Top 350+ Solved Heat Engines MCQ Questions Answer
Q. Corona is generally accompanied by a faint glow and
a. Spark
b. Sparking
c. Heating of conductors
d. Explosion
e. Hissing noise
Q. If after some use the lower part, electrodes and beathing space of a spark plug are found coated by deposits of soot and carbon, the conclusion will be
a. Spark plug is of proper heat rating
b. Spark advance is incorrect
c. Spark plug is short circuited
d. Composition of mixture in the engine is correct
e. Spark plug is of too high heat rating
Q. As the compression ratio increases the volumetric efficiency of air compressor
a. Increases
b. Decreases
c. Does not change
d. Unpredictable
e. None of the above
Q. A fan is being used under certain conditions. If the fan speed is doubled the power requirement will be
a. 8 times
b. 16 times
c. Unchanged
d. Double of the original
e. Four times
Q. A jet engine has
a. Propeller on top
b. No propeller
c. Propeller in back
d. Two propellers
e. Propeller in front
Q. In jet engines the compression ratio
a. Varies with altitude
b. Varies with square of speed
c. Varies as cube of speed
d. Remains constant
e. None of the above
Q. Steam trap is a device that
a. Allows passage of water but prevents the passage of steam
b. Allows passage of air but prevents passage of steam
c. Allows passage of the flue gases but prevents flow of steam
d. None of the above
e. Chain grate stokers
Q. A petrol engine as compared to diesel engine (both running at full load) is
a. More efficient
b. Less efficient
c. Equally efficient
d. Depend on other factors
e. None of the above
Q. Which one of the following assumptions is not involved while deriving relation for air standard efficiency of Otto cycle?
a. The engine operates at mederate rpm
b. There is always thermal and chemical equilibrium
c. Expansion and compression are adiabatic
d. There is no chemical reaction inside the engine clinder
e. The working fluid is air for which the specific heats are constant
Q. Which of the following needs constant cleaning in a diesel engine?
a. Air only
b. Fuel only
c. Air, fuel and lubricating oil
d. Lubricating oil only
e. Air and fuel only
Q. Bagasse is
a. Fibrous portion of sugarcane left after extracting the juice
b. A variety of coal
c. A fuel consisting of wood etc
d. Same as biogas
e. A kind of rice straw
Q. During regenerative feed heating
a. Part of the steam is generated in turbine
b. Condenser is supplied with dry and staturated steam
c. Part of the steam is bled from turbine for feed water heating
d. High pressure steam is used to heat low pressure steam coming out of the turbine after expansion
e. None of the above
Q. A jet engine has
a. Propeller in front
b. Propeller in back
c. No propeller
d. Propeller on the top
e. None of the above
Q. Anti-knock for compression ignition engines is
a. Amyl nitrate
b. Aromatics
c. Hexadecane
d. Tetra ethyl lead
e. Trimethyl pentane
Q. Which statement is incorrect?
a. LH.P of engines can be determined by more test
b. Morse test can be conducted only on multicylinder engines
c. Morse test can be conducted on petrol engines
d. Morse test can be conducted on CFR engine.
e. Morse test can also be conducted on diesel engines