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Test: Fluid Machines - 3 - Mechanical Engineering MCQ


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20 Questions MCQ Test Fluid Mechanics for Mechanical Engineering - Test: Fluid Machines - 3

Test: Fluid Machines - 3 for Mechanical Engineering 2024 is part of Fluid Mechanics for Mechanical Engineering preparation. The Test: Fluid Machines - 3 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Fluid Machines - 3 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Fluid Machines - 3 below.
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Test: Fluid Machines - 3 - Question 1

A hydraulic turbine has a discharge of 5 m3/sec, when operating under a head of 20 m with a speed of 500 rpm, If it is to operate under a head of 15 m, for the same discharge, the rotational speed in rpm will approximately be

Test: Fluid Machines - 3 - Question 2

The cavitation and pitting can be prevented by creating which one of the following conditions? .

Detailed Solution for Test: Fluid Machines - 3 - Question 2

Cavitation occurs due to pressure falling below vapour pressure. Reducing the velocity head will increase pressure head and cavitation can be prevented.

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Test: Fluid Machines - 3 - Question 3

The overall efficiency of a Pelton turbine is 70%. If the mechanical efficiency is 85%, what is its hydraulic efficiency?

Detailed Solution for Test: Fluid Machines - 3 - Question 3

η0 = ηn x ηm
∴  hydraulic eff. = (0.70/0.85) x 100 = 82.4%

Test: Fluid Machines - 3 - Question 4

The function of an air vessel in a reciprocating pump is to obtain :

Detailed Solution for Test: Fluid Machines - 3 - Question 4

Air vessel ensure continuous supply of water at a uniform rate in a reciprocating pump. It results in saving of work against friction.
Percentage of work saved during stroke in
(i) single acting pump is 84.8%
(ii) double acting pump is 39.2%
The air vessels change the indicator diagram of the reciprocating pump.

Test: Fluid Machines - 3 - Question 5

A centrifugal pump gives maximum efficiency when its impeller blades are

Test: Fluid Machines - 3 - Question 6

The speed factor of a Peiton turbine for maximum efficiency condition is about

Detailed Solution for Test: Fluid Machines - 3 - Question 6

Speed factor: The ratio of the bucket speed uand the theoretical velocity of jet 

Test: Fluid Machines - 3 - Question 7

The specific speed of a pump of discharge Q, working under a head H at an RPM ‘n' is NSP =

Test: Fluid Machines - 3 - Question 8

If two pumps identical in all aspects and each capable of delivering a discharge Q against a head H are connected

Test: Fluid Machines - 3 - Question 9

Cavitatio  parameter σ is defined in terms of NPSH (net. positive suction head) and net head H as, σ=

Test: Fluid Machines - 3 - Question 10

Cavitation in fluid flow occurs when

Test: Fluid Machines - 3 - Question 11

The minimum head a cross the impeller for the delivery to commence is

Test: Fluid Machines - 3 - Question 12

Rotodyn a micpumps a reclassified as
1. centrifugal pumps
2. screw pumps
3. propeller pumps
Which of these statements are correct?

Test: Fluid Machines - 3 - Question 13

For lifting oil from very deep oil wells, which of the pumps are used?

Test: Fluid Machines - 3 - Question 14

The efficiency of a centrifugal pump is expressed in terms of
1. manometer efficiency
2. volumetric efficiency
3. mechanical efficiency
4. overall efficiency
Which of these statements are correct?

Test: Fluid Machines - 3 - Question 15

A two-dimensional jet strikes a fixed two- dimensional plane at 45° to the normal to the plane, This causes the jet to split into two streams whose discharges are in the ratio

Detailed Solution for Test: Fluid Machines - 3 - Question 15


Q = 180° - 45°

Test: Fluid Machines - 3 - Question 16

To generate 10,000 HP under a head of 81 m while working at a speed of 500 rpm, the turbine of choice would be

Detailed Solution for Test: Fluid Machines - 3 - Question 16

Power developed in kW
= 10,000 x 0.756 = 7560 kW

Test: Fluid Machines - 3 - Question 17

Owing to a sudden closure of turbines in a powerhouse:

Detailed Solution for Test: Fluid Machines - 3 - Question 17

If the sluice gate of the head race channel is suddenly closed (for closing turbine) positive surge will move upstream. If the sluice gate is suddenly opened (to start turbine) positive surge will move downstream.

Test: Fluid Machines - 3 - Question 18

A centrifugal pump running at 500 rpm and at its maximum efficiency is delivering a head of 30 m at a flow rate of 60 liters per minute. If the rpm is changed to 1000, then the head H in metres and flow rate Q in litres per minute at maximum efficiency are estimated to be

Detailed Solution for Test: Fluid Machines - 3 - Question 18


We also know that specific speed will be constant.

Test: Fluid Machines - 3 - Question 19

Tests were conducted on a francis turbine of 0.8 m diameter under a head of 9m. The turbine running at 240 rpm develops 84.5 kW and the water consumption was 1.2 m3/s. If the some turbine operated under a head of 16 m, the new discharge will be

Detailed Solution for Test: Fluid Machines - 3 - Question 19

Test: Fluid Machines - 3 - Question 20

The overall efficiency of a turbine is dependent on the hydraulic loss, volumetric losses and mechanical losses represent by respective efficiencies. It is related to these by the following relationship

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