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Free download in PDF Hydraulic Machines Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
According to fan laws, at constant pressure,the speed capacity and power vary......
[A]
Directly as the air or gas density
[B]
Inversely as square root of density
[C]
Inversely as density
[D]
As square of density
Answer: Inversely as square root of density
(22)
According to fan laws, at constant speed and capacity,the pressure and power very......
[A]
Directly as the air or gas density
[B]
Inversely as square root of density
[C]
Inversely as density
[D]
As square of density
Answer: Directly as the air or gas density
(23)
According to fan laws,for fans having constant wheel diameter, the power demand varies .........
[A]
Directly as a fan speed
[B]
Square of fan speed
[C]
Cube of fan speed
[D]
Square root of fans speed
Answer: Cube of fan speed
(24)
According to fan laws,for fans having constant wheel diameter, the air or gas capacity varies .......
[A]
directly as a fan speed
[B]
square of fan speed
[C]
cube of fan speed
[D]
square root of fans speed
Answer: directly as a fan speed
(25)
According to fan laws,for fans having constant wheel diameter, the pressure varies .......
[A]
Directly as a fan speed
[B]
Square of fan speed
[C]
Cube of fan speed
[D]
Square root of fans speed
Answer: Square of fan speed
(26)
Continuity equation deals with the law of conservation of .......
[A]
Mass
[B]
Momentum
[C]
Energy
[D]
None of the above
(27)
A stream line is a line ......
[A]
Which is along the path of a particle
[B]
Which is always parallel to the main direction of flow
[C]
Across which there is no flow
[D]
On which tangent drawn at any point gives the direction of velocity
Answer: Across which there is no flow
(28)
The flow in pipe is laminar if .........
[A]
Reynolds number is equal to 2500
[B]
Reynolds number is equal to 4000
[C]
Reynolds number is more than 2500
[D]
None of the above
Answer: None of the above
(29)
Bernoulli's theorem deals with the law of conservation of .......
[A]
Mass
[B]
Momentum
[C]
Energy
[D]
None of them
(30)
Pilot tube is used for measurement of .......
[A]
Pressure
[B]
Flow
[C]
Velocity at a point
[D]
Discharge
Answer: Velocity at a point
31
As specific speed of a centrifugal pump increases its blade height ......
[A]
Increases
[B]
Decreases
[C]
Remains unaffected
[D]
Increase or decrease depends on other factors
32
Higher specific speed (300 to 1000 ) of turbine indicates that the turbine is......
[A]
Pelton wheel
[B]
Kaplan
[C]
Francis
[D]
Any of the above
33
Higher specific speed (161 to 500 ) of centrifugal pump indicates that the pump is .........
[A]
Axial type
[B]
Mixed flow type
[C]
Axial flow
[D]
Any of the above
34
For Flood control and irrigation applications the pump generally used is.......
[A]
Centrifugal type
[B]
Ceciprocating type
[C]
Axial flow type
[D]
Radial flow type
35
Cavitation in hydraulic turbine results in .......
[A]
Noise and vibration
[B]
Reduction of discharge
[C]
Drop in output and efficiency
[D]
Rough surface
36
For small discharge and high heads which pump is preferred ......
[A]
Centrifugal type
[B]
Reciprocating type
[C]
Axial flow type
[D]
Radial flow type
Answer: Reciprocating type
37
Which of the following pumps is used for pumping viscous fluids......
[A]
Centrifugal pump
[B]
Screw pump
[C]
Reciprocating pump
[D]
Jet pump
38
Impellers for high heads usually have .........
[A]
High specific speed
[B]
Low specific speed
[C]
Medium specific speed
[D]
Variable specific speed
Answer: Low specific speed
39
Which of the following is not a rotary pump .......
[A]
Gear
[B]
Vane
[C]
Screw
[D]
Axial
40
Francis turbine is .......
[A]
Radial flow turbine
[B]
Axial flow turbine
[C]
Mixed flow turbine
[D]
Inward flow radial type turbine
Answer: Inward flow radial type turbine
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