Explore topic-wise MCQs in Hydraulic Machines.

This section includes 29 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.

Pelton wheel is a Reaction type water turbine.

A. True
B. False
Answer» C.
2.

The Pelton wheel extracts energy from________

A. Vane angle
B. Moving fluid
C. Increase in temperature
D. Heat rejection
Answer» C. Increase in temperature
3.

Before reaching the turbine, the acceleration of the fluid takes place through the__________

A. Vane angle
B. Nozzle
C. Pump
D. Pipe
Answer» C. Pump
4.

In an outward flow reaction turbine the discharge _______

A. Increases
B. Decreases
C. Same
D. Independent
Answer» B. Decreases
5.

In impulse turbines with stationary blades, there is_________ in blades of the turbine.

A. Pressure change
B. Same pressure
C. Volumetric change
D. Pressure independent
Answer» B. Same pressure
6.

In impulse turbines with moving blades, there is no _________ in blades of the turbine.

A. Pressure change
B. Same pressure
C. Volumetric change
D. Pressure independent
Answer» B. Same pressure
7.

A working fluid contains kinetic energy only.

A. True
B. False
Answer» C.
8.

In an inward flow reaction turbine the discharge _______

A. Increases
B. Decreases
C. Same
D. Independent
Answer» C. Same
9.

Where is the turbine not used?

A. Solar power
B. Windmill
C. Water wheels
D. Gas plant
Answer» B. Windmill
10.

Centrifugal flow is imparted when the__________

A. Reaction flow is negative
B. Reaction flow is positive
C. Efficiency is 100 percent
D. Reaction rate is negligible
Answer» D. Reaction rate is negligible
11.

Inward flow reaction turbine enter through ______

A. Outer periphery
B. Blades
C. Inner periphery
D. Pressure angle
Answer» B. Blades
12.

Turbine extracts energy from________

A. Reaction ratio
B. Pressure ratio
C. Fluid flow
D. Volumetric ratio
Answer» D. Volumetric ratio
13.

Turbine converts _________

A. Work to energy
B. Energy to work
C. Work to Electricity
D. Work to pressure
Answer» C. Work to Electricity
14.

A turbine is a ________

A. Rotary mechanical device
B. Static pressure drop device
C. Electrical device
D. Static temperature device
Answer» B. Static pressure drop device
15.

Degree of reaction for reaction turbine is _____________

A. 1- cot x /2(cot x –cot y)
B. 1+ cot x /2(cot x –cot y)
C. 1- cot x /2(cot x +cot y)
D. 1+ cot x /2(cot x +cot y)
Answer» B. 1+ cot x /2(cot x –cot y)
16.

The formula for degree of reaction for hydraulic turbines is __________

A. 1- (V1*V1-V2*V2)/(V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1)
B. (V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1)
C. 1+ (V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1)
D. 1- (V2*V2-V1*V1)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1)
Answer» B. (V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1)
17.

Degree of reaction for impulse turbine

A. 0
B. 1
C. 2
D. 3
Answer» B. 1
18.

___________is ratio of pressure energy change inside runner to total energy change inside runner

A. Degree of reaction
B. Speed ratio
C. Flow ratio
D. Hydraulic efficiency
Answer» B. Speed ratio
19.

An outward flow reaction turbine, ________

A. D1 > D2
B. D1 < D2
C. D1 = D2
D. D1 = D2 = 0
Answer» C. D1 = D2
20.

An outward radial reaction turbine has ______

A. u1 < u2
B. u1 > u2
C. u1 = u2
D. u2 = u1 = 0
Answer» B. u1 > u2
21.

Discharge in an outward flow reaction turbine ____________

A. Increases
B. Decreases
C. Remains constant
D. Gradually decreases
Answer» B. Decreases
22.

In an outward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity is ______

A. Speed ratio
B. Flow ratio
C. Discharge
D. Radial discharge
Answer» B. Flow ratio
23.

In an outward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as ___________

A. Speed ratio
B. Flow ratio
C. Discharge
D. Radial discharge
Answer» C. Discharge
24.

In outward radial flow reaction turbines, tangential velocity at inlet is less than that of the outlet.

A. False
B. True
Answer» C.
25.

___________ is a circular wheel on which a series of smooth, radial curved vanes are fixed.

A. Guide wheel
B. Runner
C. Casing
D. Draft tube
Answer» C. Casing
26.

In general, reaction turbines consist of which types of energies?

A. kinetic energy and potential energy
B. potential energy and pressure energy
C. kinetic energy and pressure energy
D. gravitational energy and potential energy
Answer» D. gravitational energy and potential energy
27.

If the water flows from inwards to outwards, the turbine is known as _____________

A. Tangential flow turbine
B. Turbulent low inward flow
C. Inward flow turbine
D. Outward flow turbine
Answer» E.
28.

The water from penstocks enters the _____ which is spiral in shape which the area of cross section of casing goes on decreasing gradually

A. guide wheel
B. draft tube
C. casing
D. runner
Answer» D. runner
29.

In an outward flow reaction turbine, water from casing enters guiding wheel.

A. True
B. False
Answer» B. False