Top 350+ Solved Heat Engines MCQ Questions Answer
Q. For same heat input and same compression ratio
a. Otto cycle and Diesel cycle are equally efficient
b. Otto cycle is less efficient than Diesel cycle
c. Otto cycle is more efficient than Diesel cycle
d. Efficiency depends mainly on working substance
e. None of the above
Q. The volumetric efficiency of a well adjusted engine at full load may be
a. 40 to 55 percent
b. 10 to 30 percent
c. 75 to 95 percent
d. 50 to 65 percent
e. 30 to 45 percent
Q. In Ambassador car, the engine is
a. Multi-cylinder type
b. V-type
c. Air cooled and reciprocating engines
d. Horizontal
e. Constant speed type
Q. Dehydration means
a. Removing hydrogen from a mixture
b. Removing hydrogen from a hydrocarbon
c. Removing water from any matter
d. Removing hydrides from any matter
e. Any of the above
Q. Absolute pressure is
a. Gauge pressure
b. Gauge pressure + 1.03 kg/cm2
c. Gauge pressure-atmospheric pressure
d. Gauge pressure + atmospheric pressure
e. None of the above
Q. Samples of exhaust gases from following engines have been collected
a. Diesel engine
b. Gas engine
c. 600;1
d. Petrol engine
e. Jet propulsion unit
Q. Normally the colour of exhaust from a petrol engine is
a. Reddish
b. Black
c. Yellowish
d. Bluish
e. Violet
Q. The boilers using lignite as fuel do not use
a. Horizontal burner, pulverized fuel
b. Travelling grate stoker
c. U-flame pulverized fuel burner
d. Speader stoker
e. Underfeed stoker
Q. Cetane number of diesel generally used in India is in the range
a. 55 to 65
b. 40 to 55
c. 20 to 25
d. 15 to 20
e. 10 to 15
Q. Scavenging efficiency of a four stroke diesel engine is
a. In the range 80 to 95 percent
b. In the range 50 - 80 percent
c. Below 50 percent
d. Between 100% and 95%
e. None of the above
Q. The bottom ring on the piston is known as
a. Oil ring
b. Scrapper ring
c. Compression ring
d. Groove ring
e. Any of the above
Q. In a compression ignition engine squish is
a. Created at the beginning of suction stroke
b. Created at the end of suction stroke
c. Created during combustion
d. Created towards the end of compression stroke
e. None of the above
Q. Which locomotives has the highest unbalanced forces?
a. Electric locomotives
b. Steam locomotives
c. Carbon dioxide
d. Diesel locomotives
Q. For the same power and same speed, the flywheel of a two stroke engine as compared to that of a four stroke engine will be
a. There is no correlation
b. Same size
c. Small
d. Bigger
e. Different shape
Q. The maximum amount of dissociation occurs in the burnt gases of a
a. Carbon dioxide
b. lean mixture
c. chernically correct mixture
d. rich fuel mixture
e. weak fuel mixture