Rank of coal is based on
A.Fixed carbon and heating value
B.Ash content
C.Ash and moisture content
D.Size
E.None of the above
Category: Heat Engines Mcqs
For combustion of one kg of carbon the quantity of oxygen required (air contains 23% by wight of oxygen) is
A.2.62 kg
B.3.67 kg
C.8 kg
D.11.6 kg
E.12 kg
In power station practice ‘spinning reserve’ is
A.Reserve generating capacity that is in operation but in service
B.Reserve generating capacity that is connected to bus and ready to take load
C.Reserve generating capacity that is available for service but not in operation
D.Capacity of the part of plant that remains under maintenance
If an air cooled compressor gets over-heated during operation, the probable cause cannot be
A.Intake fliter clogged
B.Insufficient lubricating oil
C.Valve strips broken
D.Leadage in intercooler
E.Direction of rotation wrong
The efficiency of a jet propulsion unit is generally high at altitudes of
A.1000 metres
B.5000 metres
C.7500 metres
D.9000 metres
E.More than 10,000 metres
Which fuel has maximum resistance to detonation
A.Toluene
B.Benzene
C.Isoctave
D.n-heptane
E.Alcohol
A closed vessel contains air at 1.2 ata and 57?C. The pressure of air in the vessel if the contents of the vessel are cooled to 37?C would be
A.2.327 ata
B.1.2 ata
C.1.127 ata
D.0.563 ata
E.0.073 ata
1 Torr is equivalent to
A.1 mm Hg
B.13.6 cm of water column
C.760 mm of water
D.760 mm of Hg
E.None of the above
Apart from reducing friction and cooling the surfaces, the function of lubricant in I.C. engines is
A.To improve thermal efficiency
B.To clean the surfaces by carrying away the carbon and metal particles cansed by wear
C.To reduce noise
D.To reduce vibrations
E.None of the above
