Related Questions

When the cross-section of a nozzle increases continuously from entrance to exit, it is called a
A Divergent nozzle
B Convergent nozzle
C Convergent-divergent nozzle
D None of these
The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
A Remains constant
B Decreases
C Increases
D None of these
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
A Choked
B Under-damping
C Over-damping
D None of these
A nozzle is said to be a convergent nozzle
A When the cross-section of the nozzle increases continuously from entrance to exit
B When the cross-section of the nozzle decreases continuously from entrance to exit
C When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
D None of the above
The exit cone angle in case of a standard venturimeter is __________ the entrance cone angle.
A Smaller than
B Greater than
C Equal to
D Either A or B
The critical pressure ratio of a convergent nozzle is defined as
A the ratio of outlet pressure to inlet pressure of nozzle
B the ratio of inlet pressure to outlet pressure of nozzle
C the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is min-imum
D the ratio of outlet pressure to inlet pressure only when mass flow rate = c
The entrance and exit curves of a rotary have
A equal radii and equal widths of pavement
B equal radii but pavement width is more at entrance than at exit curve
C equal pavement widths but radius is more at entrance curve than at exit curve
D different radii and different widths of pavement
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will
A Increase
B Decrease
C Remain unchanged
D Either increase or decrease; depends on the coolant flow rate
The friction in the nozzle __________ exit velocity of steam.
A Has no effect on
B Decreases
C Increases
D None of these
The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
A Remains same
B Decreases
C Increases
D None of these

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