The angle of taper on draft tube is

In standard taper roller bearings, the angle of taper of outer raceway is

A

5°

B

8°

C

15°

D

25°

The draft or taper allowance on casting is generally

A

1 to 2 mm/m

B

2 to 5 mm/m

C

5 to 10 mm/m

D

10 to 15 mm/m

The capacity of induced draft fan compared to forced draft fan in a boiler is

A

Same

B

More

C

Less

D

Less or more depending on size of boiler

The main advantage of forced draft over natural draft is that

A

Combustion of fuel is complete

B

Smaller height chimney can be used

C

Furnace control is easier

D

All of the above

In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.

A

Less than

B

1.25-1.50 times

C

2.5 times

D

One-fourth of

For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

A

More

B

Less

C

Equal

D

None of these

Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.

A

1.25

B

1.75

C

2.5

D

3.5

For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

A

More heating surface

B

Less heating surface

C

Equal heating surface

D

Heating surface depends on other parameters

In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

A

Infinity

B

Zero

C

Same as average heat transfer co-efficient for tube side

D

None of these

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

A

Decreases the pressure drop

B

Decreases the outlet temperature of cooling medium

C

Increases the overall heat transfer coefficient

D

None of these

The angle of taper on draft tube is

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