Explore topic-wise MCQs in Hydraulic Machines.

This section includes 31 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.

Flow ratio is defined as Vf1/(2gH)1/2

A. False
B. True
Answer» C.
Discussion
2.

The speed ratio is defined as u/(2gH)1/2

A. True
B. False
Answer» B. False
Discussion
3.

Which among the following velocities cannot be found using the velocity triangle?

A. Tangential
B. Whirl
C. Relative
D. Parabolic
Answer» E.
Discussion
4.

The velocities of the blade angles can be found out using________

A. Mach number
B. Froude’s number
C. Velocity triangles
D. Reynolds number
Answer» D. Reynolds number
Discussion
5.

Non- inertial cavitation is the one in which a bubble of fluid is forced to oscillate.

A. True
B. False
Answer» B. False
Discussion
6.

In case of gas turbines and compressors, degree of reaction is ________

A. Static pressure drop in rotor/ static pressure drop in stage
B. Static pressure drop in stage/ static pressure drop in rotor
C. Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage
D. Static temperature drop in stage/ static temperature drop in rotor
Answer» D. Static temperature drop in stage/ static temperature drop in rotor
Discussion
7.

NON-_INERTIAL_CAVITATION_IS_THE_ONE_IN_WHICH_A_BUBBLE_OF_FLUID_IS_FORCED_TO_OSCILLATE.?$

A. True
B. False
Answer» B. False
Discussion
8.

The velocities of the blade angles can be found out using________$

A. Mach number
B. Froude’s number
C. Velocity triangles
D. Reynolds number
Answer» D. Reynolds number
Discussion
9.

In a Francis turbine, degree of reaction lies between _____

A. 0 and 1
B. 1 and 2
C. 0 and 0.5
D. 0.5 and 0.1
Answer» B. 1 and 2
Discussion
10.

_________ means the angle made by absolute velocity with the tangent on the wheel is 90 degrees and the component of whirl velocity is zero.

A. Axial discharge
B. Tangential discharge
C. Turbulent discharge
D. Radial discharge
Answer» E.
Discussion
11.

Flow ratio is defined as Vf1/(2gH)1/2

A. False
B. True
Answer» C.
Discussion
12.

The speed ratio is defined as u/(2gH)1/2

A. True
B. False
Answer» B. False
Discussion
13.

When the thicknesses of vanes are to be considered in the discharge of a turbine, what will be the area under consideration?

A. Pi*d – n*t
B. Pi*d – n*n*t
C. Pi*d – t*t
D. Pi*d *d– n*t
Answer» B. Pi*d ‚Äö√Ñ√∂‚àö√ë‚àö¬® n*n*t
Discussion
14.

Discharge through a reaction flow reaction turbine is given by, Q = ______

A. Pi*d*b*Vf1
B. Pi*d*d*b*Vf1
C. Pi*d*b*b*Vf2
D. Pi*b*b*Vf1
Answer» B. Pi*d*d*b*Vf1
Discussion
15.

For an actual reaction turbine, what should be the angle beta, such that the loss of kinetic energy at the outlet is to be minimum?

A. 90
B. 45
C. 60
D. 30
Answer» B. 45
Discussion
16.

When a container containing a liquid is rotated, then due to centrifugal action, then which of these energies are changed?

A. Kinetic energy
B. Pressure energy
C. Potential energy
D. Energy due to viscous force
Answer» C. Potential energy
Discussion
17.

Which of these ratios are termed to be hydraulic efficiency?

A. Water power to delivered power
B. Delivered power to input power
C. Power lost to power delivered
D. Runner power to water power
Answer» E.
Discussion
18.

Which of these options are best suited for the total energy change inside the runner per unit weight?

A. Degree of action
B. Degree of reaction
C. Turbulence
D. Efficiency of turbine
Answer» C. Turbulence
Discussion
19.

Degree of reaction turbine is the ratio of?

A. Pressure energy to total energy
B. Kinetic energy to total energy
C. Potential energy to total energy
D. Kinetic energy to potential energy
Answer» B. Kinetic energy to total energy
Discussion
20.

Super cavitation is the use of cavitation effect to create a bubble of steam inside a liquid.

A. True
B. False
Answer» B. False
Discussion
21.

The process of bubble generation leads to __________

A. High temperatures
B. High pressures
C. High energy densities
D. High volumetric ratio
Answer» D. High volumetric ratio
Discussion
22.

Hydrodynamic cavitation is due to the process of _________

A. Vaporisation
B. Sedimentation
C. Filtration
D. Excavation
Answer» B. Sedimentation
Discussion
23.

Which_among_the_following_velocities_cannot_be_found_using_the_velocity_triangle?

A. Tangential
B. Whirl
C. Relative
D. Parabolic
Answer» E.
Discussion
24.

In case of gas turbines and compressors, degree of reaction is _______?

A. Static pressure drop in rotor/ static pressure drop in stage
B. Static pressure drop in stage/ static pressure drop in rotor
C. Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage
D. Static temperature drop in stage/ static temperature drop in rotor
Answer» D. Static temperature drop in stage/ static temperature drop in rotor
Discussion
25.

Voids that implode near metal surface develops a_______

A. Drag force
B. Cyclic stress
C. Shock waves
D. Flow speed
Answer» C. Shock waves
Discussion
26.

At high pressure, the voids can generate ______

A. Drag force
B. Mass density
C. Shock waves
D. Flow speed
Answer» D. Flow speed
Discussion
27.

Degree of reactions are most commonly used in________

A. Turbomachinery
B. Pressure drag
C. Aerodynamics
D. Automobiles
Answer» B. Pressure drag
Discussion
28.

Cavitation usually occurs due to the changes in ________

A. Pressure
B. Temperature
C. Volume
D. Heat
Answer» B. Temperature
Discussion
29.

Voids are created due to______

A. Reaction ratio
B. Pressure ratio
C. Liquid free layers
D. Volumetric layers
Answer» D. Volumetric layers
Discussion
30.

What is the degree of reaction denoted as?

A. D
B. R
C. r
D. d
Answer» C. r
Discussion
31.

The formation of vapour cavities is called _____

A. Static pressure drop
B. Cavitation
C. Isentropic expansion
D. Emulsion
Answer» C. Isentropic expansion
Discussion