In a spark ignition engine supercharging
A.Increases knocking tendency
B.Decreases knocking tendency
C.There is no effect on knocking
D.Knocking is affected by other factors
Category: Heat Engines Mcqs
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
A jet engine has
A.Propeller in front
B.Propeller in back
C.One propeller in front and one propeller in back
D.No propeller
E.None of the above
Load curve is the plot of
A.Load versus generatng capacity
B.Load versus current
C.Load versus time
D.Load versus cost of power
E.None of the above
A ‘blue’ flame is
A.Non-radiant flame
B.Radiant flame
C.Super high temperature flame
D.Ordinary flame in oil burners
E.None of the above
For spark ignition engines fuel in order of decreasing knock tendency are
A.Paraffins, aromatics, naphthenes
B.Paraffins, naphthenes, armatics
C.Naphthenes, paraffins
D.Naphthenes, aromatics, paraffins
E.Aromatics, paraffins, naphthenes
The lowest temperature upto which a mercury thermometer can be used is
A.0?C
B.? 10?C
C.? 39?C
D.? 173?C
E.? 260?C
Consumption of diesel in a diesel engine per BHP per hour is in the range
A.100-150 gm
B.150-180 gm
C.185-210 gm
D.215-300 gm
E.500-800 gm
Which one of the following acts as ignition accelerator for C.I. engines fuel
A.Acetone peroxide
B.Hydrogen peroxide
C.Armatic compounds
D.n heptane
E.None of above
Brayton cycle cannot be used in reciprocating engines even for same compression rations and work output because
A.Otto cycle is more efficient
B.Brayton cycle is less efficient
C.Brayton cycle is for slow speed engines only
D.Brayton cycle requires large air-fuel ratio
E.Large volume at low pressure cannot be efficiently harded in reciprocating engines
