Power Generation

The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is__________?

A. 0.555
B. 0.578
C. 0.5457
D. 0.6

The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is___________?

A. 0.6
B. 0.578
C. 0.555
D. 0.5457

The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation__________?

A. pvls=C
B. pv1126 = C
C. pv1A = C
D. pv = C

The efficiency of chimney is approximately______________?

A. 80%
B. 40%
C. 20%
D. 0.25%

The pressure at the furnace is minimum in case of___________?

A. forced draught system
B. induced draught system
C. balanced draught system
D. natural draught system

For the induced draught the fan is located_______________?

A. near bottom of chimney
B. near bottom of furnace
C. at the top of the chimney
D. anywhere permissible

The artificial draught normally is designed to produce____________?

A. less smoke
B. more draught
C. less chimney gas temperature
D. all of the above

Artificial draught is produced by____________?

A. air fans
B. steam jet
C. fan or steam jet
D. all of the above

For the same draught produced the power of induced draught fan as compared to forced draught fan is___________?

A. less
B. more
C. same
D. not predictable

The draught in locomotive boilers is produced by_____________?

A. forced fan
B. chimney
C. steam jet
D. only motion of locomotive