Turbo Machines Multiple Choice Questions & Answers Pdf - 2

Question: 6

Overall efficiency of a gas turbine is

(A) more than Otto or Diesel cycle efficiency

(B) less than Diesel cycle efficiency

(C) equal to Carnot cycle efficiency

(D) equal to Rankine cycle efficiency

Question: 7

Choking is

(A) fixed mass flow rate regardless of pressure ratio

(B) variation of mass flow rate in inverse proportion to pressure ratio

(C) variation of mass flow rate in proportion to pressure ratio

(D) none of the above

Question: 8

In a nozzle, if back pressure is equal to inlet pressure

(A) flow is supersonic in converging as well as supersonic sections

(B) flow is subsonic in diverging section

(C) maximum flow occurs

(D) no flow occurs

Question: 9

Air fuel ratio for a gas turbine is closer to

(A) 10 : 1

(B) 15 : 1

(C) 20 : 1

(D) 60 : 1

Question: 10

A diffuser is used to

(A) decrease velocity and increase pressure

(B) decrease velocity as well as pressure

(C) increase velocity as well as pressure

(D) increase velocity and decrease pressure