Air required for complete combustion of 1 kg of carbon is 11.6 kg. If a fuel contains 88.6% Carbon and 11.4% Hydrogen, the air requirement will
A.Remain unaltered
B.Will decrease
C.Will increase
Category: Heat Engines Mcqs
In a surface condenser near to the air pump suction the vacuum is 500 mm of mercury with 730 mm of mercury height in a barometer. The pressure near the air pump suction would be
A.1230 mm Hg
B.0.69 kg/sq-cm
C.0.687 kg/sq-cm
D.0.313 kg/sq-cm
E.1.213 kg/sq-cm
Compression ratio for diesel engines is generally in the range
A.5 to 10
B.10 to 14
C.14 to 22
D.22 to 25
E.25 to 30
Piston ring are plated with chromium, cadmium or phosphate to
A.Prevent clogging
B.Improve surface finish
C.Improve heat transfer
D.Reduce wear and eliminate scuffing
E.Reduce clearance, between rings and cylinder
In aircraft using gas turbine the cycle used is
A.Simple
B.Regeneration
C.Reheating
D.Reheating with regeneration
E.Multi-stage expansion with reheating and regeneration
In oil burners air is supplied
A.To assist inflow of oil
B.To prevent clogging of burner
C.To improve combustion efficiency
D.To uniformly spray oil in combustion chamber
E.None of the above
The fact that the product of pressure and volume of a fixed amount of gas is approximately a constant value is known as
A.Charle’s law
B.Gay Lusac’s law
C.Dalton’s law
D.Lewis law
E.None of the above
A back pressure generally operates on pressures in the range
A.15 – 40 kg/cm2
B.50 – 100 kg/cm2
C.100 – 150 kg/cm2
D.150 – 200 kg/cm2
E.200 – 350 kg/cm2
A turbo-charger is used
A.In gas turbines for compression of air
B.For supercharging reciprocating engine
C.In jet propulsion units
D.In rockets for producing air fuel mixture
E.None of the above
Standard air is air at
A.Atmospheric conditions at any specific location
B.1 kg/cm2 and atmospheric temperature (Relative humidity of 64%)
C.1 kg/cm2 and 20?C (Relative humidity of 36%)
D.1 kg/cm2 and 0?C (Relative humidity of 36%)
E.None of the above
