Chemical Engineering

Question: Centrifugal pump can’t be used to pump
[A].

molten sodium (used as a coolant in Fast Breeder Reactor).

[B].

moderately viscous vegetable oil used in soap industry.

[C].

thick molten soap at 80°C.

[D].

none of the above.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Multistage centrifugal pumps are generally used for
[A].

high head.

[B].

low head but high discharge.

[C].

highly viscous liquid.

[D].

slurries of high solid concentration.

Answer: Option A

Explanation:

No answer description available for this question.

Question: For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be
[A].

V1 < V2 < V3

[B].

V2 > V1 and V2 > V3

[C].

V1 > V2 > V3

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Question: For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are
[A].

h1 > h2 < h3

[B].

h1 > h2 > h3

[C].

h2 < h1 < h3

[D].

h1 < h2 < h3

Answer: Option A

Explanation:

No answer description available for this question.

Question: Gear pump
[A].

is a positive displacement pump.

[B].

is a centrifugal pump.

[C].

is a non-positive displacement pump.

[D].

can be started with delivery valve closed.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its
[A].

inner diameter

[B].

outer diameter

[C].

thickness

[D].

neither inner nor outer diameter

Answer: Option D

Explanation:

No answer description available for this question.

Question: Disc compensators are provided in large diameter fuel gas carrying pipelines to
[A].

keep the pipe in proper orientation.

[B].

make the pipe joint leak-proof.

[C].

account for contraction/expansion of pipe due to temperature changes of the surroundings.

[D].

account for the pressure variation side the pipeline.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Interstage coolers are provided in a multistage compressor to
[A].

save power in compressing a given volume to a given pressure.

[B].

cool the delivered air.

[C].

achieve the exact delivery pressure.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpmHead = 8 metresFlow = 1000 litres/minutes.If its speed is halved, the new discharge will be __________ litres/minute.
[A].

500

[B].

200

[C].

1000

[D].

750

Answer: Option A

Explanation:

No answer description available for this question.

Question: A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpmHead = 8 metresFlow = 1000 litres/minutes.If its speed is halved, the power consumed now will be __________ hp.
[A].

0.5

[B].

2

[C].

4

[D].

1

Answer: Option A

Explanation:

No answer description available for this question.