# Multiple choice question for engineering

## Set 1

1. In a Kaplan turbine, what is the direction of water flow?

a) Axial and then axial

b) Radial and then axial

c) Tangential and then axial

d) Tangential and then radial

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2. For which of the following values of available heads may Kaplan turbine be used?

a) 250 m

b) 100 m

c) 80 m

d) 50 m

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3. In this type of low head turbine, the guide vanes are fixed to the hub of the turbine and are not adjustable. What is this type of turbine called?

a) Francis turbine

b) Kaplan Turbine

c) Propeller Turbine

d) Pelton turbine

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4. The velocity of flow through a Kaplan turbine is 10 m/s. The outer diameter of the runner is 4 m and the hub diameter is 2 m. Find the volume flow rate of the turbine in m3/s?

a) 95

b) 75

c) 85

d) 105

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^{3}/s.

5. The velocity of the flow at the inlet of Kaplan turbine is V. In an experimental setup, what could be the possible value of the velocity of the flow at the outlet of Kaplan turbine?

a) V

b) 0.8V

c) 1.2V

d) 2V

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6. Which of the following turbines will have the lowest number of blades in it?

a) Pelton turbine

b) Steam turbine

c) Francis turbine

d) Kaplan turbine

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7. The velocity of the flow through the Kaplan turbine is 25 m/s. The available head of the turbine is 60 m. Find the flow ratio of the turbine (take g = 10 m/s^{2}).

a) 0.65

b) 0.72

c) 0.69

d) 0.75

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_{f1}/ sqrt(2gH). The given of head and flow velocity must be substituted in this equation to obtain the flow ratio which comes out to be 0.72.

8. A Kaplan turbine requires a speed ratio of 2. The available head of the turbine is 5 m. What should be the blade velocity of the turbine such that a speed ratio of 2 is maintained (take g = 10 m/s^{2})?

a) 75.75 m/s

b) 63.25 m/s

c) 23.35 m/s

d) 50.00 m/s

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9. The flow ratio of a Kaplan turbine is given as 0.7. The available head is 30 m. The outer diameter of the runner is 3.5 m and the hub diameter is 2 m. Find the volume of water flowing through the turbine per second (m^{3}/s)?

a) 90

b) 111

c) 125

d) 168

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^{3}/s.

10. In which of the following type of runners in a Kaplan turbine the velocity of whirl at inlet is smaller than the blade velocity?

a) Such a case is practically impossible

b) Slow Runner

c) Medium Runner

d) Fast Runner

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11. In the outlet velocity triangle of a Kaplan turbine, β_{2} = 30^{o}. V_{f2} = 5 m/s. What is the relative velocity of the flow at outlet?

a) 10 m/s

b) 5.77 m/s

c) 8.66 m/s

d) 2.88 m/s

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_{2}) = V

_{f2}/ V

_{r2}. Therefore, V

_{r2}= 5/sin(30) = 10 m/s.

12. In the inlet velocity triangle of a Kaplan turbine, α1 = 45^{o}. The velocity of flow at inlet = 10 m/s. Find the whirl velocity of water at the inlet of Kaplan turbine?

a) 5 m/s

b) 10 m/s

c) 12.5 m/s

d) 15 m/s

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_{f1}/ V

_{w1o, Vf1 = Vw1 = 10 m/s.}

13. The whirl velocity of water at the inlet of the Kaplan turbine is 15 m/s. The velocity of water at inlet of the turbine is 20 m/s. Find the guide vane angle at inlet (In degrees).

a) 53.13

b) 36.86

c) 45

d) 41.41

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_{w1}/ V

_{1o.}

14. The relative velocity of water at the inlet of the Kaplan turbine is 7 m/s. β1 = 75^{o}. The whirl velocity of the water at inlet is 10 m/s. Find the blade velocity of the turbine?

a) 26.124 m/s

b) 40 m/s

c) 36.124 m/s

d) 60 m/s

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_{1}) = (u – V

_{w1})/ V

_{r1}. Substituting the given values in the above equation and rearranging to find the value of u, we get 36.124 m/s.

