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Why do we need to study about pumps?

Total questions: 88

Worksheet time: 44mins

Name
Class
Date
1.

Pumps are an integral _______ equipment common to all ships.

a)

auxiliary

b)

primary

c)

decorative

d)

navigation

2.

Overview: Pumps are used in engine room, main engine, generator engine systems, liquid cargo operations, ballasting operations, etc. Which of the following is NOT a use of pumps on ships?

a)

Engine room

b)

Main engine

c)

Cooking food

d)

Ballasting operations

3.

In case of emergencies like flooding and fires, pumps are also essential.

a)

True

b)

False

4.

The purpose of Marine pumps and the types of other pumps used on board ships can be described as:

a)

Marine pumps are used for transferring fluids and include types such as centrifugal, reciprocating, and gear pumps.

b)

Marine pumps are only used for air circulation and include only vacuum pumps.

c)

Marine pumps are used exclusively for fuel transfer and include only screw pumps.

d)

Marine pumps are not essential equipment and are rarely found on ships.

5.

Which of the following best describes the construction, operation, and application of rotary displacement pumps, including gear pumps, screw pumps, and rotary vane pumps?

a)

They use rotating elements to displace fluid and are commonly used for pumping viscous liquids.

b)

They rely on centrifugal force to move fluids and are best for high-flow, low-pressure applications.

c)

They use reciprocating motion to move fluids and are ideal for high-pressure, low-flow situations.

d)

They operate using diaphragm movement and are mainly used for metering small quantities of fluid.

6.

The purpose and function of components of a centrifugal pump are to:

a)

Convert mechanical energy into hydraulic energy and move fluids efficiently.

b)

Store electrical energy for later use.

c)

Measure the temperature of fluids passing through the pump.

d)

Filter impurities from the fluid before it enters the pump.

7.

The characteristic of a centrifugal pump with respect to suction lift, priming, discharge pressure, and vapour in liquid is:

a)

It requires priming, has limited suction lift, moderate discharge pressure, and cannot handle vapour in liquid.

b)

It does not require priming, has unlimited suction lift, high discharge pressure, and can handle vapour in liquid.

c)

It requires priming, has unlimited suction lift, low discharge pressure, and can handle vapour in liquid.

d)

It does not require priming, has limited suction lift, high discharge pressure, and cannot handle vapour in liquid.

8.

Maintenance checks on submersible pumps, mono pumps, variable delivery pumps, and swash plate pumps involve:

a)

Inspecting for leaks, checking electrical connections, monitoring vibration, and ensuring proper lubrication.

b)

Only checking the pump casing for cracks.

c)

Running the pumps continuously without inspection.

d)

Ignoring electrical connections and focusing only on fluid levels.

9.

Troubleshooting displacement and centrifugal pumps involves which of the following steps?

a)

Checking for leaks, inspecting seals, and monitoring pressure levels

b)

Ignoring unusual noises and vibrations

c)

Running the pump at maximum speed regardless of issues

d)

Replacing the pump without any inspection

10.

The purpose and requirement of the bilge pumping system, emergency bilge suction, emergency fire pump, and ballast pumping system is to:

a)

Ensure removal of unwanted water, provide emergency dewatering and firefighting, and manage vessel stability.

b)

Increase the speed of the vessel and improve fuel efficiency.

c)

Monitor engine performance and control navigation systems.

d)

Supply fresh water to crew quarters and galley areas.

11.

What is one function of a pump?

a)

Transfer fluid between two points

b)

Generate electricity

c)

Store fluid

d)

Cool fluid

12.

One function of a pump is to produce required ________.

a)

flow rate

b)

temperature

c)

voltage

d)

pressure

13.

A pump is used to produce required ________.

a)

pressure

b)

temperature

c)

velocity

d)

volume

14.

Which of the following does a pump change in a fluid?

a)

Only velocity

b)

Only pressure

c)

Both velocity and pressure

d)

Neither velocity nor pressure

15.

What does a pump add to the system?

a)

Pressure

b)

Energy

c)

Flow

d)

Resistance

16.

Power supplied to the pump is used to transfer fluid at specified flow rate and pressure by overcoming resistance in the pump and the system.

a)

True

b)

False

17.

A pump does not create ________, it only provides flow. Pressure is just an indication of the amount of resistance to the flow.

a)

pressure

b)

heat

c)

vacuum

d)

energy

18.

