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Chapter:

420+ Turbine Solved MCQs

in Fluid Mechanics (FM)

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .

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Chapter: Turbine
351.

Specific speed develop a hydraulic flow through the centrifugal pumps.

A. True
B. False
C. none
D. none
Answer» A. True
discuss
352.

Net suction speed is used in problems with cavitation.

A. True
B. False
C. none
D. none
Answer» A. True
discuss
353.

The runner diameter in a turbine is denoted as                    

A. A
B. Dr
C. Rr
D. De
Answer» D. De
discuss
354.

Specific speed is the speed of the turbine which is similar to its                

A. Temperature difference
B. Pressure difference
C. Aspect ratio
D. Speed of rotor
Answer» C. Aspect ratio
discuss
355.

Specific speed develops a unit power under a unit               

A. Temperature
B. Pressure
C. Volume of the flow
D. Head
Answer» D. Head
discuss
356.

Impeller in a motor is used to                  

A. Change temperatures
B. Change Pressure
C. Kinetic energy change
D. Change density
Answer» B. Change Pressure
discuss
357.

Hydraulic head is also called as                  

A. Pressure head
B. Density head
C. Kinetic head
D. Piezometric head
Answer» D. Piezometric head
discuss
358.

Specific speed of a Pelton wheel with single jet is               

A. 8.5 to 30
B. 30 to 51
C. 51 to 225
D. 230 to 500
Answer» A. 8.5 to 30
discuss
359.

Specific speed is an index used to predict               

A. Head race distance
B. Tail race distance
C. Tank dimensions
D. Turbine performance
Answer» D. Turbine performance
discuss
360.

Specific speed of a Pelton wheel with multiple jets is               

A. 8.5 to 30
B. 30 to 51
C. 51 to 225
D. 230 to 500
Answer» B. 30 to 51
discuss
361.

Specific speed of a Francis turbine is               

A. 8.5 to 30
B. 30 to 51
C. 51 to 225
D. 230 to 500
Answer» C. 51 to 225
discuss
362.

Specific speed of a Kaplan turbine is               

A. 8.5 to 30
B. 30 to 51
C. 51 to 225
D. 355 to 860
Answer» D. 355 to 860
discuss
363.

Specific speed less than 500 are called                  

A. Positive displacement pumps
B. Negative displacement pumps
C. Draft tubes
D. Tanks
Answer» A. Positive displacement pumps
discuss
364.

With the increase in specific speeds,                

A. Head race distance increases
B. Tail race distance increases
C. Tank dimensions increases
D. Diameters of impeller increases
Answer» D. Diameters of impeller increases
discuss
365.

Specific speed is used to predict desired pump or turbine performance.

A. True
B. False
C. none
D. none
Answer» A. True
discuss
366.

Once we know the desired functions of the specific speed, it is easier to calculate its components units.

A. True
B. False
C. none
D. none
Answer» A. True
discuss
367.

Which among the following is not a unit quantity of turbine?

A. Unit speed
B. Unit discharge
C. Unit power
D. Unit temperature
Answer» D. Unit temperature
discuss
368.

What does DMU stand for?

A. Density matter usage
B. Direct material usage
C. Density material usage
D. Depth matter usage
Answer» B. Direct material usage
discuss
369.

Unit speed is the speed of the turbine operating under_              

A. One-meter head
B. Pressure head
C. Volumetric head
D. Draft tube
Answer» A. One-meter head
discuss
370.

One dyne is equal to N.

A. 10
B. 100
C. 1000
D. 10-5
Answer» D. 10-5
discuss
371.

What is symbol for unit speed?

A. S
B. N
C. Ns
D. Nu
Answer» D. Nu
discuss
372.

Unit speed of a single jet in a turbine is               

A. 100 m/s
B. 300 m/s
C. 500 m/s
D. 800 m/s
Answer» D. 800 m/s
discuss
373.

Unit speed is directly proportional to               

A. Head race distance
B. Specific speed
C. Pressure
D. Turbine performance
Answer» B. Specific speed
discuss
374.

Unit discharge is the discharge through the turbine when the head of the turbine is

A. High
B. Zero
C. Unity
D. Low
Answer» C. Unity
discuss
375.

9 Unit discharge is denoted as               

A. Du
B. Qu
C. Su
D. Nu
Answer» B. Qu
discuss
376.

Unit discharge is directly proportional to              

A. Head race distance
B. Discharge of fluid in the turbine.
C. Pressure
D. Turbine performance
Answer» B. Discharge of fluid in the turbine.
discuss
377.

