Top 350+ Solved Heat Engines MCQ Questions Answer
Q. Low grade fuels have
a. Low moisture content
b. Low ash content
c. Low calorific valve
d. Low carbon content
e. None of the above
Q. Free piston engines find application in
a. Compressed air supply
b. Mining installations
c. Gas turbines
d. Supercharging of diesel engines
e. None of the above
Q. In case of supersonic flow through the nozzle, when the cross-section increases in the direction of flow
a. The velocity will decrease in the direction of flow
b. The pressure will increase in the direction of flow
c. The velocity will increase while the pressure will decrease in the direction of flow
d. The velocity will decrease while the pressure will increase in the direction of flow
e. None of the above
Q. The performance of air compressor at high altitudes as compared to that at sea level will be
a. Will depend upon temperature of air
b. Will depend on type of compressor
c. Better
d. Same
e. Inferior
Q. To avoid moisture trubles, the branch connection from compressed air line are taken from
a. Top side
b. Bottom side
c. Left side
d. Any side
e. Right side
Q. Which turbine has identical fixed and moving blades
a. Carbon dioxide
b. De Laval turbine
c. Parson's reaction turbine
d. Rateau's turbine
e. Hero's turbine
Q. A radiation pyrometer is used for temperatures
a. Upto 100?C
b. Below 100?C
c. Above 500?C
d. 250 - 500?C
e. 100 - 250?C
Q. The processes in a Rankine cycle are
a. Two isothermal and two isentropic
b. Two isothermal and two polytropic
c. Two isothermal and two isobaric
d. One constant pressure, one constant volume and two polytropic
e. None of the above
Q. The function of a receiver in compressor installations is
a. To collect compressed air
b. To dempen pulsations or pressure waves incompressor discharge
c. To reduce temperature of compressed air
d. To reduce moisture content of compressed air
e. None of the above
Q. In an analysis report of a sample of coal, the percentage of one of the constituents is specified as 2.5%. This constituent could be
a. Carbon steel
b. Ash
c. Moisture
d. Sulphur
e. None of the above
Q. Apart from reducing friction and cooling the surfaces, the function of lubricant in I.C. engines is
a. To improve thermal efficiency
b. To clean the surfaces by carrying away the carbon and metal particles cansed by wear
c. To reduce noise
d. To reduce vibrations
e. None of the above
Q. During throttle governing of steam engines
a. Cut off of the engine cylinder changes according to the load
b. Pressure of steam supplied does not change with the load
c. Thermal efficiency of the engine reduces
d. Mechanical efficiency of the engine increases
e. None of the above
Q. The efficiency of jet engine is higher at
a. Lower altitudes
b. Higher altitude
c. Low speeds
d. High speeds
e. None of the above
Q. In a compression ignition engine the fuel consumption will increase if the back (exhaust) pressure is
a. Decreased
b. Increased
c. Does not have any effect
d. Depends on other factors
e. None of the above