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Multiple choice question for engineering

Set 1

1. A pump that has low suction and moderate discharge is called _______
a) Froth pumps
b) Air lift pumps
c) Reciprocating pumps
d) Centrifugal pumps

View Answer

Answer: b [Reason:] A pump that has low suction and moderate discharge is called air lift pumps. These pumps have a moderate discharge with liquid and entrained solids.

2. Turbomachines work under ________
a) Newtons first law
b) Newtons second law
c) Newtons third law
d) Kepler’s law

View Answer

Answer: b [Reason:] Turbomachines work under Newtons second law. Centrifugal pump is a turbomachinery. Turbomachines are machines that transfer energy between a rotor and a fluid, including both turbines and compressors. It is a mechanical device.

3. The main function of nozzle is to __________
a) Varying temperatures
b) Pressure variations
c) Load variations
d) Heat variations

View Answer

Answer: b [Reason:] The main function of nozzle is to vary the pressure of fluid passing through the nozzle. It is done by opening and shutting the sets of nozzles. Thus, its main function is to regulate pressure of the fluid.

4. The main function of centrifugal pumps are to ________
a) Transfer speed
b) Transfer pressure
c) Transfer temperature
d) Transfer energy

View Answer

Answer: d [Reason:] The primary objective of a centrifugal pump is to transfer energy. Centrifugal pump is a turbomachinery. Turbomachines are machines that transfer energy between a rotor and a fluid, including both turbines and compressors. It is a mechanical device.

5. The pump injects compressed air at the _________
a) Rotor pipe
b) Bottom of the discharge pipe
c) Top of the discharge pipe
d) Rotor to draft

View Answer

Answer: b [Reason:] An airlift pump injects the compressed air at the bottom of the discharge pipe. A pump that has low suction and moderate discharge is called air lift pumps. These pumps have a moderate discharge with liquid and entrained solids.

6. Which among the following control the flow rate?
a) Valve
b) Pump
c) Head
d) Tank pipe

View Answer

Answer: a [Reason:] Flow rate of the tank is controlled by the valve. The actuation of individual valve closes. This corresponds to the set of nozzle thereby controlling the actual flow rate of the fluid passing through the valve.

7. The compressed air mixes with the liquid casing to become less dense.
a) True
b) False

View Answer

Answer: a [Reason:] The compressed air mixes with the liquid casing to become less denser that the rest of the liquid. This is because it will get displaced upwards through the discharge pipe.

8. The inlet passage of water entry is controlled by ________
a) Head race
b) Gate
c) Tail race
d) Pump

View Answer

Answer: b [Reason:] The inlet passage of water entry is controlled by the gate opening. The gate opening is an opening that sends only a percentage of fluid through the inlet passages for water to enter to the turbine.

9. Airlift pumps are widely used in aquaculture to pump.
a) True
b) False

View Answer

Answer: a [Reason:] The statement is true. Airlift pumps are widely used in aquaculture to pump. It also circulates and aerates the water in a closed environment. This helps it to recirculate in system and ponds.

10. Centrifugal pumps are used to transport ________
a) Pressure
b) Speed
c) Power
d) Fluid

View Answer

Answer: d [Reason:] Centrifugal pumps are used to transport fluids. They transport fluids by conversion of energies. Centrifugal pumps are a sub class of dynamic axisymmetric work absorbing turbomachinery.

11. The air lift pump works under the principle of _______
a) Newtons equation
b) Buoyancy
c) Momentum conservation
d) Hydrodynamic energy

View Answer

Answer: b [Reason:] The air lift pump works under the principle of buoyancy force that helps the compressed air to get injected into the lower part of the pipe that transports the liquid.

12. With the increase in load, Energy in the turbine________
a) Decreases
b) Increases
c) Remains same
d) Independent

View Answer

Answer: a [Reason:] When there is an increase in the load, the energy in the turbine is drained off. Thus, to increase the energy, the by pass valve is opened to increase the amount of fresh steam entry. This increases the energy in the turbine.

