Top 350+ Solved Heat Engines MCQ Questions Answer
Q. Which one of the following symptoms will not show that combustion is becessary complete.
a. Presence of free carbon in exhaust
b. Presence of carbon monoxide in exhaust
c. Presence of oxygen in exhaust
d. Presence of nitrogen in exhaust
e. All of the above
Q. Presence of impurities in ice
a. Does not have any effect
b. Lowers melting point
c. Makes it heavier than water
d. Raises melting point
e. Depends on other factors
Q. Piston rod is provided in
a. Slow speed steam engines
b. Double acting steam engines
c. High speed steam engines
d. Non-condensing steam engines
e. Condensing steam engines
Q. The pressure of steam generated in a boiler as recorded by the Bourdon pressure gauge was 2.2 kg/sq-cm. If the barometer reads 774 mm of mercury the absolute pressure of steam would be
a. 0.2 kg/sq-cm
b. 9.774 kg/sq-cm
c. 1.025 kg/sq-cm
d. 77.4 mm of Hg
e. 3.2526 kg/sq-cm
Q. Which statement is false in case of SI engines
a. Accetylene has least tendency to knocking
b. Adding methyl groups to the side of the carbon chain increases the knocking tendency
c. Unsaturated aliphatic hydrocarbons show less knocking tendency
d. Increasing the length of the carbon chain increases the knocking tendency
e. Centralising the carbon atoms decreases the knocking tendency
Q. In a petrol engine as the speed increases
a. The spark intensity has to be increased
b. The spark intensity has to be reduced
c. The spark has to be advanced
d. The spark has to be retarded
e. None of the above
Q. In thermodynamics, forced processes are those
a. Where a difference is observed in any microscopic property of the system between different times of states
b. Where a difference is observed in any microscopic property of the system between different times or states
c. Which occur in the direction of an intensive property or driving force contained within the system
d. Which require an agency outside the system to force the process
e. None of the above
Q. The steam in a boiler drum is always
a. Dry and saturated
b. Wet or dry and saturated
c. Dry
d. Wet
e. Superheated
Q. Which of the following is false statement? The cause of slow cranking of a gas engine during starting may be
a. Partially discharged battery
b. Under capacity battery
c. High air temperature
d. Heavy engine oil
e. Faulty starting motor
Q. The work done on a compressor will be least when air is taken from
a. As and where available
b. Source of low temperature air
c. A source at 0?C
d. Atmosphere
e. Source of high temperature air
Q. The total length of 40 mid-ordinates on a simple steam engine indicator diagram is 17 cm. The pressure scale is 0.6 kg/sq-cm. The mean effective pressure would be
a. 1.0 kg/sq-cm
b. 1.7 kg/sq-cm
c. 1.0 kg/sq-cm
d. 10.2 kg/sq-cm
e. None of the above
Q. Free air is air at
a. 1 kg/cm2 and 20?C
b. 1 kg/cm2 and atmospheric temperature
c. 1 kg/cm2 and 27?C
d. 1 kg/cm2 and 0?C
e. Atmospheric conditions at any specific location
Q. De-Laval turbine is mostly used
a. For small powers at high speeds
b. For small powers at low speeds
c. For high powers at low speeds
d. For high powers at high speeds
e. None of the above
Q. Air fuel ratio for a jet engine is of the order of
a. 15 ; 1
b. 20 ; 1
c. 60 ; 1
d. 400 ; 1
e. 10 ; 1