Which of the following statement is correct relating to rocket engines ?
A closed cycle gas turbine consists of a
Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.
Which of the following statement is correct as regard to centrifugal compressors?
The efficiency of roots blower __________ with the increase in pressure ratio.
In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at
In a gas turbine, air is obtained from the atmosphere and compressed in an air compressor.
A closed cycle gas turbine works on
In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.
The mass of gas turbine per kW developed is about __________ as that of an I.C. engine.
A machine used to raise the pressure of air is called
In a four stage compressor, if the pressure at the first and third stage are 1 bar andbar, then the delivery pressure at the fourth stage will be
The ratio of the net work obtained from the gas turbine plant to the turbine work is known as
The operation of lifts, rams and pumps make use of compressed air.
In a centrifugal compressor, the air enters the impeller axially and leaves the vane radially.
In open cycle turbo-jet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the
The clearance, in a single stage, single acting reciprocating air compressor does not effect the workdone on the air and the power required for compressing the air.
Euler's equation can be used for
The intercooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p1 = Intake pressure of air, p2 = Intercooler pressure, and p3 = Delivery pressure of air)
In a centrifugal compressor, the ratio of the __________ to the blade velocity is called slip factor.
The overall efficiency of the compressed air system is the
The compressed air may be used
The process, which causes the air to enter the impeller blades of a centrifugal compressor at __________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.
A jet engine has
In gas turbines, the work input with intercooling is __________ the work input with no intercooling.
Gas turbine as compared to internal combustion engine
Air motors work on the cycle which is the reverse of the reciprocating air compressor cycle.
A rocket engine uses __________ for the combustion of its fuel.
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