Top 350+ Solved Heat Engines MCQ Questions Answer
Q. A run-of-river hydro-electric station is one which is
a. Located on a small river
b. Located on a river which does not flow throughout the year
c. Located on a steam flow without water storage
d. Locted on a steam flow with large water storage
e. None of the above
Q. After cooler is used to
a. Cool the air
b. Reduce the volume of air
c. To cause moisture and oil vapour to drop out
d. Remove impurities from air
e. None of the above
Q. Brayton cycle cannot be used in reciprocating engines even for same compression rations and work output because
a. Large volume at low pressure cannot be efficiently harded in reciprocating engines
b. Brayton cycle is less efficient
c. Otto cycle is more efficient
d. Brayton cycle requires large air-fuel ratio
e. Brayton cycle is for slow speed engines only
Q. The mean effective pressure of a diesel cycle having fixed compression ratio will increase if cut off ratio will
a. Increase
b. Decrease
c. Independent of CR
d. Depends on other factors
e. None of the above
Q. Thermal efficiency of C.I. engines on weak mixtures is
a. Higher
b. Lower
c. Unaffected
d. Depends on other factors
e. None of the above
Q. In order to achieve maximum possible fuel economy the design features which will be affected are
a. Volumetric efficiency
b. Compression ratio
c. Method of charging
d. Atomization
e. None of the above
Q. A negative loop in the P-V diagram of a petrol engine is due to
a. Carbon dioxide
b. Suction of air
c. pre-ignition
d. early opening of exnaust valve
e. detonation
Q. A compound pressure gauge measures
a. Average pressure
b. Positive and negative pressures
c. Compound pressures
d. Variable pressures
e. Complex pressures
Q. A barN is
a. A unit of area
b. A unit of length
c. A unit of time
d. A unit of mass
e. None of the above
Q. In isothermal compression
a. There is no gain internal energy
b. Temperature increses very slowly
c. There is no exchange of heat with environment
d. Entropy changes is zero
e. None of the above
Q. In Parsons reaction turbine
a. The fixed and moving blades are identical
b. The velocity biagram is unsymmetrical about a vertical centre line
c. The degree of reaction is
d. The fixed blades are smaller in size as compared to moving blades
e. The fixed blades are larger in size compared to fixed blades
Q. For combustion of one kg of carbon the quantity of oxygen required (air contains 23% by wight of oxygen) is
a. 12 kg
b. 8 kg
c. 2.62 kg
d. 11.6 kg
e. 3.67 kg
Q. For spark ignition engines fuel in order of decreasing knock tendency are
a. Paraffins, aromatics, naphthenes
b. Paraffins, naphthenes, armatics
c. Aromatics, paraffins, naphthenes
d. Naphthenes, aromatics, paraffins
e. Naphthenes, paraffins