressure
  • two constant volume
  • two isentropic
  • one constant pressure, one constant volume
Q.16

The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is always __________ one.

  • equal to
  • less than
  • greater than
Q.17

The efficiency of Ericsson cycle is __________ Carnot cycle.

  • greater than
  • less than
  • equal to
Q.18

Coke oven gas is obtained by burning coke in an oven.

  • Agree
  • Disagree
Q.19

Which of the following has the highest calorific value?

  • Peat
  • Lignite
  • Bituminous coal
  • Anthracite coal
Q.20

One kg of carbon monoxide requires 4/7 kg of oxygen and produces

  • 11/3 kg of carbon dioxide gas
  • 7/3 kg of carbon monoxide gas
  • 11/7 kg of carbon dioxide gas
  • 8/3 kg of carbon monoxide gas
Q.21

An open 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
  • mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system
  • both the heat and work as well as mass of the working substance crosses the boundary of the system
  • neither the heat and work nor the mass of the working substance crosses the boundary of the system
Q.22

The natural solid fuel is

  • wood
  • coke
  • anthracite coal
  • pulverised coal
Q.23

The principal constituents of a fuel are

  • carbon and hydrogen
  • oxygen and hydrogen
  • sulphur and oxygen
  • sulphur and hydrogen
Q.24

Which of the following is the correct statement?

  • For a given compression ratio, both Otto and Diesel cycles have the same efficiency.
  • For a given compression ratio, Otto cycle is more efficient than Diesel cycle.
  • For a given compression ratio, Diesel cycle is more efficient than Otto cycle.
  • The efficiency of Otto or Diessel cycle has nothing to do with compressioin ratio.
Q.25

The state of a substance whose evaporation from its liquid state is complete, is known as

  • vapour
  • perfect gas
  • air
  • steam
Q.26

The amount of heat generated per kg of fuel is known as

  • calorific value
  • heat energy
  • lower calorific value
  • higher calorific value
Q.27

The increase in entropy of a system represents

  • increase in availability of energy
  • increase in temperature
  • decrease in pressure
  • degradation of energy
Q.28

The gas constant (R) is equal to the

  • sum of two specific heats
  • difference of two specific heats
  • product of two specific heats
  • ratio of two specific heats
Q.29

The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as

  • element
  • compound
  • atom
  • molecule
Q.30

When a gas is heated at constant volume

  • its temperature will increase
  • its pressure will increase
  • both temperature and pressure will increase
  • neither temperature nor pressure will increase
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