84001. If p1 is the pressure of air entering the L.P, cylinder and p3 is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by
84002. Reheating in a gas turbine
84003. In a single stage, single acting reciprocating air compressor, without clearance, the workdone on the air during isentropic compression is __________ the heat required to raise the temperature of air from T1 to T2 at a constant pressure.
84004. Workdone by an air compressor __________ upon the way in which the air is compressed.
84005. In a compressor, work is done on the piston during suction of air and work is done by the piston during compression as well as delivery of air.
84006. Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.
84007. The mass of gas turbine per kW developed is about __________ as that of an I.C. engine.
84008. In a centrifugal compressor, the ratio of the __________ to the blade velocity is called slip factor.
84009. In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in
84010. The air is delivered __________ in one revolution in case of a three-lobbed rotor.
84011. The performance of air compressor at high altitudes will be __________ as compared to that at sea level.
84012. In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at
84013. In a centrifugal compressor, the air enters the impeller axially and leaves the vane radially.
84014. In gas turbines, the work input with intercooling is __________ the work input with no intercooling.
84015. The compressor capacity will be __________ if the temperature of intake air is lowest.
84016. For perfect intercooling in a three stage compressor,
84017. A machine used to raise the pressure of air is called
84018. The overall efficiency of the compressed air system is the
84019. In a jet engine, the compression varies as the square of the speed.
84020. In a single acting reciprocating air compressor, without clearance, the compression of air may be
84021. The axial flow compressor is preferred in air-craft gas turbines because of
84022. Which of the following statement is correct as regard to centrifugal compressors?
84023. The ratio of the net work obtained from the gas turbine plant to the turbine work is known as
84024. 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.
84025. In jet propulsion power unit, the inlet duct of diverging shape is used for converting kinetic energy of air into pressure energy.
84026. The temperature of air at the beginning of the compression stroke is __________ the atmospheric temperature.
84027. The compressor efficiency is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.
84028. In a gas turbine, air is obtained from the atmosphere and compressed in an air compressor.
84029. 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
84030. Gas turbine as compared to internal combustion engine
84031. A closed cycle gas turbine consists of a
84032. For maximum work, the reheating should be done to an intermediate pressure of (where p1 = Maximum pressure, and p2 = Minimum pressure)
84033. 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)
84034. The pressure of air at the beginning of the compression stroke is __________ the atmospheric pressure.
84035. The pressure ratio in a centrifugal compressor can be increased by increasing the tip speed and lowering the inlet temperature.
84036. Free air is the air at atmospheric conditions at any specific location.
84037. A gas turbine used in air-craft should have low weight and small frontal area.
84038. A closed cycle gas turbine works on
84039. 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.
84040. Air motors work on the cycle which is the reverse of the reciprocating air compressor cycle.
84041. Which of the following statement is correct relating to rocket engines ?
84042. In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.
84043. Euler's equation can be used for
84044. A rocket engine uses __________ for the combustion of its fuel.
84045. The perfect intercooling, in multistage compression, means that the temperature of air at inlet to subsequent stages is equal to the initial temperature.
84046. In a compressed air system, the temperature of air discharged from the air motor is __________ than the initial compressor intake temperature.
84047. The efficiency of roots blower __________ with the increase in pressure ratio.
84048. The operation of lifts, rams and pumps make use of compressed air.
84049. A jet engine has
84050. A receiver in compressor installations is used to damp pressure waves in compressor discharge.
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