Top 350+ Solved Heat Engines MCQ Questions Answer
Q. A 'blue' flame is
a. Non-radiant flame
b. Radiant flame
c. Super high temperature flame
d. Ordinary flame in oil burners
e. None of the above
Q. The thermal efficiency of a dual cycle engine with fixed compression ratio and fixed quantity of het and with increase in pressure ratio, will
a. Increase
b. Decrease
c. Not change
d. Depends on another factors
e. None of the above
Q. Turbidity in boiler feed water causes
a. Sludge
b. Embrittlement
c. Corrosion
d. Scale
e. None of the above
Q. A mixture containing 60% cetane and 40% Iso-octane will have
a. Cetane number 60
b. Cetane number 40
c. Octane number 60
d. Octane number 40
e. None of the above
Q. A vacuum of 712 mm was obtained with the barometer reading 753 mm of mercury. The corrected vacuum to a standard barometer of 760 would be
a. 719 mm Hg
b. 753 mm Hg
c. 706 mm Hg
d. 760 mm Hg
e. 712 mm Hg
Q. Flash point for diesel fuel oil should be
a. Minimum 49?C
b. Maximum 49?C
c. Maximum 100?C
d. Maximum 200?C
e. None of the above
Q. The knocking tendency in a compression ignition engine for a given fuel will
a. Enhance by reducing compression ratio
b. Enhance by increasing compression ratio
c. Depend on other factors
d. Increase to certain limits and then no change
e. None of the above
Q. A steam turbine in which a part of the steam turbine after partial expansion is used for process heating and the remaining steam is further expanded for power generation, is known as
a. Impulse turbine
b. Regenerative turbine
c. Back pressure turbine
d. Pass out turbine
e. 50% reaction turbine
Q. A De-Laval turbine is
a. Multiple stage reaction turbine
b. Single rotor impulse turbine
c. Multiple rotor reaction turbine
d. Velocity compounded impulse turbine
e. Single rotor reaction turbine
Q. In a cut off covered steam engine
a. Admission pressore remains constant while cut off is varied
b. Admission pressure is reduced while cut off remains unaltered
c. Admission pressure and cut off both are varied
d. Neither admission pressure nor cut off is varied
e. Admission pressure is increased while cut off remains unaltered
Q. Which one of the following is a safety device on a compressor?
a. Intercooler relief valve
b. Over pressure shut down
c. Strainer
d. Over speed shut down
e. Relief valve
Q. Naphtha is used as
a. Lubricant for turbines
b. Lubricant for slow speed engines
c. Fuel for marine engines
d. Fuel for furnaces
e. Fuel for aero engines
Q. An air fuel ratio 8 will have
a. Chemically correct air
b. Excess fuel
c. Excess air
d. Any of above
e. None of above
Q. Consumption of diesel in a diesel engine per BHP per hour is in the range
a. 185-210 gm
b. 215-300 gm
c. 500-800 gm
d. 100-150 gm
e. 150-180 gm