Viscosity of the fluid pumped must be within the range specified in the pump design.

a)

True

b)

False

19.

Which type of pump can handle any required viscosity?

a)

Centrifugal Pump

b)

Reciprocating Displacement Pump

c)

Rotary Positive Displacement Pump

d)

Screw Pump

20.

Rotary Positive Displacement Pumps (Common- Gear and Screw) are used for ______ range of viscosities.

a)

intermediate

b)

low

c)

very high

d)

narrow

21.

Centrifugal Pumps are used for Medium to Low range of viscosities.

a)

True

b)

False

22.

Onboard ships, permission should be obtained before any fluids are moved, which might affect the stability of the ship.

a)

True

b)

False

23.

One use of pumps onboard ship is the ___

a)

transfer of oil and other fluids from tanks, machinery or other equipment

b)

navigation of the vessel

c)

operation of radar systems

d)

preparation of food in the galley

24.

Pumps are used for ________ operation (discharging cargo in tankers) onboard ship.

a)

cargo

b)

navigation

c)

anchoring

d)

steering

25.

Pumps are used for ________ operation onboard ship.

a)

ballasting

b)

navigation

c)

cooking

d)

painting

26.

Pumps are used for ________ onboard ship.

a)

fire fighting

b)

navigation

c)

cooking

d)

painting

27.

Pumps are used to pump out ________ in case of vessel ingress onboard ship.

a)

seawater

b)

oil

c)

air

d)

fuel

28.

Pumps are used for ________ prevention onboard ship.

a)

oil spill

b)

fire

c)

collision

d)

theft

29.

What is the full form of NPSH?

a)

Net Positive Suction Head

b)

Negative Pressure Suction Head

c)

Nominal Pressure Safety Head

d)

Normal Pump Suction Height

30.

Why is the Net Positive Suction Head (NPSH) margin important when selecting a pump?

a)

It determines the color of the pump

b)

It is a crucial factor that is commonly overlooked while selecting a pump

c)

It affects the pump's weight

d)

It is not important

31.

What is the difference between NPSHa and NPSHr at the pump’s inlet?

a)

NPSHa is the available Net Positive Suction Head, and NPSHr is the required Net Positive Suction Head by the pump to operate without cavitation

b)

NPSHa is the required Net Positive Suction Head, and NPSHr is the available Net Positive Suction Head

c)

Both are the same

d)

NPSHa and NPSHr are unrelated

32.

What is cavitation? Cavitation is the formation of _______ at the pump inlet, followed by their sudden collapse, which can cause permanent damage.

a)

bubbles

b)

crystals

c)

solids

d)

gases

33.

Why must the NPSH margin value be positive? The NPSH margin value must be _______ to avoid cavitation.

a)

positive

b)

negative

c)

zero

d)

undefined

34.

Look at the image on the left. What phenomenon is shown on the metal surface?

a)

Corrosion

b)

Cavitation

c)

Fatigue

d)

Erosion

35.

Cavitation can cause damage to metal surfaces in pumps and turbines.

a)

True

b)

False

36.

In the diagram on the right, cavitation occurs in the areas where the fluid flow creates low pressure zones. Cavitation is the formation of ________ in a liquid due to rapid changes in pressure.

a)

bubbles or vapor cavities

b)

ice crystals

c)

solid particles

d)

foam

37.

Considering the total energy of a fluid moving, every time a fluid increases its velocity, its pressure _________?

a)

decreases

b)

increases

c)

remains the same

d)

doubles

38.

This relationship between velocity and pressure produces some unwelcome effects with respect to:

a)

Electrical machinery

b)

Hydraulic machinery, pipes, and hydraulic structures

c)

Thermal machinery

d)

Pneumatic machinery

39.

These problems arise when the absolute pressure falls sufficiently for the small quantity of air that is dissolved in the water to be released followed by local vaporization of the liquid. What is this phenomenon called?

a)

Condensation

b)

Cavitation

c)

Sublimation

d)

Precipitation

40.

It results in small bubbles of vapour being formed that gradually get bigger. What happens to these bubbles when pressure increases?

a)

They expand

b)

They implode

c)

They float

d)

They solidify

41.

Cavitation occurs when the absolute pressure falls sufficiently for the small quantity of air dissolved in the water to be released, followed by local ________ of the liquid.

a)

vaporization

b)

condensation

c)

solidification

d)

oxidation

42.

