Chemical Engineering

Question: Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft.
[A].

40

[B].

34

[C].

8

[D].

37

Answer: Option C

Explanation:

No answer description available for this question.

Question: Choose the set of pressure intensities that are equivalent.
[A].

4.33 psi, 10 ft. of water, 8.83 inches of Hg.

[B].

4.33 psi, 10 ft. of water, 20.7 inches of Hg.

[C].

10 psi, 19.7 ft. of water, 23.3 inches of Hg.

[D].

10 psi, 19.7 ft. of water, 5.3 inches of Hg.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Capacity of a rotary gear pump can be varied by
[A].

changing the speed of rotation.

[B].

bleeding air into suction.

[C].

bypassing liquid from the suction or discharge line.

[D].

all (a), (6) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a
[A].

pitot tube

[B].

manometer

[C].

rotameter

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: A centrifugal pump loses prime after starting. The reason of this trouble may be
[A].

incomplete priming.

[B].

too high a suction lift.

[C].

low available NPSH and air leaks in the suction pipe.

[D].

all (a), (b), and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Path followed by water jet issuing from the bottom of a water tank will be a
[A].

parabola (vertex being at the opening).

[B].

hyperbola.

[C].

horizontal straight line.

[D].

zig-zag path (which is geometrically undefined).

Answer: Option A

Explanation:

No answer description available for this question.

Question: A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp).
[A].

less head & capacity

[B].

more head

[C].

more capacity

[D].

less head & more capacity

Answer: Option A

Explanation:

No answer description available for this question.

Question: While starting a centrifugal pump, its delivery valve should be kept
[A].

opened.

[B].

closed.

[C].

either opened or closed ; it does not make any difference.

[D].

either opened or closed; depending on the fluid viscosity.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Differential manometer measures the
[A].

atmospheric pressure.

[B].

sub-atmospheric pressure.

[C].

pressure difference between two points.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Foot valves are provided in the suction line of a centrifugal pump to
[A].

avoid priming, every time we start the pump.

[B].

remove the contaminant present in the liquid.

[C].

minimise the fluctuation in discharge.

[D].

control the liquid discharge.

Answer: Option A

Explanation:

No answer description available for this question.