13. The rotational kinetic energy comes from ______
a) Engine motor
b) Pump
c) Tank
d) Draft tube

View Answer

Answer: a [Reason:] Centrifugal pumps transport fluids by converting rotational Kinetic energy to hydrodynamic energy. The rotational kinetic energy comes from engine or electrical motor.

14. When the balancing of the turbine is disturbed, we use ________
a) Throttle governing
b) Steam governing
c) Nozzle governing
d) Emergency governing

View Answer

Answer: d [Reason:] When the balancing of the turbine is disturbed, we use emergency governing. These governors come into action only when there are emergencies in the turbine.

15. The fluid coming into the airlift pump is accelerated by ________
a) Throttle
b) Impeller
c) Nozzle
d) Governor

View Answer

Answer: b [Reason:] The fluid coming into the airlift pump is accelerated by an impeller. The fluid enters the pump along a radially outward direction into the diffuser or a volute chamber.

Set 2

1. A pressure vessel is used to hold _______
a) Air
b) Gases
c) Molecules
d) Solids

View Answer

Answer: b [Reason:] The pressure vessels in most turbomachinery are used to hold liquid and gasses at a pressure that is different from an ambient pressure.

2. Why do we need a maximum safe operating pressure?
a) Pressure vessel might explode
b) Temperature increase needs to be controlled
c) Heat transfer is rejected
d) Improve overall efficiency

View Answer

Answer: a [Reason:] Pressure vessels need to be operated under low conditions as they might explode due to increase in pressure. The pressure vessels in most turbomachinery are used to hold liquid and gasses at a pressure that is different from an ambient pressure.

3. When is a reciprocating pump used?
a) When quantity of liquid is small
b) When quantity of liquid is large
c) To pump high pressure
d) To pump low pressure

View Answer

Answer: a [Reason:] Reciprocating pump is used when the quantity of liquid is small. Because handling such small quantity liquids is difficult. Especially when the delivery pressure is quite large.

4. The maximum efficiency of the reciprocating pump is _________
a) 20
b) 50
c) 70
d) 85

View Answer

Answer: d [Reason:] Reciprocating pump is more favourable for small liquid quantities. As the chamber in the liquid is trapped, it has a stationary cylinder which contains a piston and a plunger. The maximum efficiency of the reciprocating pump is 85 percent.

5. A tank that is used to protect closed water heating systems is called ________
a) Pressure vessel
b) Expansion vessel
c) Heat vessel
d) Auto vessel

View Answer

Answer: b [Reason:] A tank that is used to protect closed water heating systems is called expansion vessel. It is essential for heating process of water.

6. How is the construction of the vessel tested?
a) Uniform testing
b) Continuous testing
c) Pulsating test
d) Non-destructive testing

View Answer

Answer: d [Reason:] Pressure vessels are tested using non-destructive testing also called the NDT. It is a very essential method to determine the defects in the turbomachinery.

7. What does BPVC stand for?
a) Boiler and pressure vessel code
b) Boiler and pump vessel code
c) Boiler and pressure vessel clutch
d) Boiler and pump vessel clutch

View Answer

Answer: a [Reason:] BPVC stands for Boiler and pressure vessel code. It is a standard code for determining the pressure that the pressure vessels can withstand.

8. Which of the following is not an NDT type?
a) Ultrasonic
b) Liquid penetrant
c) Visual
d) Hammer test

View Answer

Answer: d [Reason:] Hammer test is not a non destructive type of testing. Some of the examples of destructive testing are ultrasonic, radiography, liquid penetrant and visual testing.

9. What is the full form of NDI?
a) Non-destructive intern
b) Non-destructive inspection
c) Non-destructive inkling
d) Non-destructive inertia

View Answer

Answer: b [Reason:] The full form of NDI is Non-destructive inspection. It is a very essential method to determine the defects in the turbomachinery.

10. NDT is a money and time saving technique.
a) True
b) False

View Answer

Answer: a [Reason:] NDT is a money and time saving technique because it does not permanently alter the article that is being inspected. It does evaluation, trouble shooting and research work.

