70601. The efficiency of a jet engine is higher at
70602. In axial flow compressor, exit flow angle deviation from the blade angle is a function of
70603. Rotary compressors are used for delivering
70604. Workdone by a two-stage reciprocating air compressor per cycle is equal to the workdone in LP. cylinder and H.P. cylinder.
70605. A rotary compressor is driven by an
70606. In a centrifugal compressor, an increase in speed at a given pressure ratio causes
70607. A large clearance Volume in a reciprocating compressor results in
70608. A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
70609. Gas turbine as compared to steam turbine
70610. Intercooling in gas turbines
70611. When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is __________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.
70612. The actual volume of air delivered by a compressor, When reduced to the normal temperature and pressure conditions is called compressor capacity.
70613. The compression ratio in a gas turbine is
70614. Intercooling in compressors results in saving of power in compressing given volume of air to a given pressure.
70615. Only rocket engines can be propelled to space because
70616. The maximum combustion pressure in gas turbine is __________ as compared to I.C. engine.
70617. An aftercooler is used to
70618. High air-fuel ratio in gas turbines
70619. The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as
70620. If p1, is the pressure of air entering the L.P. cylinder and p2 is the pressure of air leaving the L.P. cylinder (or intercooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D1 = Dia. of L.P. cylinder, and D2 = Dia. of H.P. cylinder)
70621. The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called
70622. The increase in pressure in a roots blower is entirely due to back flow of air.
70623. The type of rotary compressor used in aeroplanes, is of
70624. An axial compressor gives optimum performance at high speeds and large volume flows.
70625. In a reciprocating air compressor, the compression work per kg of air
70626. The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the
70627. 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
70628. Reheating in a gas turbine
70629. 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.
70630. Workdone by an air compressor __________ upon the way in which the air is compressed.
70631. 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.
70632. Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.
70633. The mass of gas turbine per kW developed is about __________ as that of an I.C. engine.
70634. In a centrifugal compressor, the ratio of the __________ to the blade velocity is called slip factor.
70635. In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in
70636. The air is delivered __________ in one revolution in case of a three-lobbed rotor.
70637. The performance of air compressor at high altitudes will be __________ as compared to that at sea level.
70638. In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at
70639. In a centrifugal compressor, the air enters the impeller axially and leaves the vane radially.
70640. In gas turbines, the work input with intercooling is __________ the work input with no intercooling.
70641. The compressor capacity will be __________ if the temperature of intake air is lowest.
70642. For perfect intercooling in a three stage compressor,
70643. A machine used to raise the pressure of air is called
70644. The overall efficiency of the compressed air system is the
70645. In a jet engine, the compression varies as the square of the speed.
70646. In a single acting reciprocating air compressor, without clearance, the compression of air may be
70647. The axial flow compressor is preferred in air-craft gas turbines because of
70648. Which of the following statement is correct as regard to centrifugal compressors?
70649. The ratio of the net work obtained from the gas turbine plant to the turbine work is known as
70650. 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.