Top 350+ Solved Heat Engines MCQ Questions Answer
Q. If petrol is supplied to a diesel engine
a. The engine will run at high speeds
b. The engine will run with excessive vibrations
c. The engine will explode
d. The engine will run with high knocking
e. The engine will not run
Q. Which of the following has the lowest pressure in a petrol engine?
a. Gases during power stroke
b. Mixture at the end of compression stroke
c. Mixture at the beginning of suction stroke
d. Mixture at the end of suction stroke
e. Gases during exhaust stroke
Q. The discharge of hydrocarbons from an automobile exhaust is minimum when the vehicle is
a. Decelerating
b. Cruising at high speeds
c. Cruising at low speeds
d. Accelerating
e. Idling
Q. Load curve is the plot of
a. Load versus generatng capacity
b. Load versus current
c. Load versus time
d. Load versus cost of power
e. None of the above
Q. With reference to a safety valve the blow down pressure is the pressure at which
a. Valve opens
b. Valve closes after opening
c. Valve opens initially
d. Valve spring pressure is adjusted
e. None of the above
Q. A four wheel drive automobile has
a. Four stroke engine
b. Air cooled engine
c. Four flywheels
d. Four cylinders
e. Two differentials
Q. The work done in compressing 1 kg of air in compression will be least when the value of index is
a. 1.1
b. 1
c. 1.2
d. 1.41
e. 1.5
Q. Separators are generally used in air compressor installations
a. Between after cooler and receiver
b. Before first stage suction
c. Before intercooler
d. After intercooler
e. None of the above
Q. For the same maximum pressure and heat input, the most efficient cycle is
a. Diesel
b. 5 to 10 percent
c. Brayton
d. Otto
e. Dual
Q. In compression ignition engines swirl is
a. Circular motion imparted to gases after combustion
b. Circular motion imparted to suction air
c. Radial motion imparted to fuel air mixture
d. Directional movement of fuel spray
e. None of the above
Q. Which of the following acts as a step up transformer in the ignition circuit of a petrol engine?
a. Battery
b. Coil
c. Plug
d. Distributor
e. Magneto
Q. Tidal power is the power generated from
a. Raw sea water
b. Waves of the ocean
c. Rise and fall tides
d. Thermal energy of ocean water
e. Chemicals in sea water
Q. Thermal efficiency of a spark ignition engine at full load usually is in the range
a. 30 to 35 percent
b. 50 to 70 percent
c. 70 to 90 percent
d. 10 to 25 percent
e. 5 to 10 percent