Related Questions

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 area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is
A Less
B More
C Same
D More/less depending on compressor capacity
The efficiency of Diesel cycle approaches to Otto cycle efficiency when
A Cut-off is decreased
B Cut-off is constant
C Cut-off is increased
D Cut-off is zero
In the Emerson efficiency plan, a worker receives only his daily wage and no bonus is paid till his efficiency reaches
A 50%
B 66.67%
C 75%
D 80%

Next steps