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০০। A 3 m3/min compressor means that it
- ক) compresses 3 m3/min of standard air
- খ) compresses 3 m3/ min of free air
- গ) delivers 3 m3/ min of compressed air
- ঘ) delivers 3 m3/ min of compressed air at delivery pressure
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০১। A centrifugal compressor is an axial flow compressor.
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০২। A closed cycle gas turbine consists of a
- ক) compressor
- খ) heating chamber
- গ) cooling chamber
- ঘ) all of these
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০৩। A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
- ক) same
- খ) lower
- গ) higher
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০৪। A closed cycle gas turbine works on
- ক) Carnot cycle
- খ) Rankine cycle
- গ) Ericsson cycle
- ঘ) Joule cycle
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০৫। A compressor at high altitudes will require __________ power.
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০৬। A compressor mostly used for supercharging of I.C. engines is
- ক) radial flow compressor
- খ) axial flow compressor
- গ) roots blower
- ঘ) reciprocating compressor
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০৭। A compressor must be driven by some prime mover.
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০৮। A gas turbine used in air-craft should have low weight and small frontal area.
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০৯। A jet engine has
- ক) no propeller
- খ) propeller in front
- গ) propeller at back
- ঘ) propeller on the top
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১০। A large clearance Volume in a reciprocating compressor results in
- ক) reduced volume flow rate
- খ) increased volume flow rate
- গ) lower suction pressure
- ঘ) lower delivery pressure
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১১। A machine used to raise the pressure of air is called
- ক) gas turbine
- খ) I.C engine
- গ) compressor
- ঘ) air motor
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১২। A receiver in compressor installations is used to damp pressure waves in compressor discharge.
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১৩। A regenerator in a gas turbine improves thermal efficiency.
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১৪। A rocket engine uses __________ for the combustion of its fuel.
- ক) surrounding air
- খ) compressed atmospheric air
- গ) its own oxygen
- ঘ) none of these
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১৫। A rocket works with maximum overall efficiency when air-craft velocity is __________ the jet velocity.
- ক) equal to
- খ) one-half
- গ) double
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১৬। A rotary compressor is driven by an
- ক) electric motor
- খ) engine
- গ) either (a) or (b)
- ঘ) none of these
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১৭। A simple turbo-jet engine is basically a gas turbine engine equipped with a propulsive nozzle and diffuser.
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১৮। A turbo-prop is preferred to turbo-jet because
- ক) it has high propulsive efficiency at high speeds
- খ) it can fly at super sonic speeds
- গ) it can fly at high elevations
- ঘ) it has high power for take off
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১৯। Air motors work on the cycle which is the reverse of the reciprocating air compressor cycle.