11. Where is the excess quantity of water from the pump accumulated?
a) Froth tube
b) Draft tube
c) Air vessels
d) Bicycle pump

View Answer

Answer: c [Reason:] The excess quantity of water is accumulated in air vessels. Air vessels help to maintain high temperature and pressure of fluid.

12. NDT relies upon _________
a) Electromagnetic radiation
b) Heat
c) Pressure change
d) Temperature

View Answer

Answer: a [Reason:] NDT relies upon sound and electromagnetic radiation. NDT is a money and time saving technique because it does not permanently alter the article that is being inspected. It does evaluation, trouble shooting and research work.

13. What is the shape of a pressure vessel?
a) Square
b) Spheres
c) Cones
d) All the shapes

View Answer

Answer: d [Reason:] Pressure vessel can be made of any shape. It is most commonly made up in spheres, cones , cylinders and cut into different sections with different cross sections.

14. Safety valve is used to ensure that the pressure in the vessels is not exceeded.
a) True
b) False

View Answer

Answer: a [Reason:] Safety valve is used to ensure that the pressure in the vessels is not exceeded. Safety valve is also called as the relief valve. It has an intricate design to serve this purpose.

15. Pressure vessel closures are used to _________
a) Avoid breakage
b) Avoid leakage
c) Retain structures
d) Maintain pressure

View Answer

Answer: c [Reason:] Pressure vessel closures are used for retaining structures. It is designed in such a way to provide quick access to pressure vessels, pipelines and filtration systems.

Set 3

1. Vertical centrifugal pumps are also called as ________
a) Froth pumps
b) Multistage pumps
c) Cantilever pumps
d) Magnetic pumps

View Answer

Answer: c [Reason:] Vertical centrifugal pumps are also called as cantilever pumps. They utilize a unique shaft and bearing support for configuration. Thus, it is called as cantilever pumps.

2. Vertical pump uses _______
a) Draft tube
b) Throttle bush
c) Stuffing box
d) Interlining

View Answer

Answer: b [Reason:] Vertical pumps use throttle bush. They do not use stuffing box. Vertical centrifugal pumps are also called as cantilever pumps. They utilize a unique shaft and bearing support for configuration. Thus, it is called as cantilever pumps.

3. When the casing in a centrifugal pump decelerates the flow, what increases?
a) Pressure
b) Temperature
c) Volume
d) Flow rate

View Answer

Answer: a [Reason:] When the casing in a centrifugal pump decelerates the flow, pressure in the turbine increases. The diffuser helps this happen. The shape of the diffuser passing present in the centrifugal pump is doughnut shaped.

4. The maximum volumetric efficiency of a pump(100cc) is ________
a) 60%
b) 70%
c) 80%
d) 90%

View Answer

Answer: d [Reason:] The primary objective of a centrifugal pump is to transfer energy. Centrifugal pump is a turbomachinery. Turbomachines are machines that transfer energy between a rotor and a fluid, including both turbines and compressors. It is a mechanical device.

5. The most common application of vertical centrifugal pump is used in _______
a) Parts washer
b) Mineral industry
c) Paper plating
d) Jukebox

View Answer

Answer: a [Reason:] The most application of the vertical centrifugal pump is used in parts washer. Vertical pumps use throttle bush. They do not use stuffing box. Vertical centrifugal pumps are also called as cantilever pumps.

6. What does BEP stand for?
a) Best efficiency point
b) Brake ejection point
c) Break effect point
d) Best effect point

View Answer

Answer: a [Reason:] BEP stands for Best efficient point. It is a point at which Shut off and Run out point. It helps to identify the pumps performance.

7. The height of a column in a pump is called as _______
a) Vertical head
b) Horizontal head
c) Static head
d) Multi head

View Answer

Answer: c [Reason:] In a centrifugal pump, the height of the column is called as a static head. Static head corresponds to the pressure depending on the weight.

