Q.1

A safety valve usually employed with stationary boilers is

  • lever safety valve
  • dead weight safety valve
  • high steam and low water safety valve
  • all of these
Q.2

The function of a piston rod is

  • to guide motion of the piston rod and to prevent it from bending
  • to transfer motion from the piston to the cross head
  • to convert heat energy of the steam into mechanical work
  • to exhust steam from the cylinder at proper moment
Q.3

A single acting steam engine produces __________ power than that of double acting steam engine.

  • equal
  • half
  • double
  • four times
Q.4

Cut-off governing of steam engines is a method of controlling the engine output by varying

  • volume of intake steam
  • pressure of intake steam
  • temperature of intake steam
  • all of these
Q.5

Which of the following boiler is best suited to meet the fluctuating demand of steam ?

  • Locomotive boiler
  • Lancashire boiler
  • Cornish boiler
  • Babcock and Wilcox boiler
Q.6

The fire tubes in a Scotch marine boiler are

  • horizontal
  • vertical
  • inclined
Q.7

Loeffler boiler is a water tube boiler using a forced circulation of water.

  • True
  • False
Q.8

The pressure of steam in the engine cylinder at the beginning of the stroke is __________ the boiler pressure.

  • equal to
  • less than
  • higher than
Q.9

In a boiler, feed water supplied per hour iskg while coal fired per hour iskg. The net enthalpy rise per kg of water iskJ. If the calorific valve of the coal iskJ/kg, then the boiler efficiency will be

  • 56%
  • 63%
  • 74%
  • 78%
Q.10

An air preheater is installed

  • before the economiser
  • before the superheater
  • between the economiser and chimney
  • none of these
Q.11

In a reciprocating steam engine, the heat energy in the steam is converted into mechanical work by the to and fro motion of the piston.

  • Agree
  • Disagree
Q.12

La-mont boiler, is a high pressure water tube steam boiler working on forced circulation.

  • Agree
  • Disagree
Q.13

The function of a flywheel is

  • to convert reciprocating motion of the piston into rotary motion.
  • to convert rotary motion of the crankshaft into to and fro motion of the valve rod
  • to prevent fluctuation of speed
  • to keep the engine speed uniform at all load conditions
Q.14

A safety valve mainly used with locomotive and marine boilers is

  • lever safety valve
  • dead weight safety valve
  • high steam and low water safety valve
  • spring loaded safety valve
Q.15

The length of shell of a Locomotive boiler is

  • 1 m
  • 2 m
  • 3 m
  • 4 m
Q.16

The effect of wire drawing is to decrease the area of indicator diagram and thus work done by the engine is reduced.

  • Agree
  • Disagree
Q.17

The power of a boiler may be defined as

  • the ratio of heat actually used in producing the steam to the heat liberated in the furnace
  • the amount of water evaporated or steam produced in kg per kg of fuel burnt
  • the amount of water evaporated from and at 100° C into dry and saturated steam
  • the evaporation of 15.653 kg of water per hour from and at 100° C
Q.18

The function of a connecting rod is not to convert reciprocating motion of the piston into rotary motion.

  • True
  • False
Q.19

The rate of steam produced in Benson boiler is

  • 100 tonnes/h
  • 135 tonnes/h
  • 175 tonnes/h
  • 250 tonnes/h
Q.20

In a uniflow engine

  • steam enters and exhausts through the same port
  • steam enters at one end and exhausts at the centre
  • steam enters at the centre and exhausts at the other end
  • none of the above
Q.21

When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

  • internally fired boiler
  • externally fired boiler
  • natural circulation boiler
  • forced circulation boiler
Q.22

Which of the following statement is correct for a compound steam engine ?

  • The cost of the engine, for the same power and economy, is more than that of a simple steam engine.
  • The forces in the working parts are increased as the forces are distributed over more parts.
  • The ratio of expansion is reduced, thus reducing the length of stroke.
  • The temperature range per cylinder is increased, with corresponding increase in condensation.
Q.23

In natural circulation steam boilers, the circulation of water is by convection currents which are set up during the heating of water.

  • Correct
  • Incorrect
Q.24

Which of the following statement is correct ?

  • Lancashire boiler is a fire tube boiler.
  • Fire tube boilers are internally fired.
  • Babcock and Wilcox boiler is a water tube boiler.
  • all of the above
Q.25

The shell diameter of a Locomotive boiler is

  • 1 m
  • 1.5 m
  • 2 m
  • 2.5 m
Q.26

The function of a safety valve is

  • to blow off steam when the pressure of steam inside the boiler exceeds the working pressure
  • to indicate the water level inside the boiler to an observer
  • to measure pressure of steam inside the steam boiler
  • none of the above
Q.27

When the speed of the crankshaft is betweenr.p.m. andr.p.m., the engine said to be a

  • slow speed engine
  • medium speed steam engine
  • high speed steam engine
  • none of these
Q.28

The cut-off ratio is the reciprocal of expansion ratio,

  • Correct
  • Incorrect
Q.29

The selection of type and size of a steam boiler depends upon

  • the power required and working pressure
  • the geographical position of the power house
  • the fuel and water available
  • all of the above
Q.30

In a receiver type compound engine, the high pressure and low pressure cylinders

  • have common piston rod
  • are set at 90°
  • have separate piston rods
  • are set in V - arrangement
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