One of the factors affecting suction lift is ________ and volatility of the fluid.

a)

Temperature

b)

Pressure

c)

Density

d)

Viscosity

43.

________ exerted on the free side of the liquid is a factor affecting suction lift.

a)

Pressure

b)

Temperature

c)

Viscosity

d)

Density

44.

Friction losses at entrances, bends and pipes in the ________ system affect suction lift.

a)

suction

b)

delivery

c)

ventilation

d)

cooling

45.

A prime mover is a term for a machine or device that converts other forms of energy into ________ mechanical energy.

a)

rotational

b)

thermal

c)

chemical

d)

electrical

46.

Which of the following is a type of pump prime mover?

a)

Electric motor

b)

Solar panel

c)

Wind turbine

d)

Battery

47.

Which of the following is NOT listed as a type of pump prime mover?

a)

Hydraulic motor

b)

Pneumatic

c)

Electric motor

d)

Steam engine

48.

One type of pump prime mover mentioned in the list is:

a)

Electric motor

b)

Solar panel

c)

Wind turbine

d)

Steam engine

49.

There are circumstances where it may be desirable to use two or more pumps operating together instead of one large machine. What are the three choices for pump operation?

a)

Single machine

b)

Pumps in series

c)

Pumps in parallel

d)

All of the above

50.

There are circumstances where it may be desirable to use two or more pumps operating together instead of one large machine. One of the choices for pump operation is _________.

a)

Single machine

b)

Parallel operation

c)

Series operation

d)

Multiple stage operation

51.

There are circumstances where it may be desirable to use two or more pumps operating together instead of one large machine. One of the choices for pump operation is _________?

a)

Pumps in series

b)

Pumps in parallel

c)

Pumps in reverse

d)

Pumps in isolation

52.

There are circumstances where it may be desirable to use two or more pumps operating together instead of one large machine. One of the choices for pump operation is _________

a)

Pumps in parallel

b)

Pumps in series

c)

Pumps with variable speed drives

d)

Pumps with different impeller sizes

53.

Why is it preferable to use several small machines operating at peak efficiency when the required discharge varies over a wide range?

a)

Because the required discharge varies over a wide range, hence it is preferable to use several small machines operating at the peak efficiency.

b)

Because small machines are always cheaper than large machines.

c)

Because large machines cannot operate at all under varying discharge.

d)

Because small machines require less maintenance than large machines.

54.

What does it mean if Q and H are out of the range of the individual machine?

a)

It means that the required flow rate (Q) and head (H) cannot be achieved by a single pump, so a combination of pumps is needed.

b)

It means the machine will automatically adjust to any required flow rate and head.

c)

It means the machine will operate more efficiently at higher values of Q and H.

d)

It means the machine will shut down to prevent damage.

55.

What is the advantage of splitting the duty between several pumps if the pump is in continuous use?

a)

Splitting the duty between several pumps allows one to be on standby to provide emergency backup in the event of a breakdown, and for planned maintenance.

b)

It increases the overall energy consumption of the system.

c)

It reduces the lifespan of each pump due to frequent switching.

d)

It complicates the control system, making it harder to operate.

56.

In pumps in series (P+P), each pump has its own _____?

a)

motor

b)

valve

c)

pipe

d)

switch

57.

In pumps in series (P+P), both pumps are fitted to the same suction and delivery pipes, i.e., the same water passes through each of the pumps in _____

a)

turn

b)

parallel

c)

reverse

d)

opposite

58.

In pumps in series (P+P), Q is the same as a single pump but the head is _____, hence we obtain by doubling it for a given Q.

a)

doubled

b)

halved

c)

unchanged

d)

reduced

59.

What is one advantage of pumps in series (P+P)?

a)

We can cover a high range of H.

b)

The system never fails.

c)

It reduces friction completely.

d)

It decreases capacity.

60.

What happens if one pump in a series system breaks?

a)

The whole system fails

b)

The other pumps work harder

c)

The system continues to work

d)

The capacity increases

61.

Fill in the blank: The specific speed for each unit in series is given by the formula _______.

a)

NQ(H/n)3/4\frac{N\sqrt{Q}}{(H/n)^{3/4}}

b)

NQ0.5H0.75\frac{NQ^{0.5}}{H^{0.75}}

c)

NQH0.5\frac{NQ}{H^{0.5}}

d)

NQH1.5\frac{N\sqrt{Q}}{H^{1.5}}

62.