8. The centrifugal pump has varying flow depending on the _________
a) Pressure
b) Static lift
c) Volume
d) Flow rate

View Answer

Answer: a [Reason:] Due to pressure variations there are changes that take place in the centrifugal pump. Thus, the flow keeps varying.

9. What is purpose of froth in froth pumps?
a) Separates rich minerals
b) Mixes rich minerals
c) Removes ores
d) Detects oil

View Answer

Answer: a [Reason:] The main function of the froth in froth pumps is to separate rich minerals. It is also used to separate bitumen from the sand and the clays.

10. Froth contains air that blocks the pumps.
a) True
b) False

View Answer

Answer: a [Reason:] Froth contains air that blocks the pumps. The main function of the froth in froth pumps is to separate rich minerals. It is also used to separate bitumen from the sand and the clays.

11. When froth blocks the pump, it leads to _______
a) Separation of rich minerals
b) Mixing of rich minerals
c) Removing of ores
d) Loss of prime

View Answer

Answer: d [Reason:] When froth blocks the pump, it leads to loss of prime. The main function of the froth in froth pumps is to separate rich minerals. It is also used to separate bitumen from the sand and the clays.

12. What affects volumetric efficiency of the pump?
a) Complex interactions
b) Internal interactions
c) Retain flow
d) Air flow

View Answer

Answer: a [Reason:] The volumetric efficiency of the centrifugal is affected due to complex interactions. Thus, some engines use two intake manifolds.

13. The Positive Displacement Pump has more or less a constant flow regardless of the system pressure or head.
a) True
b) False

View Answer

Answer: a [Reason:] The Positive Displacement Pump has more or less a constant flow regardless of the system pressure or head.

14. What is the purpose of inducer in a froth pump?
a) It recirculates air
b) The pressurizes the air
c) Froths are generated
d) It breaks the bubbles

View Answer

Answer: d [Reason:] The purpose of the inducer in a froth pump is to break the bubbles. The main function of the froth in froth pumps is to separate rich minerals. It is also used to separate bitumen from the sand and the clays.

Set 4

1. In hydraulic head, NPSH is used for the analysis of __________
a) Adiabatic expansion
b) Priming
c) Wear
d) Cavitation

View Answer

Answer: d [Reason:] In hydraulic head, net positive circuit is used for the analysis of cavitation. It determines the cavitation present in the centrifugal pump by different methods.

2. NPSH is the difference between _______
a) Suction pressure and vapour pressure
b) Vapour pressure and suction pressure
c) Suction pressure and heat
d) Shaft and head

View Answer

Answer: a [Reason:] NPSH is defined as the difference suction pressure and vapour pressure. It is called as the net positive suction head.

3. What can NPSH be used to determine _______
a) Friction characteristics
b) Pipe diameter
c) Cavitation
d) Thermal expansion

View Answer

Answer: c [Reason:] NPSH is used to determine the cavitation in pumps. NPSH is defined as the difference suction pressure and vapour pressure. It is called as the net positive suction head.

4. The measure of how close the fluid is to the given point is called _________
a) Flashing
b) Darcy’s factor
c) Transfer temperature
d) Heizenberg’s factor

View Answer

Answer: a [Reason:] The measure of how close the fluid is to the given point is called flashing. It is one of the major methods in the NPSH to determine the cavitation.

5. What is the dimension for Darcy’s friction factor?
a) kg/m
b) N/mm
c) kg
d) Dimensionless

View Answer

Answer: d [Reason:] Darcy’s friction factor is dimensionless. It is one of the major applications in Fluid dynamics. The energy usage in pumping installation is determined by Friction characteristics. Thus, it is dimensionless.

6. NPSH is relevant ________
a) Outside the pumps
b) Inside the pumps
c) Away from the pumps
d) Series and parallel with the pumps

View Answer

Answer: a [Reason:] NPSH is relevant inside the pumps. hydraulic head, net positive circuit is used for the analysis of cavitation. It determines the cavitation present in the centrifugal pump by different methods.

