71. The overall efficiency is defined as the ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time.
TRUE
FALSE
✅ The correct answer is option A.
IC Engines and Nuclear Power Plants MCQs
72. Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine ?
inlet valve closing after bottom dead centre
inlet valve closing before bottom dead centre
inlet valve opening before top dead centre
exhaust valve closing
✅ The correct answer is option B.
73. A nuclear power plant differs from a conventional steam power station only in the steam generating part.
Agree
Disagree
✅ The correct answer is option A.
74. The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of
Morse test
prony brake test
motoring test
heat balance test
✅ The correct answer is option A.
75. In a four stroke cycle diesel engine, the exhaust valve
opens at 30° before bottom dead cnetre and closes at 10° after top dead centre
opens at 30° after bottom dead centre and closes at 10° before top dead centre
opens at bottom dead centre and closes at top dead centre
may open and close any
✅ The correct answer is option A.
76. The function of a distributor in a coil ignition system of I.C. engines is
to distribute spark
to distribute power
to distribute current
to time the spark
✅ The correct answer is option D.
77. An atom bomb utilises uncontrolled nuclear fission.
TRUE
FALSE
✅ The correct answer is option A.
78. Reflector in nuclear power plants __________ neutron leakage.
increases
decreases
have no effect on
✅ The correct answer is option B.
79. The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in metres, N = Speed of engine in r.p.m., S – Spring balance reading in newtons, D = Dia. of brake drum in metres, and d = Dia. of rope in metres)
all of these
✅ The correct answer is option D.
80. The working pressure and temperature inside the cylinder of an internal combustion engine is __________ as compared to a steam engine.
low
very low
high
very high
✅ The correct answer is option D.