Related Questions

The maximum propulsive efficiency of a turbojet engine is at a speed of
A 1000 km/h
B 2000 km/h
C 2400 km/h
D 3000 km/h
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
A Remain same
B Decrease
C Increase
D None of the above
The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is
A just one
B always greater than one
C always less than one
D none of the above
When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
A Zero
B $$\frac{1}{5}$$
C $$\frac{4}{5}$$
D 1
When cut-off ratio is ________; the efficiency of Diesel cycle approaches to Otto cycle efficiency
A $$\frac{1}{4}$$
B Zero
C $$\frac{1}{5}$$
D 2
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
A Heat rejection is lower
B Expansion and compression are isentropic
C Combustion is at constant volume
D Maximum temperature is higher
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called
A Net efficiency
B Efficiency ratio
C Relative efficiency
D Overall efficiency
The ratio of the indicated thermal efficiency to the air standard efficiency is known as
A Mechanical efficiency
B Overall efficiency
C Volumetric efficiency
D Relative efficiency
The overall isothermal efficiency of the compressor is defined as the ratio of
A Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
B Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
C Volume of free air delivery per stroke to the swept volume of the piston
D Isentropic power to the power required to drive the compressor
The overall isothermal efficiency of compressor is defined as the ratio of
A Isothermal h.p. to the BHP of motor
B Isothermal h.p. to adiabatic h.p.
C Power to drive compressor to isothermal h.p.
D Work to compress air isothermally to work for actual compression

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