71. The cut-off ratio is the reciprocal of expansion ratio,
Correct
Incorrect
✅ The correct answer is option A.
Steam Boilers and Engines MCQs
72. In a compound steam engine, the temperature range per cylinder is reduced, with corresponding reduction in the condensation.
Correct
Incorrect
✅ The correct answer is option A.
73. Combustuion of fuel takes place __________ the engine cylinder of a steam engine.
outside
inside
✅ The correct answer is option A.
74. The evaporative capacity of a boiler is defined as the evaporation of 15.653 kg of water per hour from and at 100° C.
Yes
No
✅ The correct answer is option B.
75. There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called
wet steam
saturated steam
superheated steam
cushion steam
✅ The correct answer is option D.
76. The performance of a boiler is measured by the
amount of water evaporated per hour
steam produced in kg/h
steam produced in kg/kg of fuel burnt
all of these
✅ The correct answer is option D.
77. 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
✅ The correct answer is option D.
78. In surface condensers, the condensate and the cooling water mixes up.
TRUE
FALSE
✅ The correct answer is option B.
79. The cylinder condensation or missing quantity may be reduced by
the efficient steam jacketing of the cylinder walls
superheating the steam supplied to the engine cylinder
keeping the expansion ratio small in each cylinder
all of the above
✅ The correct answer is option D.
80. The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called
safety valve
water level indicator
pressure gauge
fusible plug
✅ The correct answer is option A.