Explore topic-wise MCQs in Hydraulic Machines.

This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Hydraulic Machines knowledge and support exam preparation. Choose a topic below to get started.

1.

In Pelton turbine inlet velocity of jet is 85.83m/s, inlet and outlet whirl velocities be 85.83 and 0.143 and blade velocity be 38.62 then its hydraulic efficiency is ___________

A. 90.14%
B. 80%
C. 70%
D. 85%
Answer» B. 80%
Discussion
2.

The expression for hydraulic efficiency is given by

A. 2(V1-u)[1+cos k]u/V1*V1
B. 2(V1+u)[1+cos k]u/V1*V1
C. 2(V1-u)[1-cos k]u/V1*V1
D. 2(V1+u)[1+cos k]u/V1*V1
Answer» B. 2(V1+u)[1+cos k]u/V1*V1
Discussion
3.

In Pelton turbine hydraulic efficiency is product of mechanical efficiency and overall efficiency.

A. True
B. False
Answer» C.
Discussion
4.

In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k” is known as _______

A. Specific density of liquid
B. Density of liquid
C. Specific gravity of liquid
D. Volume of liquid
Answer» C. Specific gravity of liquid
Discussion
5.

The expression for maximum hydraulic efficiency of Pelto turbine is given by ______________

A. (1+cos k)/2 where k is outlet blade angle
B. (2+cos k)/2 where k is outlet blade angle
C. (3+cos k)/2 where k is outlet blade angle
D. (4+cos k)/2 where k is outlet blade angle
Answer» B. (2+cos k)/2 where k is outlet blade angle
Discussion
6.

In Pelton ____________ is ratio of volume of water actually striking the runner and volume of water supplied to turbine.

A. Mechanical efficiency
B. Volumetric efficiency
C. Hydraulic efficiency
D. Overall efficiency
Answer» C. Hydraulic efficiency
Discussion
7.

In Pelton turbine ___________ is defined as ratio between power delivered to runner and power supplied at inlet of turbine.

A. Mechanical efficiency
B. Volumetric efficiency
C. Hydraulic efficiency
D. Overall efficiency
Answer» D. Overall efficiency
Discussion
8.

IN_PELTON_TURBINE_HYDRAULIC_EFFICIENCY_IS_PRODUCT_OF_MECHANICAL_EFFICIENCY_AND_OVERALL_EFFICIENCY.?$

A. True
B. False
Answer» C.
Discussion
9.

In Pelton turbine inlet velocity of jet is 85.83m/s, inlet and outlet whirl velocities be 85.83 and 0.143 and blade velocity be 38.62 then its hydraulic efficiency is ___________$

A. 90.14%
B. 80%
C. 70%
D. 85%
Answer» B. 80%
Discussion
10.

The expression for hydraulic efficiency is given by$

A. 2(V1-u)[1+cos k]u/V1*V1
B. 2(V1+u)[1+cos k]u/V1*V1
C. 2(V1-u)[1-cos k]u/V1*V1
D. 2(V1+u)[1+cos k]u/V1*V1
Answer» B. 2(V1+u)[1+cos k]u/V1*V1
Discussion
11.

In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k” is known as ______?#

A. Specific density of liquid
B. Density of liquid
C. Specific gravity of liquid
D. Volume of liquid
Answer» C. Specific gravity of liquid
Discussion
12.

The expression for maximum hydraulic efficiency of Pelto turbine is given by _____________?

A. (1+cos k)/2 where k is outlet blade angle
B. (2+cos k)/2 where k is outlet blade angle
C. (3+cos k)/2 where k is outlet blade angle
D. (4+cos k)/2 where k is outlet blade angle
Answer» B. (2+cos k)/2 where k is outlet blade angle
Discussion
13.

In Pelton turbine the ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine is _______

A. Mechanical efficiency
B. Volumetric efficiency
C. Hydraulic efficiency
D. Overall efficiency
Answer» E.
Discussion
14.

In Pelton ____________ is ratio of volume of water actually striking the runner and volume of water supplied to turbine?

A. Mechanical efficiency
B. Volumetric efficiency
C. Hydraulic efficiency
D. Overall efficiency
Answer» C. Hydraulic efficiency
Discussion
15.

Among the following which turbine has least efficiency?

A. Pelton turbine
B. Kaplan turbine
C. Francis turbine
D. Propeller turbine
Answer» B. Kaplan turbine
Discussion
16.

In Pelton turbine product of mechanical efficiency and hydraulic efficiency is known as _____________

A. Mechanical efficiency
B. Volumetric efficiency
C. Hydraulic efficiency
D. Overall efficiency
Answer» E.
Discussion
17.

The maximum efficiency of Pelton turbine is _________

A. 80%
B. 70%
C. 50%
D. 88%
Answer» D. 88%
Discussion
18.

In Pelton turbine ___________ is defined as ratio between power delivered to runner and power supplied at inlet of turbine

A. Mechanical efficiency
B. Volumetric efficiency
C. Hydraulic efficiency
D. Overall efficiency
Answer» D. Overall efficiency
Discussion
19.

The hydraulic efficiency of Pelton turbine will be maximum when blade velocity is equal to _______

A. V/2
B. V/3
C. V/4
D. V/5
Answer» B. V/3
Discussion