Q.1
Fire tube boilers are
  • internally fired
  • externally fired
  • internally as well as externally fired
  • none of these
Q.2
An economiser __________ the steam raising capacity of a boiler.
  • increases
  • decreases
  • has no effect on
  • Both A & B
Q.3
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.4
The diameter of flue tube in a Cornish boiler is __________ that of the shell.
  • one-fourth
  • one-third
  • two-fifth
  • three-fifth
Q.5
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.6
The temperature of condensate is __________ on leaving the condenser than that of circulating water at inlet.
  • higher
  • lower
Q.7
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.8
The natural draught is produced by
  • steam jet
  • centrifugal fan
  • chimney
  • both (a) and (b)
Q.9
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.10
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.11
The function of a connecting rod is not to convert reciprocating motion of the piston into rotary motion.
  • True
  • False
Q.12
La-mont boiler, is a high pressure water tube steam boiler working on forced circulation.
  • Agree
  • Disagree
Q.13
Loeffler boiler is a water tube boiler using a forced circulation of water.
  • True
  • False
Q.14
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.15
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.16
A grate, in a boiler, is a place in the combustion chamber upon which fuel (wood or coal) is burnt.
  • True
  • False
Q.17
The reheat factor is the ratio of the
  • Cumulative heat drop to the isentropic heat drop
  • Isentropic heat drop to the heat supplied
  • Total useful heat drop to the total isentropic heat drop
  • None of the above
Q.18
Duplex feed pumps are used in small steam boilers. These operate on the principle of
  • Centrifugal pump
  • Axial flow pump
  • Gear pump
  • Reciprocating pump
Q.19
In a boiler, the heat is lost
  • To dry flue gases
  • In moisture present in the fuel
  • To steam formed by combustion of hydrogen per kg of fuel
  • All of the above
Q.20
The friction present between the steam and the nozzle surfaces reduces the heat drop by
  • 10 to 15%
  • 15 to 25%
  • 25 to 40%
  • 40 to 60%
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