7. With the increase in cavitation, the drag coefficient of the impeller ______
a) Increases
b) Decreases
c) Same
d) Independent

View Answer

Answer: a [Reason:] With the increase in cavitation, the drag coefficient of the impeller increases. When the flow output is higher, impellers are connected in parallel. The impeller is mounted on one shaft or different shaft.

8. What is the full form of NPSH in a pump?
a) Net pressure suction head
b) Net positive suction head
c) Non-pressure suction head
d) Net pressure super head

View Answer

Answer: b [Reason:] The full form of NPSH is Net positive suction head. The head added by the pump is a sum of static lift. Thus, corresponds to the efficient working of the pump. Higher the NPSH, more efficient the pump is.

9. When the NPSH is low, it leads to ________
a) Breaking
b) Wear
c) Corrosion
d) Cavitation

View Answer

Answer: d [Reason:] When the NPSH is low, it leads to cavitation. Cavitation is one of the major drawbacks that are seen in a centrifugal pump. There are various other problems as well. But, cavitation is due to low NPSH.

10. What is positive suction head?
a) Draft tube is above
b) Pump pressure is above
c) Liquid level is above
d) Turbine head is above

View Answer

Answer: c [Reason:] Positive suction head is defined as the point in which the liquid level is above the centre line of the pump.

11. NPSHr is determined by using ______
a) Pump pressure
b) PumpLinx
c) Heat transfer
d) Chemical energy

View Answer

Answer: b [Reason:] NPSHr of a pump can be determined by using Pumplinx. The full form of NPSH is Net positive suction head. The head added by the pump is a sum of static lift.

12. Corrosion in the pump is developed due to _______
a) Pressure of air
b) Fluid properties
c) Draft tube
d) Tank dimensions

View Answer

Answer: b [Reason:] Corrosion in the pump is developed due to fluid properties. The flow of fluid plays a major role in determining the corrosion developed. Fluid flow can broadly be classified into laminar and turbulent depending on its Reynolds number.

13. Calculation of NPSH in a turbine is different from the calculation of NPSH in a pump.
a) True
b) False

View Answer

Answer: a [Reason:] Calculation of NPSH in a turbine is different from the calculation of NPSH in a pump. It is mainly because the point at which the cavitation will first occur is in a different place.

14. If we use two lower capacity pumps in parallel, cavitation ________
a) Increases
b) Decreases
c) Same
d) Independent

View Answer

Answer: b [Reason:] If we use two lower capacity pumps in parallel, cavitation decreases. It happens when the NPSh value is bought in its safety limit.

15. Vapour pressure is strongly dependent on temperature in a pump.
a) True
b) False

View Answer

Answer: a [Reason:] Yes, Vapour pressure is strongly dependent on temperature in a pump. It will thus increase the net positive suction head of the centrifugal pump.

Set 5

1. Centrifugal pump is a_________
a) Turbomachinery
b) Flow regulating device
c) Drafting device
d) Intercooling device

View Answer

Answer: a [Reason:] Centrifugal pump is a turbomachinery. Turbomachines are machines that transfer energy between a rotor and a fluid, including both turbines and compressors. It is a mechanical device.

2. Turbomachines work under ________
a) Newtons first law
b) Newtons second law
c) Newtons third law
d) Kepler’s law

View Answer

Answer: b [Reason:] Turbomachines work under Newtons second law. Centrifugal pump is a turbomachinery. Turbomachines are machines that transfer energy between a rotor and a fluid, including both turbines and compressors. It is a mechanical device.

3. The main function of nozzle is to __________
a) Varying temperatures
b) Pressure variations
c) Load variations
d) Heat variations

View Answer

Answer: b [Reason:] The main function of nozzle is to vary the pressure of fluid passing through the nozzle. It is done by opening and shutting the sets of nozzles. Thus, its main function is to regulate pressure of the fluid.

