Top 350+ Solved Heat Engines MCQ Questions Answer
Q. In a four stroke engine if a valve opens 25? before B.D.C. and closes 10? after T.D.C. the valve should be
a. Puppet valve
b. Cam valve
c. Spring valve
d. Inlet valve
e. Exhaust valve
Q. If the air clearance is removed in a carburettor engine the fuel air ratio will be
a. Higher
b. Lower
c. Not affected
d. Fluctuating
e. None of the above
Q. A fan is being used under certain known conditions. If the speed of fan is doubled the air displaced by the fan
a. Will remain the same
b. Will be doubled
c. Will be four times the original displacement
d. will be either times the original displacement
e. None of the above
Q. The maximum temperature in a gas turbine is of the order of
a. 700?C
b. 2000?C
c. 2500?C
d. 1500?C
e. 1000?C
Q. Which of the following is a part of reciprocating steam engine and not a part of steam turbine plant?
a. Condenser
b. Governor
c. Pressure gauge
d. Cross head
e. All of the above
Q. For same output and same compression ratio four stroke SI engines as compared to two stroke engines have
a. Higher fuel consumption
b. Lower thermal efficiency
c. Higher thermal efficiency
d. Higher exhaust temperatures
e. None of the above
Q. For the same temperature limits and heat input, the most efficient cycle is
a. Carnot
b. Otto
c. Diesel
d. Brayton
e. All of the above have same efficiency
Q. The power for the propulsion of ship is provided by
a. Diesel engines
b. Steam turbines
c. Either (A) and (B) above
d. Batteries
e. Any of the above
Q. The steam trap is used to
a. Superheat the steam
b. Separate condensate from steam
c. Convert superheated steam into the steam
d. Condense the steam
e. Add moisture to steam
Q. Piston ring are plated with chromium, cadmium or phosphate to
a. Reduce wear and eliminate scuffing
b. Improve heat transfer
c. Improve surface finish
d. Prevent clogging
e. Reduce clearance, between rings and cylinder
Q. More test is conducted on
a. Engines with two flywheels
b. Multi-cylinder engines
c. Single cylinder engines
d. High speed engines
e. Slow speed engines
Q. In oil burners air is supplied
a. To assist inflow of oil
b. To prevent clogging of burner
c. To improve combustion efficiency
d. To uniformly spray oil in combustion chamber
e. None of the above
Q. In a compression ignition engine higher combustion chamber wall temperature will
a. Reduce knocking tendency
b. Increase knocking tendency
c. Have no effect
d. Reduce exhaust temperature
e. None of the above
Q. Clapeyron equation is applicable
a. To systems in equilibrium
b. To change of boiling point
c. To change of melting point
d. For change of state when two phases are in equilibrium
e. All of the above
Q. In a system if base load is same as maximum demand, the load factor will be
a. 1
b. 1 percent
c. 0.5 percent
d. Infinity
e. Zero