26. The reflectivity in a reactor depends upon-

A. The geometry of the reflector

B. Properties of the reflector

C. The energy of the reflector

D. All the above

Click for Answer/Explanation

Correct Answer is D

27. Acoustic velocity in an elastic gaseous medium is proportional to-

A. Absolute temperature

B. Stagnation temperature

C. The square root of stagnation temperature

D. The square root of absolute temperature

Click for Answer/Explanation

Correct Answer is C

28. The device used to heat feed-water by utilizing the heat of the exhaust flue gases before leaving through the chimney is called-

A. Superheater

B. Economizer

C. ID fan

D. Air Preheater

Click for Answer/Explanation

Correct Answer is B

29. Turbo prop-engine has the following additional feature over the turbojet-

A. Diffuser

B. Propeller

C. Starting engine

D. Turbine and Combustion chamber

Click for Answer/Explanation

Correct Answer is A

The turboprop is similar to the turbojet, except that the turbine drives a propeller.

30. In Rayleigh flow at subsonic Mach numbers, heat addition-

A. Decreases static pressure

B. Decreases enthalpy

C. Decreases static temperature

D. Increases static pressure

Click for Answer/Explanation

Correct Answer is D

It flows in a constant area duct without friction with heat transfer.

For better understanding check its graph.

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