If friction consists the major part of the system curve, series operations provide more capacity.

a)

True

b)

False

63.

What is the effect of connecting two pumps in series on the head (ha) compared to a single pump?

a)

The head is doubled

b)

The head remains the same

c)

The head is halved

d)

The head decreases

64.

At point (B) on the system curve, how many pumps are operating in series?

a)

One pump

b)

Two pumps

65.

When two pumps are connected in series, the total head (ha) is ______ compared to a single pump.

a)

higher

b)

lower

c)

the same

d)

zero

66.

Pumps in parallel (P//P): Each pump has its own suction pipe but delivers into a _________

a)

common delivery pipe

b)

separate delivery pipe

c)

common suction pipe

d)

individual reservoir

67.

Pumps in parallel (P//P): The head obtained from the two pumps is the same as for a single pump, but the ________ is doubled.

a)

discharge

b)

head

c)

efficiency

d)

power

68.

Pumps in parallel (P//P): The H-Q curve may be obtained by doubling Q for a particular H.

a)

True

b)

False

69.

Pumps in parallel (P//P) This may be the best arrangement when H is relatively constant but Q varies over a wide range. Is this statement True or False?

a)

True

b)

False

70.

If the static head component is a large portion of the system total head and friction losses are low, pumps in parallel provide more capacity. Is this statement True or False?

a)

True

b)

False

71.

Fill in the blank: The specific speed of each unit is given by the formula:

a)

Ns = N∗Q/n/H3/4N * \sqrt{Q/n} / H^{3/4}

b)

Ns = N∗Q/H(1/2)N * Q / H^{(1/2)}

c)

Ns = N / (Q * H)

d)

Ns = N∗H3/4/QN * H^{3/4} / Q

72.

What happens to the flowrate when two pumps are operated in parallel compared to a single pump?

a)

The flowrate decreases

b)

The flowrate remains the same

c)

The flowrate increases

d)

The flowrate becomes zero

73.

In the diagram titled 'Pumps in parallel (P//P)', at point (A), which configuration is being represented?

a)

Two pumps in parallel

b)

One pump

c)

System curve

d)

No pump

74.

In a parallel pump system, the total flowrate is the _______ of the individual pump flowrates.

a)

sum

b)

average

c)

difference

d)

product

75.

Which of the following is increased by pumps in SERIES?

a)

Flowrate

b)

Total dynamic head (Pressure)

c)

Temperature

d)

Total volume transferred

76.

Pumps in PARALLEL increase the ________ (i.e. Total volume transferred by the pump).

a)

flowrate

b)

pressure

c)

temperature

d)

efficiency

77.

What is the most commonly used pump in water supply systems?

a)

Centrifugal pump

b)

Reciprocating pump

c)

Gear pump

d)

Screw pump

78.

The common feature of all centrifugal pumps is the _______.

a)

Volute

b)

Impeller Shaft

c)

Nozzle

d)

Reciprocating Piston

79.

The impeller vanes in a centrifugal pump rotate to draw water into the center and discharge it by centrifugal force.

a)

True

b)

False

80.

Identify the type of mechanical component shown in the image.

a)

Gear

b)

Pulley

c)

Spring

d)

Cam

81.

What is the location of the dowel pin as indicated in the diagram?

a)

At the parting line

b)

At the center of the core

c)

Near the ejector pin

d)

At the base of the cavity

82.

According to TABLE "A", what is the packing size for a pump size of 4 x 6-10?

a)

12

b)

10

c)

14

d)

16

83.

In the diagram, what is the optional feature shown on the right side of the pump?

a)

Internal piping with seal cage

b)

External cooling fan

c)

Pressure relief valve

d)

Integrated flow meter

84.

Which of the following pump sizes has a dimension 'A' of 10.825 according to TABLE "A"?

a)

8 x 8-14

b)

8 x 8-18

c)

8 x 10-17

d)

10 x 12-12

85.

A pump changes both _______ and pressure of the fluid.

a)

velocity

b)

temperature

c)

density

d)

color

86.

A pump only adds to the system energy.

a)

True

b)

False

87.

Power supplied to the pump is to transfer fluid at specified flow rate and pressure by overcoming _______ in the pump and the system.

a)

resistance

b)

temperature

c)

velocity

d)

density

88.

A pump creates pressure and provides flow.

a)

True

b)

False

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