Top 350+ Solved Heat Engines MCQ Questions Answer
Q. Which of the following can have octane rating of more than 100?
a. Gobar gas
b. Normal petrol
c. Methyl alcohol
d. Benzol
e. Ethyl alcohol
Q. Normally the colour of exhaust from a diesel engine is
a. Bluish
b. Reddish
c. Violet
d. Black
e. Yellowish
Q. For initially dry and saturated steam flowing through a nozzle the volue of critical pressure ratio is given by
a. 0.577
b. 1
c. 0.528
d. 0.546
e. 0.75
Q. Which of the following type of internal combustion engines uses rocker arms?
a. Radial engines
b. Side valve engines
c. Overhead valve engines
d. Stationary engines
e. All of the above
Q. In naturally aspirated engine the pressure inside cylinder at the end of suction stroke is
a. Less than atmospheric
b. Same as atmospheric
c. More than atmospheric
d. Depends on atmospheric conditions
e. None of the above
Q. A hot short metal is
a. Brittle when heated
b. Brittle when cold
c. Ductile at low temperatures
d. Ductile at high temperatures
e. None of the above
Q. In a SI engine the advancing of spark timing will
a. Increase knocking tendency
b. Reduce knocking tendency
c. Not have any effect
d. Depends on intensity of spark only
e. None of the above
Q. Of the calorific value ranges given below which one is generally for coal?
a. 2500 - 4000 kcal/kg
b. 1000 - 2500 kcal/kg
c. 4000 - 7000 kcal/kg
d. 8000 - 12000 kcal/kg
e. 100 - 1000 kcal/kg
Q. The function of a piston rins in an internal combustion engine is
a. To prevent lubricating oil from entering the combustion space
b. To prevent leakage of combustion chamber products
c. To transfer heat from piston to cylinder walls
d. All of the above
e. None of the above
Q. Zeroth law of thermodynamics states that
a. Two systems are always in equilibrium
b. If two systems are in equilibrium the third system will also be in equilibrium
c. If two systems are in thermal equilibrium with a third system, then they are in equilibrium with each other
d. Two systems not in equilibrium with a third system are also not in equilibrium with each other
e. None of the above
Q. For the same peak pressure and heat input
a. Otto cycle is more efficient
b. Diesel cycle is more efficient
c. Both are equally efficient
d. None of the above
Q. In a jet propulsion unit the products of combustion after passing through the gas turbine are discharged into
a. Recycled back to compressor
b. Atmosphere
c. Compressor
d. Vacuum
e. Discharge nozzle
Q. A D-slide valve is used in
a. Two stroke engines
b. Diesel engines
c. Petrol engines
d. Steam engines
e. Double acting engines
Q. The Clapeyron equation is applicable for
a. System in equilibrium
b. Change of state
c. Change of state when two phases are in equilibrium
d. Change of state when water and water vapours are involved
e. None of the above