Explore topic-wise MCQs in Hydraulic Machines.

This section includes 21 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.

The volume flow rate of water in 10 m3/s at an available head of 60 m (g = 10 m/s3). Find the shaft power (in MW) if the overall efficiency of the turbine is 90%.

A. 54
B. 5.4
C. 540
D. 0.54
Answer» C. 540
2.

The power output of the shaft is 5 MW. The volume flow rate of water in 10 m3/s at an available head of 60 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)?

A. 80
B. 82.5
C. 83.3
D. 85
Answer» D. 85
3.

The whirl velocity at inlet is 15 m/s and blade velocity is 10 m/s. The volume flow rate of water in 20 m3/s. Find the power output available at the shaft if the mechanical efficiency is 95% (in MW)?

A. 2.85
B. 3.075
C. 6.55
D. 0.285
Answer» B. 3.075
4.

The power available at the shaft of a Francis turbine is 1 MW. The volume flow rate of water in 25 m3/s, whirl velocity at inlet is 10 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)?

A. 65
B. 75
C. 80
D. 90
Answer» D. 90
5.

The volumetric efficiency of a given turbine is 80%. If volume flow rate of water in given to be 30 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second?

A. 5
B. 6
C. 10
D. 12
Answer» C. 10
6.

The volumetric efficiency of a Francis turbine is given to be 90%. If the volume flow rate through the turbine is 25 m3/s. What is the flow rate of water over the runner blades (in m3/s)?

A. 20
B. 25
C. 22.5
D. 21.5
Answer» D. 21.5
7.

THE_VOLUMETRIC_EFFICIENCY_OF_A_FRANCIS_TURBINE_IS_GIVEN_TO_BE_90%._IF_THE_VOLUME_FLOW_RATE_THROUGH_THE_TURBINE_IS_25_M3/S._WHAT_IS_THE_FLOW_RATE_OF_WATER_OVER_THE_RUNNER_BLADES_(IN_M3/S)??$

A. 20
B. 25
C. 22.5
D. 21.5
Answer» D. 21.5
8.

The power available at the shaft of a Francis turbine is 1 MW. The volume flow rate of water in 25 m3/s, whirl velocity at inlet is 10 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)?$

A. 65
B. 75
C. 80
D. 90
Answer» D. 90
9.

The_volumetric_efficiency_of_a_given_turbine_is_80%._If_volume_flow_rate_of_water_in_given_to_be_30_m3/s,_find_the_volume_of_water_(m3)_NOT_flowing_over_the_runner_blades_per_second?$

A. 5
B. 6
C. 10
D. 12
Answer» C. 10
10.

The hydraulic efficiency of a Francis turbine is 90%, the mechanical efficiency is 95% and the volumetric efficiency is assumed to be 100%. Fine the overall efficiency (in %)?

A. 80
B. 85.5
C. 87.5
D. 83.3
Answer» C. 87.5
11.

The volume flow rate of water in 10 m3/s at an available head of 60 m (g = 10 m/s3). Find the shaft power (in MW) if the overall efficiency of the turbine is 90%.

A. 54
B. 5.4
C. 540
D. 0.54
Answer» C. 540
12.

The power output of the shaft is 5 MW. The volume flow rate of water in 10 m3/s at an available head of 60 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)?

A. 80
B. 82.5
C. 83.3
D. 85
Answer» D. 85
13.

The_whirl_velocity_at_inlet_is_15_m/s_and_blade_velocity_is_10_m/s._The_volume_flow_rate_of_water_in_20_m3/s._Find_the_power_output_available_at_the_shaft_if_the_mechanical_efficiency_is_95%_(in_MW)?

A. 2.85
B. 3.075
C. 6.55
D. 0.285
Answer» B. 3.075
14.

The volume flow rate into a Francis turbine is Q m3/s. 0.25Q m3/s volume of water do not flow over the runner blades. What is the mechanical efficiency of the turbine (in %)?

A. 65
B. 75
C. 80
D. Mechanical efficiency cannot be found out from the given information
Answer» E.
15.

The input water power of the Francis turbine is 1.25 times the runner power. What would be the hydraulic efficiency of the turbine (in %)?

A. 60
B. 70
C. 80
D. 90
Answer» D. 90
16.

The desired hydraulic efficiency of a turbine is 80% at a whirl velocity of 20 m/s and a head of 100 m. What should be the blade velocity of the turbine at inlet in m/s?

A. 40
B. 60
C. 80
D. 25
Answer» B. 60
17.

The whirl velocity at inlet of Francis turbine is given to be 20 m/s. The blade velocity is given as 35 m/s. What is the hydraulic efficiency for a head of 100 m?

A. 80%
B. 90%
C. 70%
D. 98%
Answer» D. 98%
18.

Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft to the power supplied by water at the inlet?

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

Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner?

A. Hydraulic efficiency
B. Volumetric efficiency
C. Mechanical efficiency
D. Overall efficiency
Answer» D. Overall efficiency
20.

Which of the following efficiencies for Francis Turbine is described as the ratio between total quantity of water over runner blades to total quantity of water supplied to turbine?

A. Hydraulic efficiency
B. Volumetric efficiency
C. Mechanical efficiency
D. Overall efficiency
Answer» C. Mechanical efficiency
21.

Which of the following efficiencies for Francis Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet?

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