Hydraulic Machines - Section 1 (3)

Directions to Solve

Hydraulic Machines - Section 1

17.

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.

18.

Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and V_f = 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.

19.

In a reciprocating pump, air vessels are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.

A.	True
B.	False

Answer: Option A

Explanation:

No answer description available for this question.

20.

The maximum number of jets, generally, employed in an impulse turbine without jet interference are

A.	two
B.	four
C.	six
D.	eight

Answer: Option C

Explanation:

No answer description available for this question.

21.

Work done by a turbine __________ upon the weight of water flowing per second.

A.	depends
B.	does not depend

Answer: Option A

Explanation:

No answer description available for this question.

22.

The overall efficiency of a reaction turbine is the ratio of

A.	power produced by the turbine to the energy actually supplied by the turbine
B.	actual work available at the turbine to the energy imparted to the wheel
C.	workdone on the wheel to the energy (or head of water) actually supplied to the turbine
D.	none of the above

Answer: Option A

Explanation:

No answer description available for this question.

23.

The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.

A.	Yes
B.	No

Answer: Option B

Explanation:

No answer description available for this question.

24.

Which of the following turbine is preferred for 0 to 25 m head of water?

A.	Pelton wheel
B.	Kaplan turbine
C.	Francis turbine
D.	none of these

Answer: Option B

Explanation:

No answer description available for this question.

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