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QUESTION: 1

When the speed of a centrifugal pump is doubled, the power requiredto drive the pump will:

Solution:

Ans. (a)

QUESTION: 2

Which one of the following pumps is not a positive displacement pump?

Solution:

Ans. (b)

QUESTION: 3

Assertion (A): Pump lifts water from a lower level to a higher level.Reason (R): In pump, mechanical energy is converted into pressureenergy.

Solution:

Ans. (a)

QUESTION: 4

Match List-I (Industrial needs) with List-II (Type of pump) and select the correct answer using the codes given below the Lists:

Solution:

Ans. (b)

QUESTION: 5

The correct sequence of the centrifugal pump components through which the fluid flows is:

Solution:

Ans. (b)

QUESTION: 6

What will be the shape of the velocity triangle at the exit of a radial bladed centrifugal impeller, taking into account slip?

Solution:

Ans. (d)

QUESTION: 7

The power absorbed by a hydraulic pump is directly proportional towhich one of the following?

(Where N is the rotational speed of the pump)

Solution:

Ans. (c)

QUESTION: 8

Consider the following statements pertaining to a centrifugal pump:

1. The manometric head is the head developed by the pump.

2. The suction pipe has, generally, a larger diameter as compared tothe discharge pipe.

3. The suction pipe is provided with a foot valve and a strainer.

4. The delivery pipe is provided with a foot valve and a strainer.

Of these statements:

Solution:

Ans. (c)

QUESTION: 9

A pump running at 1000 RPM consumes 1 kW and generates head of 10m of water. When it is operated at 2000 RPM, its power consumptionand head generated would be:

Solution:

Ans. (d)

QUESTION: 10

A centrifugal pump gives maximum efficiency when its blades are:

Solution:

Ans. (b)

QUESTION: 11

The vanes of a centrifugal pump are generally

Solution:

Ans. (a)

QUESTION: 12

Assertion (A): Multi-stage centrifugal pumps are only of the radial flowtype.

Reason (R): In a multi-stage centrifugal pump, two or more impellersare keyed to a single shaft and enclosed in the same casing, the radialinlet to successive impellers being made through guide vanes.

Solution:

Ans. (b)

QUESTION: 13

If the number of fundamental dimensions equals 'm', then the repeating variables shall be equal to:

Solution:

Ans. (c)

QUESTION: 14

The square root of the ratio of inertia force to gravity force is called

Solution:

Ans. (b)

QUESTION: 15

In flow through a pipe, the transition from laminar to turbulent flowdoes not depend on

Solution:

Ans. (d)

QUESTION: 16

Given power 'P' of a pump, the head 'H' and the discharge 'Q' and the specific weight 'w' of the liquid, dimensional analysis would lead to the result that 'P' is proportional to:

Solution:

Ans. (d)

QUESTION: 17

If the number of fundamental dimensions equals 'm', then the repeating variables shall be equal to:

Solution:

Ans. (c)

QUESTION: 18

Consider the following statements:

1. Dimensional analysis is used to determine the number of variables involved in a certain phenomenon

2. The group of repeating variables in dimensional analysis should include all the fundamental units.

3. Buckingham's π theorem stipulates the number of dimensionless groups for a given phenomenon.

4. The coefficient in Chezy's equation has no dimension.

Which of these are correct?

Solution:

Ans. (d) 1 and 4 are wrong, coefficient in Chezy's equation has dimension [L^{1/2}T^{-1}]

QUESTION: 19

Which one of the dimensionless numbers identifies the compressibility effect of a fluid?

Solution:

Ans. (c)

QUESTION: 20

It is observed in a flow problem that total pressure, inertia and gravityforces are important. Then, similarly requires that

Solution:

Ans. (c)

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