Explore topic-wise MCQs in Hydraulic Machines.

This section includes 7 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