Top 350+ Solved Heat Engines MCQ Questions Answer
Q. In a Bomb calorimeter the fuel to be tested is burnt
a. At constant volume
b. At constant pressure
c. There is no consideration of volume or pressure
d. In open atmosphere
e. At constant temperature
Q. Which fuel will have least air consumption during combustion
a. Spirit
b. Benzol
c. Diesel fuel oil
d. Gasoline
e. Lubricating oil
Q. Movement of air inside engine cylinder does not help in
a. Distribution of fuel
b. Mixing of fuel with air
c. Reduction of after burning
d. Reducing noise
e. None of the above
Q. In a Lancashire boiler, the economiser is located
a. Before air preheater
b. After air preheater
c. Between feed pump and boiler
d. At any of the above locations
e. None of the above locations
Q. 1 Torr is equivalent to
a. 1 mm Hg
b. 13.6 cm of water column
c. 760 mm of water
d. 760 mm of Hg
e. None of the above
Q. The most effective air cleaner for diesel engines is
a. Whirl type
b. Oil bath type
c. Dry type
d. Rope type
e. Wet type
Q. An economiser is installed in a boiler plant primarily to
a. Increase steam pressure
b. Increase rate of steam evaporation
c. Superheat the steam
d. Purify boiler feed water
e. Reduce fuel consumption
Q. The equilibrium conditions between supersaurated vapour and a cooled liquid surface are expressed in
a. Dalton's equation
b. Napier's equation
c. Kelvin Helmhotz equation
d. Clapcyron's equation
e. Calender's equation
Q. Most of the heat generated in I.C. engines is transferred to surrounding medium by
a. Conduction only
b. Convection only
c. Conduction and convection
d. Radiation only
e. None of the above
Q. Vapour lock is
a. Supply of liquid fuel particles to engine in maixture
b. Excess fuel supply to engine due to faster evaporation
c. Complete or partial stoppage of fuel supply due to vaporisation of fuel in supply steam
d. Lock of vaporization of fuel to atomspheric pressure
e. Locking carburettor jets due to vapour pressure
Q. The steam pressure in a pass out turbine may be expected to be in the range
a. 10 kg/cm2 to 20 kg/cm2
b. 100 kg/cm2 to 150 kg/cm2
c. 150 kg/cm2 to 300 kg/cm2
d. 75 kg/cm2 to 100 kg/cm2
e. 40 kg/cm2 to 75 kg/cm2
Q. A regenerator in a gas turbine
a. Reduces heat loss in exhaust
b. permits use of higher compression ratio
c. Improves thermal efficiency
d. Permits use of fuels of inferior quality
e. None of the above
Q. Higher proportion of residual gases in the cylinder would mean
a. Higher volumetric efficiency
b. Lower volumetric efficiency
c. No change in volumetric efficiency
d. Depends on other factors
e. None of the above