The air standard efficiency of a Diesel engine depends on
A.Compression ratio
B.Speed
C.Torque
D.Cetane value of fuel used
E.Thermodynamic properties of working fluid
Category: Heat Engines Mcqs
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
Most of the heat generated in I.C. engines is transferred to surrounding medium by
A.Conduction only
B.Convection only
C.Conduction and convection
D.Radiation only
E.None of the above
Air fuel ratio for a jet engine is of the order of
A.10 ; 1
B.15 ; 1
C.20 ; 1
D.60 ; 1
E.400 ; 1
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
As per IS specifications the endurance test for engines is conducted for
A.100 hours
B.200 hours
C.300 hours
D.500 hours
E.1000 hours
A fan is being used under certain conditions. If the fan speed is doubled the power requirement will be
A.Unchanged
B.Double of the original
C.Four times
D.8 times
E.16 times
A compound pressure gauge measures
A.Compound pressures
B.Complex pressures
C.Variable pressures
D.Positive and negative pressures
E.Average pressure
The knocking tendency in a compression ignition engine for a given fuel will
A.Enhance by reducing compression ratio
B.Enhance by increasing compression ratio
C.Depend on other factors
D.Increase to certain limits and then no change
E.None of the above
Flash point for diesel fuel oil should be
A.Minimum 49?C
B.Maximum 49?C
C.Maximum 100?C
D.Maximum 200?C
E.None of the above
