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MarPow > Midterm (Quizzes) > Flashcards

Midterm (Quizzes) Flashcards

1
Q

In this pump, the first stroke of the piston creates a vacuum, opens an inlet valve, closes the outlet valve and draws fluid into the piston chamber (the suction phase).

A

Piston Pump

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2
Q

These pumps can handle high thickness fluids & solids without hurting them

A

Lobe Pumps

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3
Q

It operates on the same principle, but the two interlocking gears are of different sizes with one rotating inside the other

A

Gear Pump

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4
Q

It is essentially resistance to flow

A

Viscosity

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5
Q

As the fluid enters the pump, it becomes trapped between the gaps in the ____

A

screws

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6
Q

These pumps are a kind of rotating positive dislocation pump, which means they force a stable amount of liquid for every revolution

A

Gear Pump

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7
Q

It is a type of positive-displacement pump that consists of vanes mounted to a rotor that rotates inside a cavity

A

Rotary Vane Pump

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8
Q

It operates by alternating filling a cavity and then displacing a given volume of liquid

A

Positive Displacement Pumps

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9
Q

A characteristic of positive displacement, and especially reciprocating, pump designs

A

Pulsing Discharge

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10
Q

What is being provided to maintain dry bilges to prevent the possibility in accumulation of water or oil?

A

Bilge System

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11
Q

It used an external and an internal spur gears.

A

Internal Gear Pump

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12
Q

This is used to transport fluids by the conversion of rotational kinetic energy to the hydrodynamic energy of the fluid flow.

A

Centrifugal Pumps

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13
Q

It used two external spur gears.

A

External Gear Pumps

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14
Q

What do cyclic action of reciprocating pumps creates in the discharge with the fluid accelerating during the compression phase and slowing during the suction phase?

A

Pulses

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15
Q

It refers to a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic energy.

A

Pump

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16
Q

In a stablizer, active fins are being cotrolled by what control system?

A

Gyroscopic

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17
Q

Part of the steering gear system that mediate the coordination between the generated hydraulic pressure from pumps and rudder stock

A

Actuator

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18
Q

The type of steering gear system which composed of four hydraulic cylinders attached to the two arms of the actuator disc, on both sides

A

Ram type steering

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19
Q

In a gyroscopic control system, how does fins counteract the external force to prevent rolling?

A

Fin’s angle

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20
Q

It an equipment which is provided in every ship to meneuver or turn the ship in different directions

A

Steering gear

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21
Q

These are fins or rotors mounted beneath the waterline and emerging laterally from the hull to reduce a ship’s roll due to wind or waves.

A

Stabilizer

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22
Q

A type of steering gear system which fluid pressure is developed through purely mechanical means.

A

Fully hydraulic

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23
Q

Fins in large vessels are provided with flaps to increase the fins lift by how many percent?

A

15%

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24
Q

Which of the following statement regarding steering gear is true?

A

It can only be operated when the ship is in motion

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25
Q

Steering gear actuators are now mainly electrically driven by ____

A

Power units

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26
Q

What benefits do retractable fins have over non-retractable fins?

A

It can save fuel consumption

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27
Q

Which of the following type of steering gear is predominantly used in vessels nowadays?

A

Electro-hydraulic

28
Q

In a rotary vane steering gear system, there is a fixed housing in which two vanes rotates and having ____ chamber

A

4

29
Q

In a fully electric type of steering gear system, electric motor are attached to ______

A

Steering rack

30
Q

The type of steering actuator which is commonly used for steering gear system and quite expensive.

A

Ram type steering

31
Q

How does fixed fins and keel reduce the roll of the vessel?

A

Hydrodynamic drag

32
Q

They play a crucial role in generating the required pressure to create motions in the steering gear which can trigger the necessary rotary moments in the rudder system.

A

Hydraulic pump

33
Q

Which of the following statements regarding stabilizers are true?

A

They are efficient in higher velocity

34
Q

Which type of steering gear system that hydraulic pumps are being replaced by electric motors?

A

Fully Electric

35
Q

Steering gear system can be classified into two according to the type of actuator they have which are ____ and ____

A

Ram and rotary vane

36
Q

Which type of generator is suitable for running bigger motors and appliances?

A

DC-powered generator

37
Q

It is a machine that transforms electric energy into mechanical energy in form of rotation.

A

DC Motor

38
Q

The type of motor which is being used in applications where the loads varies from time to time.

A

Induction Motor

39
Q

Which of the following is true regarding the DC generators?

A

Easy to parallel with

40
Q

It is a part of motor is composed of stationary set of conductors wound in coils on an iron core.

A

Stator

41
Q

The type of motors which uses brushes and a commutator to operate.

A

DC motors

42
Q

Generators and motors work on the principle of magnetic induction in which _____ is induced by a changing magnetic field.

A

Voltage

43
Q

It is an AC electric motor in which the electric current in the rotor needed to produce torque and is obtained by electromagnetic induction.

A

Induction motor

44
Q

The type of motors which do not use brushes and a commutator to operate.

A

AC Motors

45
Q

What is the fundamental difference between the alternating current and direct current?

A

Direction of flow

46
Q

Which of the following converts alternating current into direct current and vice versa?

A

Converter

47
Q

Which of the following equipment converts alternating current into direct current?

A

Rectifier

48
Q

It is an equipment which convert mechanical energy into electrical energy.

A

Generator

49
Q

It is an electrical generator that converts mechanical energy to electrical energy.

A

Alternator

50
Q

It is an equipment which convert electrical energy into mechanical energy.

A

Motor

51
Q

Ventilation is being used to remove or dissipate gases from the cargo hold such as CO2 and ethylene which came from ______

A

Fruits

52
Q

It is a system or a machine that treats air in a enclosed area via a refrigeration cycle in which warm air is removed and replaced with cooler and more humid air.

A

Air conditioning

53
Q

Which of the following is not a component of refrigeration plant?

A

Ventilation

54
Q

Ventilation system can be categorized into four types: exhaust, supply, ______ and ______.

A

Balanced - heat recovery

55
Q

It is the intentional introduction of ambient air into a space and is mainly used to control indoor air quality by diluting and displacing indoor pollutants.

A

Ventilation

56
Q

What components of refrigeration plant that drive fluid around the plant.

A

Compressor

57
Q

The type of ventilation system in a insulated compartment where temperature and carbon dioxide is being controlled.

A

Temperature control system

58
Q

It is the component of the refrigeration plant where the refrigerant’s temperature and pressure is being reduced.

A

Expansion valve

59
Q

The component of the refrigeration plant where the vapor refrigerant is being condensed into liquid.

A

Condenser

60
Q

When stowing containers under the deck, which of the following should be remembered?

A

Take maximum advantage of any mechanical ventilation

61
Q

The condensation in the cargo hold of a ship can appear in two basic form which are ______ and _______.

A

Ship sweat - Cargo sweat

62
Q

Which of the following statements is not true regarding ventilation?

A

Ventilation can handle pockets of moisture in a cargo tank.

63
Q

What component of the refrigeration plant that is located the space being cooled?

A

Evaporator

64
Q

Condensation on the side of the tank adjacent to the sea water normally produce sweat because of the temperature of metal is _______
of the surrounding air.

A

Below the dew point

65
Q

It is used to reduce the dew point of air in ships’ compartments by de-humidification to the point at which ships’ sweat and cargo sweat cannot occur.

A

Mechanical ventilation

MarPow (6 decks)

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