15.For the figure given below, find the missing terms in the order of (1), (2), (3) and (4).

a) V_{r1}, α_{1}, β_{1}, V_{w1}

b) V_{w1}, β_{1}, α_{1}, V_{r1}

c) V_{w1}, α1, β_{1}, V_{r1}

d) V_{r1}, β_{1}, α_{1}, V_{w1}

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_{w1}is along the direction of u. Hence (1) will be replaced by V

_{w1}. The angle between V1 and u is α

_{1}, Hence α1 replaces (2). (4) will then be replaced by V

_{r1}and (3) will be replaced by β

_{1}, since β

_{1}is the angle between V

_{r1}and u.

## Set 2

1. The characteristic curves of a centrifugal pump, plots ______ required by the pump.

a) Velocity

b) Pressure

c) NPSH

d) Velocity and pressure

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2. What is the shape of the diffuser in the centrifugal pump?

a) Round

b) Dough nut

c) Rectangle

d) Cylindrical

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3. When the casing in a centrifugal pump decelerates the flow, what increases?

a) Pressure

b) Temperature

c) Volume

d) Flow rate

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4. Which among the following is not a characteristic curve for centrifugal pump?

a) Transfer speed vs Transfer pressure

b) Head vs Flow rate

c) Power input vs pump efficiency

d) Specific speed vs pump efficiency

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5. The consequence of Newtons second law is _________

a) Conservation of angular momentum

b) Conservation of mass

c) Conservation of potential energy

d) Conservation of kinetic energy

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6. Which of the following is taken into account during a characteristic curve?

a) Flow rate

b) Cavitation

c) Tolerances

d) Casing

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7. The normal operating range of centrifugal pump is sufficient to plot the characteristic curve.

a) True

b) False

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8. The inlet passage of water entry is controlled by ________

a) Head race

b) Gate

c) Tail race

d) Pump

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9. As the specific speed increases, the slope of HQ curve _______

a) Decreases

b) Increases

c) Independent

d) Remains the same

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10. The primary selection tool is called as _______

a) Pump curve

b) Speed curve

c) Power curve

d) Fluid curve

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11. In case of centrifugal turbines with low specific speed, the efficiency curve is _________

a) Pointed

b) Small

c) Steep

d) Flat

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12. In case of centrifugal turbines with high specific speed, the efficiency curve is

a) Pointed

b) Small

c) Steep

d) Flat

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13. With the increase in the input power, efficiency _______

a) Increases

b) Decreases

c) Same

d) Independent

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14. What is unit of standard acceleration?

a) kg/m

b) kg/s

c) kg/m^{3}

d) N/m

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^{3}. It is denoted as g. It is also called as the acceleration due to gravity. Thus, the correct option is ‘c’.

## Set 3

1. A gear pump uses ___________

a) Petrochemical pumps

b) Meshing of gears

c) Froth pumps

d) Airlift pumps

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2. The fundamental significance of all the turbomachinery is _______

a) Conservation of momentum

b) Conservation of mass

c) Conservation of heat

d) Conservation of speed

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3. The most common pump used for hydraulic fluid power application is __________

a) Centrifugal pumps

b) Gear pump

c) Froth pumps

d) Airlift pumps

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4. The change of angular momentum in a pump is equal to the _________

a) Sum of speeds

b) Sum of individual momentum

c) Sum of temperatures

d) Sum of energy transferred from a body

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5. Conservation of angular momentum is described by _______

a) Newtons equation

b) Euler’s equation

c) Rutherford’s equation

d) Maxim equation

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6. Gear pumps are mainly used in chemical installations because they pump ________

a) High viscosity fluids

b) High density fluids

c) High pressure fluids

d) High temperature fluids

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7. Gear pumps convert rotational kinetic energy to hydrodynamic energy.

a) True

b) False

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8. The inlet passage of centrifugal pump is controlled by ________

a) Gate

b) Head race

c) Turbine

d) Pump

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9. Absolute exit velocity in a pump is denoted as ______

a) c2

b) v2

c) p2

d) w2

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10. Gear pumps are used to transport ________

a) Pressure

b) Speed

c) Power

d) Fluid

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11. Vertical Centrifugal pumps are also called as _________

a) Cantilever pumps

b) Hydrodynamic pump

c) Mechanical pump

d) Hydroelectric pump

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12. With the increase in load, Energy in the turbine________

a) Decreases

b) Increases

c) Remains same

d) Independent

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13. The rotational kinetic energy comes from ______

a) Engine motor

b) Pump

c) Tank

d) Draft tube

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14. When the balancing of the turbine is disturbed, we use ________

a) Throttle governing

b) Steam governing

c) Nozzle governing

d) Emergency governing

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15. Gear pumps are ___________

