Top 350+ Solved Heat Engines MCQ Questions Answer
Q. Centrifugal blowers can supply
a. Large volumes of air at low pressures
b. Large volumes of air at high pressures
c. Small volumes of air at high pressures
d. Small volumes of air at low pressures
e. None of the above
Q. To augment the thrust of jet propulsion units part of the fuel is burned in the exhaust. How does this fuel burn
a. Some chemicals rich in oxygen are mixed with fuel
b. Oxygen is also supplied along with fuel
c. 600;1
d. Fuel is never burned in exhaust pipe
e. Fuel finds oxygen from excess air supplied to engine
Q. Intake air filters are provided on air compressor for
a. Removing dirt and dust from suction air
b. Reducing temperature of suction air
c. Reducing pressure of suction pressure
d. Removing impurities of air
e. None of the above
Q. Which one of the following factors will not assist in getting high power output from a compression ignition engine
a. High compression ratio
b. Fine atomisation of fuel
c. High charge density
d. Large quantity of excess air
e. None of the above
Q. The lowest temperature upto which a mercury thermometer can be used is
a. ? 39?C
b. ? 260?C
c. ? 173?C
d. ? 10?C
e. 0?C
Q. In case of a condensing turbine the pressure in the last stage of the turbine is
a. Same as atmospheric pressure
b. Slightly above the atmospheric pressure
c. 5 to 6 kg/cm2 above the atmospheric pressure
d. Less than the atmospheric pressure
e. 10 to 12 kg/cm2 above the atmospheric pressure
Q. The blades of a turbine are made of
a. High speed steel
b. Cast iron
c. Alloy steel
d. Nickel alloy
e. Stainless steel
Q. The frictional horse power of a well adjusted petrol engine should be nearly
a. 50%
b. 40%
c. 25%
d. Carbon dioxide
e. 10%
Q. LPG stands for
a. Liquefied petroleum gas
b. Low pressure gas
c. Light pressure gas
d. Lubricated petroleum gas
e. None of the above
Q. The term scavanging is generally associated with
a. High speed engines
b. Air cooled engines
c. Multi-cylinder engines
d. Two stroke engines
e. Vertical engines
Q. Solubility of a gas in a liquid at small concentration is represented in
a. Henry's law
b. Clausius Clapeyron equation
c. Raoult's law
d. Dalton's law
e. None of the above
Q. The engine provided on scooters is generally
a. Four stroke, air cooled
b. Four cylinder, air cooled
c. Two stroke, double acting
d. Two stroke, air cooled
e. Four stroke, water cooled
Q. The instrument used for the measurement of area of p-v diagram is known as
a. Digitometer
b. Clinometer
c. Planimeter
d. Areameter
e. Graphometer
Q. If in a compression ignition engine the noise level is to be reduced, the design features which will not be affected are
a. Combustion system
b. Exhaust muffling
c. Intake muffling
d. Fuel injection equipment
e. None of the above
Q. For dry saturated steam the value of adiabatic index n is taken as
a. 1.135
b. 1.41
c. 1.35
d. 25 to 30
e. 1.68