The self-ignition temperature of diesel oil as compared to petrol is
A.Higher
B.Lower
C.Same
D.Varies considerably
E.Depends on other factors
Category: Heat Engines Mcqs
A hot short metal is
A.Brittle when heated
B.Brittle when cold
C.Ductile at low temperatures
D.Ductile at high temperatures
E.None of the above
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
This purpose of supercharging an engine is
A.To increase the power output of engine
B.To reduce specific fuel consumption
C.To reduce the noise of engine
D.To improve cooling of cylinders
E.None of the above
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
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