a) Tangential flow pumps

b) Positive displacement pumps

c) Negative displacement pumps

d) Radial pumps

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## Set 4

1. Radial flow reaction turbines are those turbines in which water flows ____________

a) Radial direction

b) Axial direction

c) Tangential direction

d) All of the mentioned

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2. Main parts of radial flow reaction turbines are ______________

a) Casing

b) Guide mechanism

c) Draft tube

d) All of the mentioned

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3. Discharge through radial flow reaction turbine is ______________

a) P1*b1*Vf1

b) P2*b2*Vf2

c) P1*b2*Vf2

d) Both P1*b1*Vf1 & P2*b2*Vf2

Where, P1= perimeter of runner at inlet, P2= perimeter of runner at outlet, b= thickness and Vf= flow velocity

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4. Radial flow reaction turbines contain spiral casing which area ____________

a) Remains constant

b) Gradually decreases

c) Gradually increases

d) Suddenly decreases

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5. ____________ consists of stationary circular wheel all around the runner of turbine

a) Casing

b) Guide mechanism

c) Runner

d) Drafting

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6. The casing of radial flow reaction turbine is made of spiral shape, so that water may enter the runner__________

a) Variable acceleration

b) Constant acceleration

c) Variable velocity

d) Constant velocity

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7. _____________ allow the water to strike the vanes fixed on runner without shock at inlet

a) Casing

b) Guide vanes

c) Runner

d) Draft tube

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8. Runner blades are made up of _____________

a) Cast steel

b) Cast iron

c) Wrought iron

d) Steel

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9. The pressure at the exit of runner of reaction turbine is generally____________than atmospheric pressure

a) Greater

b) Lesser

c) Constant

d) Equal

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10. ___________is a pipe of gradually increasing area used for discharging water from exit of the turbine to the tail race

a) Casing

b) Guide mechanism

c) Draft tube

d) Runner

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11. ____________and __________of radial flow reaction turbine are always full of water.

a) Casing and runner

b) Casing and penstocks

c) Runner and penstocks

d) Runner and draft tube

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12. ____________governs the flow of water entering the runner blades.

a) Casing

b) Guide vanes

c) Draft tube

d) Runner

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13. Spiral casing of reaction turbine will regulate the flow?

a) True

b) False

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## Set 5

1. The fluid gains _________ while passing through the impeller.

a) Velocity

b) Pressure

c) Temperature

d) Velocity and pressure

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2. What is the shape of the diffuser in the centrifugal pump?

a) Round

b) Dough nut

c) Rectangle

d) Cylindrical

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3. When the casing in a centrifugal pump decelerates the flow, what increases?

a) Pressure

b) Temperature

c) Volume

d) Flow rate

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4. The velocity imparted by the impeller is converted into _________

a) Pressure energy

b) Kinetic energy

c) Momentum

d) Potential energy

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5. The consequence of Newtons second law is_________

a) Conservation of angular momentum

b) Conservation of mass

c) Conservation of potential energy

d) Conservation of kinetic energy

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6. Change of angular momentum is equal to ________

a) Sum of external moments

b) Sum of their potential energies

c) Sum of their kinetic energies

d) Sum of their pressures

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7. Euler developed the head pressure equation in centrifugal pumps.

a) True

b) False

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8. What is a major advantage of centrifugal pump?

a) Cost

b) Simple in construction

c) Efficiency

d) Pump parameters

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9. ‘Ht’ means _______

a) Tangential head

b) Horizontally head

c) Theory head pressure

d) Radially head pressure

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10. Centrifugal pumps are used to transport ________

a) Pressure

b) Speed

c) Power

d) Fluid

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11. Different velocities in a centrifugal pump are determined by using ________

a) Velocity triangle

b) Reynolds number

c) Froude number

d) Overall efficiency

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12. Due to its impeller action, centrifugal pumps can cover a wide range of fluid pump applications.

a) True

b) False

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13. With the increase in the input power, efficiency _______

a) Increases

b) Decreases

c) Same

d) Independent

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14. What is unit of standard acceleration?

a) kg/m

b) kg/s

c) kg/m^{3}

d) N/m

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^{3}. It is denoted as g. It is also called as the acceleration due to gravity.

15. What does PSP stand for?

a) Pump start procedure

b) Positive start pump

c) Pump start pointer

d) Positive start pointer