Steam consumption per kWh of electricity generated in a modern power plant is of the order of
A.1 – 2 kgs
B.2 – 4 kgs
C.5 – 7 kgs
D.8 – 10 kgs
E.10 -12 kgs
Category: Heat Engines Mcqs
A sample having pH value of 5 will be
A.Neutral
B.Acidic
C.Alkalino
Working in the cryogenic range means dealing with temperatures
A.Between – 190?C and absolute zero
B.Below zero degree centigrade
C.Below absolute zero
D.Between zero degree centigrade and 190?C
E.Prevailing normally in the atomsphere
Which of the following is a false stagement: The cause of excessive engine vibrations especially at high speeds in spark ignition engines is
A.Unequal compression of engine cylinders
B.Ignition distributor point not synchrohized
C.Unbalanced crankshaft
D.Unbalanced fan or loose fan blade
E.Unequal distribution of mixture
In a compression ignition engine the fuel consumption will increase if the back (exhaust) pressure is
A.Decreased
B.Increased
C.Does not have any effect
D.Depends on other factors
E.None of the above
For same heat input and same compression ratio
A.Otto cycle and Diesel cycle are equally efficient
B.Otto cycle is less efficient than Diesel cycle
C.Otto cycle is more efficient than Diesel cycle
D.Efficiency depends mainly on working substance
E.None of the above
Piston rings are made of
A.Carbon steel
B.Alloy steel
C.Aluminium
D.Cast iron
E.Copper
Corona is generally accompanied by a faint glow and
A.Hissing noise
B.Spark
C.Heating of conductors
D.Explosion
E.Sparking
In gas and petrol engines thermal efficiency may be expected in the range
A.10 – 15 percent
B.15 to 25 percent
C.30 to 35 percent
D.50 percent
E.60 percent
Intercooling in multistage compressors is done
A.To cool the air at delivery
B.To enable use of small cylinders and eliminate problems of unbalanced forces
C.To minimise the work of compression
D.To supply-air at two different pressures for use
E.To cool air during compression