4. The main function of centrifugal pumps are to ________
a) Transfer speed
b) Transfer pressure
c) Transfer temperature
d) Transfer energy

View Answer

Answer: d [Reason:] The primary objective of a centrifugal pump is to transfer energy. Centrifugal pump is a turbomachinery. Turbomachines are machines that transfer energy between a rotor and a fluid, including both turbines and compressors. It is a mechanical device.

5. Centrifugal pumps transfer energy from _______
a) Rotor to fluid
b) Fluid to rotor
c) Draft to rotor
d) Rotor to draft

View Answer

Answer: a [Reason:] Centrifugal pumps transfer energy from rotor to fluid. The primary objective of a centrifugal pump is to transfer energy. Centrifugal pump is a turbomachinery.

6. Which among the following control the flow rate?
a) Valve
b) Pump
c) Head
d) Tank pipe

View Answer

Answer: a [Reason:] Flow rate of the tank is controlled by the valve. The actuation of individual valve closes. This corresponds to the set of nozzle thereby controlling the actual flow rate of the fluid passing through the valve.

7. Turbines and compressors work with the gas, while centrifugal pump transfers energy.
a) True
b) False

View Answer

Answer: a [Reason:] Turbines and compressors work with the gas, while centrifugal pump transfers energy. Centrifugal pumps transfer energy from rotor to fluid. The primary objective of a centrifugal pump is to transfer energy. Centrifugal pump is a turbomachinery.

8. The inlet passage of water entry is controlled by ________
a) Head race
b) Gate
c) Tail race
d) Pump

View Answer

Answer: b [Reason:] The inlet passage of water entry is controlled by the gate opening. The gate opening is an opening that sends only a percentage of fluid through the inlet passages for water to enter to the turbine.

9. Centrifugal pumps are a sub class of dynamic axisymmetric work absorbing turbomachinery.
a) True
b) False

View Answer

Answer: a [Reason:] The statement is true. Centrifugal pumps are a sub class of dynamic axisymmetric work absorbing turbomachinery. The main function of centrifugal pumps are to transfer energy.

10. Centrifugal pumps are used to transport ________
a) Pressure
b) Speed
c) Power
d) Fluid

View Answer

Answer: d [Reason:] Centrifugal pumps are used to transport fluids. They transport fluids by conversion of energies. Centrifugal pumps are a sub class of dynamic axisymmetric work absorbing turbomachinery.

11. Centrifugal pumps transport fluids by converting _________
a) Kinetic energy to hydrodynamic energy
b) Hydrodynamic energy to kinetic energy
c) Mechanical energy to kinetic energy
d) Mechanical energy to Hydrodynamic energy

View Answer

Answer: a [Reason:] Centrifugal pumps are used to transport fluids. They transport fluids by conversion of energies. Centrifugal pumps transport fluids by converting rotational Kinetic energy to hydrodynamic energy.

12. With the increase in load, Energy in the turbine________
a) Decreases
b) Increases
c) Remains same
d) Independent

View Answer

Answer: a [Reason:] When there is an increase in the load, the energy in the turbine is drained off. Thus, to increase the energy, the by pass valve is opened to increase the amount of fresh steam entry. This increases the energy in the turbine.

13. The rotational kinetic energy comes from ______
a) Engine motor
b) Pump
c) Tank
d) Draft tube

View Answer

Answer: a [Reason:] Centrifugal pumps transport fluids by converting rotational Kinetic energy to hydrodynamic energy. The rotational kinetic energy comes from engine or electrical motor.

14. When the balancing of the turbine is disturbed, we use ________
a) Throttle governing
b) Steam governing
c) Nozzle governing
d) Emergency governing

View Answer

Answer: d [Reason:] When the balancing of the turbine is disturbed, we use emergency governing. These governors come into action only when there are emergencies in the turbine.

15. The fluid coming into the centrifugal pump is accelerated by ________
a) Throttle
b) Impeller
c) Nozzle
d) Governor

View Answer

Answer: b [Reason:] The fluid coming into the centrifugal pump is accelerated by an impeller. The fluid enters the pump along a radially outward direction into the diffuser or a volute chamber.