Compressors, Gas Dynamics and Gas Turbines Questions

• In a compressed air system, the temperature of air discharged from the air motor is __________ than the initial compressor intake temperature.
• The compressor efficiency is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.
• Euler's equation can be used for
• The temperature of air at the beginning of the compression stroke is __________ the atmospheric temperature.
• The overall efficiency of the compressed air system is the
• In a centrifugal compressor, the ratio of the __________ to the blade velocity is called slip factor.
• Free air is the air at atmospheric conditions at any specific location.
• For maximum work, the reheating should be done to an intermediate pressure of (where p1 = Maximum pressure, and p2 = Minimum pressure)
• Which of the following statement is correct relating to rocket engines?
• 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.
• The pressure of air at the beginning of the compression stroke is __________ the atmospheric pressure.
• 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.
• The axial flow compressor is preferred in air-craft gas turbines because of
• Which of the following statement is correct as regard to centrifugal compressors?
• The mass of gas turbine per kW developed is about __________ as that of an I.C. engine.
• In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in
• The performance of air compressor at high altitudes will be __________ as compared to that at sea level.
• 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 air enters the impeller axially and leaves the vane radially.
• Reheating in a gas turbine