Q.1

The function of a valve rod is

  • to provide reciprocating motion to the slide valve
  • to convert reciprocating motion of the piston into rotary motion of the crank
  • to convert rotary motion of the crankshaft into to and fro motion of the valve rod
  • to provide simple harmonic motion to the D-slide valve
Q.2

Water tube boilers are

  • internally fired
  • externally fired
  • internally as well as externally fired
  • none of these
Q.3

Willian's law holds good for throttle-governed engine, but not for cut-off governed engine.

  • True
  • False
Q.4

The fire tubes in a Cochran boiler are

  • horizontal
  • vertical
  • inclined
Q.5

The object of producing draught in a boiler is

  • to provide an adequate supply of air for the fuel combustion
  • to exhaust the gases of combustion from the combustion chamber
  • to discharge the gases of combustion to the atmosphere through the chimney
  • all of the above
Q.6

The natural draught is produced by

  • steam jet
  • centrifugal fan
  • chimney
  • both (a) and (b)
Q.7

A device used to increase the temperature of saturated steam without raising its pressure, is called

  • blow off cock
  • fusible plug
  • superheater
  • stop valve
Q.8

Which of the following is required for a steam condensing plant ?

  • Condenser
  • Condensate pump
  • Air extraction pump
  • all of these
Q.9

The draught produced by a steam jet issuing from a nozzle placed in the ashpit under the fire grate of the furnace is called

  • induced steam jet draught
  • chimney draught
  • forced steam jet draught
  • none of these
Q.10

A double acting steam engine with a cylinder diameter ofmm and a stroke ofmm has a cut-off of 0.The expansion ratio for this engine is nearly

  • 1.05
  • 2.86
  • 6.65
  • 10.05
Q.11

In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

  • water space also
  • chimney
  • steam space
  • superheater
Q.12

Willian's line for the steam engine is a straight line relationship between the steam consumption per hour and

  • indicated power
  • brake power
  • efficiency
  • pressure of steam
Q.13

The diameter of flue tube in a Cornish boiler is __________ that of the shell.

  • one-fourth
  • one-third
  • two-fifth
  • three-fifth
Q.14

The missing quantity is mainly due to cylinder condensation and a small amount of steam leakage past the valves and piston.

  • Agree
  • Disagree
Q.15

Which of the following statement is wrong ?

  • The factor of evaporation for all boilers is always greater than unity.
  • The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100° C.
  • The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency.
  • none of the above
Q.16

The aim of a compound steam engine is

  • to reduce the ratio of expansion in each cylinder
  • to reduce the length of stroke
  • to reduce the temperature range in each cylinder
  • all of the above
Q.17

In water tube boilers

  • water passes through the tubes which are surrounded by flames and hot gases
  • the flames and hot gases pass through the tubes which are surrounded by water
  • forced circulation takes place
  • none of these
Q.18

The temperature of condensate is __________ on leaving the condenser than that of circulating water at inlet.

  • higher
  • lower
Q.19

An economiser __________ the steam raising capacity of a boiler.

  • increases
  • decreases
  • has no effect on
Q.20

There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

  • wet steam
  • saturated steam
  • superheated steam
  • cushion steam
Q.21

The function of a crosshead is to guide motion of the __________ and to prevent it from bending.

  • piston rod
  • connecting rod
  • eccentric rod
  • valve rod
Q.22

The average operating pressure of Benson boiler is

  • 100 bar
  • 150 bar
  • 200 bar
  • 250 bar
Q.23

Which of the following statement is wrong ?

  • Locomotive boiler is a water tube boiler.
  • Water tube boilers are internally fired.
  • La-mont boiler is a low pressure water tube boiler.
  • all of the above
Q.24

A draught produced by a chimney due to the difference of densities between the hot gases inside the chimney and cold atmospheric air outside it, is called natural draught.

  • Yes
  • No
Q.25

Fire tube boilers are

  • internally fired
  • externally fired
  • internally as well as externally fired
  • none of these
Q.26

The ratio of the volume at cut-off to the swept volume is called

  • cut-off ratio
  • expansion ratio
  • clearance ratio
  • none of these
Q.27

The cylinder dimensions of a compound engine may be designed on the basis of

  • equal power developed in each cylinder for uniform turning moment
  • equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
  • equal temperature drop in each cylinder for economy of steam
  • all of the above
Q.28

The diameter of Cornish boiler varies from

  • 0.5 to 1 m
  • 1 to 2 m
  • 1.25 to 2.5 m
  • 2 to 3 m
Q.29

A grate, in a boiler, is a place in the combustion chamber upon which fuel (wood or coal) is burnt.

  • True
  • False
Q.30

Which of the following statement is correct ?

  • A fire tube boiler occupies less space than a water tube boiler, for a given power.
  • Steam at a high pressure and in large quantities can be produced with a simple vertical boiler.
  • A simple vertical boiler has one fire tube.
  • all of the above
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