Related Questions

The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,
A Will be higher
B Will be lower
C Will remain unaffected
D May be higher or lower depending upon the nature of non-condensable gases
If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor.
A Increase
B Decrease
C Not affect
D Increase the condensing film co-efficient as well as
Presence of a non-condensing gas in a condensing vapour
A Increases the rate of condensation
B Decreases thermal resistance
C Is desirable to increase the film co-efficient
D None of these
One fourth the price of a TV is equal to 1/6th the price of a refrigerator. If the total cost of the TV and the refrigerator is Tk 60000, what is the price of the TV?
A Tk 22000
B Tk 24000
C Tk 27500
D None of these
The film co-efficient between condensing vapour and metal wall increases with
A Increasing temperature of the vapour
B Decreasing temperature of the vapour
C Increasing viscosity of the film of condensate
D Increasing temperature drop
In case of non-condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the condenser pressure.
A Equal to
B Lower than
C Higher than
D None of these
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 film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is
A More
B Less
C Some
D Either more or less ; depends on the nature of vapor
For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.
A Half
B Twice
C Thrice
D Five times
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in
A Parallel flow
B Counter flow
C Cross flow
D All of these

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