Hydraulic Machines

Question: In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows.
[A].

Correct

[B].

Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

Question: Head developed by a centrifugal pump is
[A].

proportional to diameter of impeller

[B].

proportional to speed of impeller

[C].

proportional to diameter and speed of impeller

[D].

none of the above

Answer: Option C

Explanation:

No answer description available for this question.

Question: A reciprocating pump is also called a __________ displacement pump.
[A].

positive

[B].

negative

Answer: Option A

Explanation:

No answer description available for this question.

Question: A reciprocating pump is suitable for less discharge and higher heads.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the
[A].

kinetic head

[B].

velocity head

[C].

manometric head

[D].

static head

Answer: Option C

Explanation:

No answer description available for this question.

Question: Multi-stage centrifugal pumps are used to
[A].

give high discharge

[B].

produce high heads

[C].

pump viscous fluids

[D].

all of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)
[A].

Q = π.D.Vf

[B].

Q = π.b.Vf

[C].

Q = π.D.b.Vf

[D].

Q = D.b.Vf

Answer: Option C

Explanation:

No answer description available for this question.

Question: Overall efficiency of a centrifugal pump is the ratio of
[A].

energy available at the impeller to the energy supplied to the pump by the prime mover

[B].

actual workdone by the pump to the energy supplied to the pump by the prime mover

[C].

energy supplied to the pump to the energy available at the impeller

[D].

manometric head to the energy supplied by the impeller per kN of water

Answer: Option B

Explanation:

No answer description available for this question.

Question: Mechanical efficiency of a centrifugal pump is the ratio of
[A].

energy available at the impeller to the energy supplied to the pump by the prime mover

[B].

actual workdone by the pump to the energy supplied to the pump by the prime mover

[C].

energy supplied to the pump to the energy available at the impeller

[D].

manometric head to the energy supplied by the impeller per kN of water

Answer: Option A

Explanation:

No answer description available for this question.

Question: Manometric head is the actual head of water against which a centrifugal pump has to work.
[A].

Correct

[B].

Incorrect

Answer: Option A

Explanation:

No answer description available for this question.