Top 350+ Solved Heat Engines MCQ Questions Answer
Q. In a petrol engine the mixture strength for maximum power is
a. 1 ; 5
b. Carbon dioxide
c. 1 ; 30
d. 1 ; 23
e. 1 ; 13
Q. The main purpose of compounding in case of steam turbines is to
a. Reduced speed of rotor
b. Reduced exist losses
c. Improve thermal efficiency
d. All of the above
e. None of the above
Q. Which of the following is not the same as watt?
a. Joule/sec
b. Amperes/volt
c. Ampere x volt
d. (Ampere)2 x ohm
e. None of the above
Q. In an engine radiator, heat is transferred by
a. Conduction
b. Convection
c. Radiation
d. Conduction and convection
e. None of the above
Q. A rich mixture will have an air-fuel ratio
a. Less than chemically correct
b. More than chemically correct
c. Chemically correct
d. Any of the above
e. None of the above
Q. The self-ignition temperature of diesel oil as compared to petrol is
a. Higher
b. Varies considerably
c. Lower
d. Depends on other factors
e. Same
Q. Rank of coal is based on
a. Fixed carbon and heating value
b. Ash content
c. Ash and moisture content
d. Size
e. None of the above
Q. This purpose of supercharging an engine is
a. To increase the power output of engine
b. To reduce specific fuel consumption
c. To reduce the noise of engine
d. To improve cooling of cylinders
e. None of the above
Q. The lowest temperatures that can be measured by a gas thermometer using nitrogen is
a. ? 100?C
b. 0?C
c. ? 200?C
d. ? 10?C
e. ? 137?C
Q. Gusset stays are provided in
a. Steam turbines
b. Steam condensers
c. Chimney
d. Boilers
e. Steam engines
Q. One kg of octane is burnt by four alternative processes given below. In which case the work available will be maximum?
a. When burnt in an open pan in atmosphere
b. When burnt in an internal combustion engine
c. When burnt in a fuel cell
d. When burnt in a reversible process
e. None of the above
Q. For superheated steam in a nozzle the critical pressure ratio is
a. 0.528
b. 0.546
c. 0.64
d. 0.577
e. 1
Q. Dark, black smoke from diesel engines usually results when the engine is
a. Idling
b. Running at slow speeds
c. Running at full speed but under no load conditions
d. Running at full load and full speed
e. Running at light loads
Q. A starting motor should have capacity to generate power equal to
a. IHP
b. IHP-BHP
c. BHP
d. Friction horse power at cranking r.p.m
e. Friction horse power