Pressure Vessels and Engines MCQ with Answers

146) A rocket engine for the combustion of its fuel

Answer is:

carries its own oxygen

A rocket engine for the combustion of its fuel

147) A rocket works with maximum overall efficiency when air craft velocity is equal to the

Answer is:

half the jet velocity

A rocket works with maximum overall efficiency when air craft velocity is equal to the

148) Propulsion efficiency of the following order-is obtained in practice

Answer is:

0.72

149) The maximum propulsion efficiency of a turbojet is attained at around following speed -

Answer is:

2400km /hr

150) In jet propulsion power unit, the inlet duct of diverging shape is used in order to

Answer is:

convert kinetic energy of air into pressure energy

Explanation:

The propulsion unit which obtains the oxygen for combustion purposes, from the surrounding atmosphere, is known as jet propulsion.

Jet propulsion is used for the propulsion of high speed aircraft, capable of operating at high speed. Jet propulsion may also be used in different types of missiles. In jet propulsion power unit, the inlet duct of diverging shape is used in order to convert kinetic energy of air into pressure energy.