Q.1

The internal flue tubes of a Lancashire boiler are reduced in diameter at the back to provide access to the lower part of the boiler.

  • True
  • False
Q.2

Benson boiler is a __________ water tube steam boiler using forced circulation of water.

  • low pressure
  • high pressure
Q.3

The number of fire tubes in a Cochran boiler are

  • 75
  • 115
  • 165
  • 225
Q.4

The main object of a boiler trial is

  • to determine the generating capacity of the boiler
  • to determine the thermal efficiency of the boiler when working at a definite pressure
  • to prepare heat balance sheet for the boiler
  • all of the above
Q.5

Which of the following is not a boiler mounting?

  • Blow off cock
  • Feed check valve
  • Economiser
  • Fusible plug
Q.6

The shell of the Cochran boiler is made hemispherical

  • to give maximum space and strength
  • to withstand the pressure of steam inside the boiler
  • both (a) and (b)
  • none of the above
Q.7

The amount of water evaporated or steam produced in kg per kg of fuel burnt is termed as evaporative capacity of a boiler.

  • Agree
  • Disagree
Q.8

A single ended Scotch marine steam boiler may have one to four furnaces which enter from front end of the boiler.

  • Correct
  • Incorrect
Q.9

The diameter of a cylindrical shell of a Scotch marine boiler varies from

  • 1.5 to 2 m
  • 2.5 to 3.5 m
  • 3.5 to 4.5 m
  • none of these
Q.10

The function of an eccentric is to provide __________ motion to the slide valve.

  • reciprocating
  • rotary
Q.11

The evaporative capacity of a boiler is defined as the evaporation of 15.kg of water per hour from and atC.

  • Yes
  • No
Q.12

The ratio of the __________ to the volume at cut-off is called expansion ratio.

  • swept volume
  • clearance volume
Q.13

The fire tubes in a Cochran boiler usually have __________ diameter.

  • 6.25 mm
  • 62.5 mm
  • 72.5 mm
  • 92.5 mm
Q.14

A good steam boiler is one which produces maximum quantity of steam with the given fuel

  • Agree
  • Disagree
Q.15

A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is knwon as

  • superheater
  • air preheater
  • economiser
  • injector
Q.16

Lancashire boiler has __________ internal flue tubes.

  • one
  • two
  • three
  • four
Q.17

The actual power supplied by the engine crankshaft is called

  • indicated power
  • brake power
  • frictional power
  • none of these
Q.18

The artificial draught is produced by

  • steam jet
  • centrifugal fan
  • chimney
  • both (a) and (b)
Q.19

A __________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

  • blow off cock
  • fusible plug
  • stop valve
  • safety valve
Q.20

In a compound steam engine, the temperature range per cylinder is reduced, with corresponding reduction in the condensation.

  • Correct
  • Incorrect
Q.21

The high steam and low water safety valve is used to blow off steam when the

  • steam pressure exceeds the working pressure
  • water level in the boiler becomes too low
  • both (a) and (b)
  • none of the above
Q.22

The missing quantity per stroke is equal to

  • cylinder feed - indicated mass of steam
  • cylinder feed + indicated mass of steam
  • mass of cushion steam + indicated mass of steam
  • mass of cushion steam + cylinder feed
Q.23

The amount of water evaporated in kg per kg of fuel burnt is called

  • evaporative capacity of a boiler
  • equivalent evaporation from and at 100° C
  • boiler efficiency
  • none of these
Q.24

The factor of evaporation for all boilers is always

  • equal to unity
  • less than unity
  • greater than unity
Q.25

Fire tube boilers are limited to a maximum working pressure of

  • 0.17 MN/m2
  • 1.7 MN/m2
  • 17 MN/m2
  • 170 MN/m2
Q.26

The water tubes in a Babcock and Wilcox boiler are

  • vertical
  • horizontal
  • inclined
Q.27

The draught may be produced by a

  • mechanical fan
  • chimney
  • a steam jet
  • all of these
Q.28

In a La-mont boiler, there is a __________ circulation of water and steam.

  • forced
  • natural
Q.29

The maximum heat loss is a boiler occurs due to

  • moisture in fuel
  • dry flue gases
  • steam formation
  • unburnt carbon
Q.30

In water tube boilers, the water passes through the tubes which are surrounded by flames and hot gases.

  • Yes
  • No
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