Top 350+ Solved Heat Engines MCQ Questions Answer
Q. Change in internal energy is least during
a. 25 to 30
b. Constant pressure process
c. Constant volume process
d. Adiabatic process
e. Isothermal process
Q. Which of the following is not a petroleum product?
a. Methylated spirit
b. Lubricating oil
c. Kerosene
d. Carbon dioxide
e. Petrol
Q. Thermal efficiency of a standard Otto cycle for a compression ratio 5.5, will be
a. 100%
b. 47.50%
c. 20%
d. 35.40%
e. 50%
Q. The calorific value of methane can be determined by
a. Bomb calorimeter
b. Bunsen's calorimeter
c. Orsat's apparatus
d. Exhaust gas calorimeter
e. None of the above
Q. The fact that the product of pressure and volume of a fixed amount of gas is approximately a constant value is known as
a. Charle's law
b. Gay Lusac's law
c. Dalton's law
d. Lewis law
e. None of the above
Q. A steam nozzle is said to be choked when
a. Pressure at throat is equal to steam supply pressure
b. Throat gets clogged
c. Flow is at maximum value of critical exit pressure
d. Steam flow through nozzle ceases
e. Pressure at throat is less than the exit pressure
Q. In a four stroke cycle the minimum temperature inside the engine cylinder occurs
a. At the end of exhaust stroke
b. At the end of suction stroke
c. At the end of compression stroke
d. At the beginning of exhaust stroke
e. At the beginning of suction stroke
Q. According to Charle's law
a. At constant pressure the volume of a gas is proportional to its absolute temperature
b. At constant temperature, pressure is proportional to temperature
c. At constant temperature, pressure of a gas is proportional to its volume
d. At constant volume the absolute pressure is proportional to the temperature
e. None of the above
Q. Prony brakes are used for testing
a. Slow speed engines
b. High speed engines
c. Engines with small flywheel
d. Small engines
e. Large capacity engines
Q. In wet dry lubrication of diesel engines
a. Oil is splashed
b. Oil is splashed and pumped to various points
c. Oil is pumped to various points
d. All of the above
e. None of the above
Q. In a velocity compounded impulse turbine, while steam flows through the second row of moving blades
a. The velocity increases
b. The velocity reduces
c. Both velocity as well as pressure increase
d. The velocity remains constant
e. The pressure remains constant
Q. Ignition accelerators are often used for
a. Diesel engine fuels
b. Petrol engine fuels
c. Gas turbine fuels
d. Gas generators
e. All of the above
Q. Which one of the following statements is incorrect
a. Combustion is the processes of heat liberation
b. Combustion is a chemical reaction
c. Combustion is rapid oxidation
d. All of the above
e. None of the above
Q. During idling in a compression ignition engine the air fuel ratio may be of the order of
a. 5
b. 20
c. 10
d. 15
e. 30