Unit quantities are physical quantities                  

A. With numerical variables
B. Without numerical variables
C. With different sets
D. With unit difference
Answer» B. Without numerical variables
discuss
378.

Dyne cm is a Torque measurement unit.

A. True
B. False
C. none
D. none
Answer» A. True
discuss
379.

Unit quantities play an important role in determining the dimensional quantities.

A. True
B. False
C. none
D. none
Answer» A. True
discuss
380.

Unit power is developed by the turbine when the head of the turbine is unity.

A. True
B. False
C. none
D. none
Answer» A. True
discuss
381.

Constant head curves are also called as              

A. Head race curves
B. Tail race curves
C. Main characteristic curves
D. Impeller curves
Answer» C. Main characteristic curves
discuss
382.

The speed of the turbine in a constant head curve is varied by                    

A. Temperature change
B. Reaction speed change
C. Changing the gate opening
D. Wheel speed change
Answer» C. Changing the gate opening
discuss
383.

Constant speed curves travel at constant speed when the value is equal to               

A. 0
B. 1
C. 2
D. 3
Answer» B. 1
discuss
384.

Power of a turbine is measured             

A. Mechanically
B. Electrically
C. Chemically
D. Thermally
Answer» A. Mechanically
discuss
385.

Which among the following is not a parameter to determine the efficiency of the turbine?

A. Unit speed
B. Unit power
C. Unit volume
D. Unit discharge
Answer» C. Unit volume
discuss
386.

Which among the following is not an important parameter to determine the performance of the turbine?

A. Speed
B. Discharge
C. Head
D. Volume of tank
Answer» D. Volume of tank
discuss
387.

Which among the following is not a type of curve?

A. Logarithimic curve
B. Straight curve
C. Pressure vs power
D. Efficiency vs speed
Answer» C. Pressure vs power
discuss
388.

The inlet passage of water entry is controlled by                

A. Head race
B. Gate
C. Tail race
D. Pump
Answer» B. Gate
discuss
389.

Overall efficiency vs what is drawn to determine the turbine performance?

A. Unit Discharge
B. Unit speed
C. Unit power
D. Unit pressure
Answer» B. Unit speed
discuss
390.

Constant discharge takes place due to               

A. Unit Discharge
B. Unit speed
C. Unit power
D. Unit pressure
Answer» B. Unit speed
discuss
391.

All the characteristic curves are drawn with respect to                    

A. Unit Discharge
B. Unit speed
C. Unit power
D. Unit pressure
Answer» B. Unit speed
discuss
392.

In constant speed curves, the speed is kept a constant varying its head.

A. True
B. False
C. none
D. none
Answer» A. True
discuss
393.

In all the characteristic curves, the overall efficiency is aimed at the maximum value.

A. True
B. False
C. none
D. none
Answer» A. True
discuss
394.

Constant efficiency curves are plotted using               

A. Constant head curves
B. Constant speed curves
C. Main characteristic curves
D. Constant speed and constant head
Answer» D. Constant speed and constant head
discuss
395.

Constant speed curves are also called as               

A. Main characteristic curves
B. Turbine curves
C. Tail race curves
D. Impeller curves
Answer» C. Tail race curves
discuss
396.

Constant speed curve is denoted as           

A. T
B. V
C. c
D. V
Answer» C. c
discuss
397.

Constant speed curves are                

A. Scalar quantities
B. Vector quantities
C. Constant quantities
D. Different conditions
Answer» B. Vector quantities
discuss
398.

Constant speed is measured                  

A. Mechanically
B. Electrically
C. Chemically
D. Thermally
Answer» A. Mechanically
discuss
399.

Constant speed curves are determined by the                  

A. Arc length
B. Power
C. Heat
D. Temperature
Answer» C. Heat
discuss
400.

Which component is necessary for writing the velocity equation?

A. Cos component
B. Sine Component
C. Cos and sine component
D. Independent
Answer» C. Cos and sine component
discuss

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