Q.1

An air preheater

  • increases evaporative capacity of the boiler
  • increases the efficiency of the boiler
  • enables low grade fuel to be burnt
  • all of the above
Q.2

The diameter of superheated tubes in a locomotive boiler is

  • 13 mm
  • 31 mm
  • 130 mm
  • 230 mm
Q.3

An air preheater

  • increases evaporative capacity of the boiler
  • increases the efficiency of the boiler
  • enables low grade fuel to be burnt
  • all of the above
Q.4

The fire tubes in a Locomotive boiler has __________ diameter.

  • 4.75 mm
  • 5.47 mm
  • 7.45 mm
  • 47.5 mm
Q.5

Which of the following is a fire tube boiler ?

  • Lansashire boiler
  • Babcock and Wilcox boiler
  • Yarrow boiler
  • none of these
Q.6

A Tandem type compound engine requires a larger flywheel.

  • True
  • False
Q.7

In forced circulation steam boilers, the force is applied

  • to draw water
  • to circulate water
  • to drain off the water
  • all of these
Q.8

Besides mean effective pressure, the data required to determine the indicated power of an engine include

  • piston diameter, length of stroke and calorific value of fuel
  • piston diameter, specific fuel consumption and Calorific value of fuel
  • piston diameter, length of stroke and speed of rotation
  • specific fuel consumption, speed of rotation and torque
Q.9

The water tube boilers produce steam at a __________ pressure than that of fire tube boilers.

  • higher
  • lower
Q.10

The actual vacuum in a condenser is equal to

  • barometric pressure + actual pressure
  • barometric pressure - actual pressure
  • gauge pressure + atmospheric pressure
  • gauge pressure - atmospheric pressure
Q.11

Throttle 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.12

A condenser in a steam power plant

  • increases expansion ratio of steam
  • reduces back pressure of steam
  • reduces temperature of exhaust steam
  • all of these
Q.13

The amount of water evaporated from feed water at __________ into dry and saturated steam atC at normal atmospheric pressure is called equivalent evaporation from and atC.

  • 0°C
  • 40°C
  • 60°C
  • 100°C
Q.14

A throttle governed steam engine developskW withkg per hour of steam andkW withkg per hour of steam. The steam consumption in kg per hour when developingkW will be nearly

  • 150 kg/h
  • 210 kg/h
  • 280 kg/h
  • 340 kg/h
Q.15

Which of the following statement is wrong?

  • The mechanical draught reduces the height of chimney.
  • The natural draught reduces the fuel consumption.
  • A balanced draught is a combination of induced and forced draught.
  • all of the above
Q.16

An economiser is installed in a boiler primarily to

  • superheat the steam
  • reduce fuel consumption
  • increase steam pressure
  • all of these
Q.17

The function of a governor is to keep the engine speed uniform at all load conditions.

  • Correct
  • Incorrect
Q.18

The efficiency of the plant __________ with the mechanical draught.

  • increases
  • decreases
  • remains constant
Q.19

The mechanical draught __________ with the amount of smoke.

  • increases
  • decreases
  • does not effect
Q.20

The function of a superheater is to heat the feed water by utilising the heat in the exhaust flue gases before leaving through the chimney.

  • Yes
  • No
Q.21

Willian's line follows the law (where b = A constant representing the shape of the Willian's line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

  • I.P. = a x m + b
  • m = a + b x I.P.
  • I.P. = b x m + a
  • m = b/I.P. - a
Q.22

In a double acting steam engine, the steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft.

  • Yes
  • No
Q.23

Which of the following are boiler accessories ?

  • economiser
  • superheater
  • both (a) and (b)
  • none of these
Q.24

When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

  • internally fired boiler
  • externally fired boiler
  • natural circulation boiler
  • forced circulation boiler
Q.25

The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

  • feedpump
  • injector
  • feed check valve
  • pressure gauge
Q.26

The theoretical indicator diagram of a simple steam engine is based upon the assumption that

  • there is no pressure drop due to condensation
  • steam is admitted at boiler pressure and exhausted at condenser pressure
  • the expansion (or compression) of the steam is hyperbolic
  • all of the above
Q.27

The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks

  • 180° to each other
  • 90° to each other
  • 0° to each other
  • none of these
Q.28

When the expansion of steam is carried out in a single cylinder and then exhausted into the atmosphere or a condenser, the engine is said to be a simple steam engine.

  • Correct
  • Incorrect
Q.29

Cornish boilers are multi-tubular boilers.

  • True
  • False
Q.30

All steam engines work on

  • Zeroth law of thermodynamics
  • First law of thermodynamics
  • Second law of thermodynamics
  • none of these
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