Top 350+ Solved Heat Engines MCQ Questions Answer
Q. During detonation in a petrol engine
a. The rate of speed variation is high
b. The rate of exhaust discharge is high
c. The rate of temperature rise is high
d. The rate of pressure rise is high
e. None of the above
Q. Volume of air at 27?C is 2 cu-m. What will be the volume at 327?C
a. 3 cm-m
b. 12 cm-m
c. 4 cu-m
d. 2 cu-m
e. 8 cu-m
Q. The air standard efficiency of a Diesel engine depends on
a. Speed
b. Torque
c. Thermodynamic properties of working fluid
d. Cetane value of fuel used
e. Compression ratio
Q. The size of a steam engine is 200 x 250 - 300 r.p.m. In this 200 indicates
a. Shaft diameter
b. Steam pressure in 1bs/sq. in.
c. Piston stroke
d. Horse power
e. Cylinder bore
Q. In multistages turbines by introducting reheating
a. Thermal efficiency improves
b. The output of turbine increases
c. Work done by compressor reduces
d. The ratio compressor compressor work/turbine output decreases
e. None of the above
Q. In order to reduce wear and eliminate scuffing, piston ring in internal combustion engines are
a. Made of soft material
b. Provided with grooves
c. Lubricated thoroughly
d. Made of square section
e. Plated with chromium, cadmium or phosphate
Q. The ends of piston rod in steam engines are connected to
a. Connecting rod and cross-head
b. Crankshaft and cross-head
c. Piston and crankshaft
d. Piston and cross-head
e. Connecting rod and crankshaft
Q. One horse power-hr is equal to
a. 1 kWh
b. 632 kcal
c. 100,000 kJ
d. 107 Joules
e. None of the above
Q. Which of the following boiler uses exhaust of the engine to produce draught?
a. Lamont boiler
b. Cornish boiler
c. Babcock and wilcox boiler
d. Lancashire boiler
e. Locomotive boiler
Q. In jet engine the compression ratio
a. Varies with altitude
b. Varies with speed
c. Varies as square of speed
d. Remains constant
e. None of the above
Q. Pour point is the temperature at which oil
a. Starts cracking
b. Will start flowing
c. Barely flows
d. Will ignite
e. Will give off vapours enough for ignition
Q. Which one of the following factors will not assist in smooth running of a compression ignition engine?
a. Moderate rate of pressure rise
b. Short delay period
c. Minimum of after burning
d. High ignition temperature of fuel
e. None of the above
Q. In case of an opposed piston engine the combustion chamber
a. Is not provided
b. Is formed between two piston tops
c. Is provided towards crank case side
d. Is fitted outside the cylinder
e. None of the above
Q. Specific heat is
a. The amount of heat required to raise the temperature of a unit quantity of substance through 1?C
b. The amount of heat requred to change the state or condition under which a substance exists without changing its temperature
c. The ratio of quantity of heat required to raise the temperature of a given weight of any substance through 1?C to the quantity of heat required to raise the temperature of same weight of water through 1?C
d. The heat sensed by a mercury thermometer
e. None of the above
Q. In a diesel engine the injection pressure is of the order of
a. 1500 kg/cm2
b. 100 kg/cm2
c. 1000 kg/cm2
d. 40 kg/cm2
e. 500 kg/cm2