Q.1
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.2
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.3
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.4
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.5
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.6
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.7
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.8
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.9
The fire tubes in a Cochran boiler are
  • horizontal
  • vertical
  • inclined
  • All of above
Q.10
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.11
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.12
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.13
The fire tubes in a Scotch marine boiler are
  • horizontal
  • vertical
  • inclined
  • None of these
Q.14
The shell diameter of a Locomotive boiler is
  • 1 m
  • 1.5 m
  • 2 m
  • 2.5 m
Q.15
The length of shell of a Locomotive boiler is
  • 1 m
  • 2 m
  • 3 m
  • 4 m
Q.16
An air preheater is installed
  • before the economiser
  • before the superheater
  • between the economiser and chimney
  • none of these
Q.17
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.18
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.19
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.20
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
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