The forced oil and air circulation method is usual one for transformers of capacities

Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?

A

Long vertical evaporator

B

Horizontal tube evaporator

C

Agitated film evaporator

D

Calenderia vertical tube evaporator

The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.

A

Viscosity

B

Density

C

Thermal conductivity

D

Corrosive nature

A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

A

Is economical in operation

B

Employs high velocity, high heat transfer rate and less heating surface requirement

C

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

D

Both B & C

By walking at 3/4 of his usual speed, a man reaches his office 20 minutes later than usual. His usual time is :

A

30 minutes

B

75 minutes

C

45 minutes

D

60 minutes

After the increase of price of oil by 40%, a family decided to reduce its oil consumption so that the expenditure for oil goes up by 26% only. If the total consumption of oil before the price rise was 10 kg per month, then what is the current consumption of oil per month (in kg)?

A

8

B

8.50

C

9

D

None of these

while there is -- single newspaper with a large national circulation, many magazines have national circulation .

A

not

B

noe

C

no

D

not any one

The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is

A

More

B

Less

C

Same

D

Could be more or less depending on other factors

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in

A

short-circuiting of the secondaries

B

power factor of one of the transformers is leading while that of the other lagging

C

transformers having higher copper losses will have negligible core losses

D

loading of the transformers not in proportion to their kVA ratings

In forced circulation steam boilers, the force is applied

A

To draw water

B

To circulate water

C

To drain off the water

D

All of these

In forced circulation type boiler

A

Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

C

Feed pump is employed to supplement natural circulation in water wall type furnace

D

Water is converted into steam in one pass without any recirculation

The forced oil and air circulation method is usual one for transformers of capacities

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