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
Category: Heat Engines Mcqs
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
Oil rings are slotted to
A.Provide an escape for the oil that the slot edges cut from the cylinder wall
B.Reduce the bulk
C.Minimise friction
D.Better lubrication of cylinder walls
E.Remove oil from cylinder
For superheated steam in a nozzle the critical pressure ratio is
A.1
B.0.528
C.0.546
D.0.577
E.0.64
Which one of the following factors will not assist in improving thermal efficiency of a compression ignition engine?
A.Fine atomisation and even distribution of fuel
B.Minimum heat loss during combustion
C.Clear exhaust
D.High surface to volume ratio
E.Any of the above
Hot spots are
A.Defects in S.I.engines
B.The hottest spots in engines
C.The spots where heavier fractions of fuel are vaporised
D.Do not exist in engines
E.Hottest point within engine cylinder
A gas used in gas engine trial was tested in a Boys Calorimeter. The pressure of gas supply was 7 cm of water column. If the barometric pressure is 760 mm of mercury, the absolute pressure of the gas would be
A.0.007 kg/sq-cm
B.0.14 kg/sq-cm
C.1.04 kg/sq-cm
D.1.14 kg/sq-cm
E.None of the above
