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NCCER Mobile Crane Operations Terms > Machine Power Flow > Flashcards

Machine Power Flow Flashcards

1
Q

A device that converts the fluid energy of the hydraulic system into mechanical energy using a hydraulic cylinder or motor

A

Actuator (hydraulic)

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2
Q

A current that periodically reverses its direction of flow

A

Alternating current (AC)

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3
Q

The surrounding or circulating temperature of a fluid or object

A

Ambient temperature

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4
Q

A mechanism for temporarily keeping one part in a certain position relative to that of another, released by application of force to one of the parts

A

Detent 

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5
Q

An electrical current that flows in only One Direction

A

Direct current (DC)

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6
Q

Mechanical device used for engaging and disengaging one rotating element from another rotating element, such as a shaft

A

Clutch

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7
Q

A machine that converts the energy of a fuel into mechanical energy or power to produce force and motion

A

Engine

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8
Q

A mechanical or hydraulic device used to control the speed of an engine

A

Governor

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9
Q

Operated by the pressure created by forcing water, oil, or another liquid through a comparatively narrow pipe or orifice

A

Hydraulic

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10
Q

A machine that converts electrical energy into mechanical energy

A

Motor

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11
Q

A scientific law stating that pressure at any one point in a closed static fluid system will be applied to all points in the system in every direction and will exert equal forces on equal areas; the basis of hydraulic theory

A

Pascal’s law

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12
Q

Operated by air or by the pressure or exhaustion of air.

A

Pneumatic

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13
Q

Transforms hydraulic working energy into rotary mechanical energy, which is applied to a resisting object by means of a shaft.

A

Pump (hydraulic)

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14
Q

An electromagnetic coil used to control a mechanical device such as a valve or relay contacts

A

Solenoid

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15
Q

Constriction due to a decrease in temperature

A

Thermal expansion

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16
Q

A device that uses fluid, usually oil, to transmit torque from one shaft to another

A

Torque converter (fluid coupler)

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17
Q

A power train device that transfers power directly from the engine to the axle without relying on a drive shaft

A

Transaxle

18
Q

The main purpose of the power system is to…

A

convert power to work

19
Q

The amount of air delivered to each of the engine’s cylinders in a Diesel engine is increased by the use of a(n)…

A

turbocharger

20
Q

Diesel engine fuel is delivered under high pressure directly into the combustion cylinder by a …

A

fuel injection pump

21
Q

Diesel fuel from a low-pressure pump is injected into a diesel engine cylinder by a….

A

cam-operated injector

22
Q

When working on a coolant system, the operator should…

A

allow the system to cool before adding coolant

23
Q

The _____ regulates the flow of the coolant through the engine, which controls the temperature of the engine.

A

thermostat

24
Q

Which sentence best describes direct current (DC)?

A

Electric current that flows in only one direction

25
Q

In the electrical system of a crane, the 12-volt generator portion of the system provides power for the _____ systems

A

auxiliary

26
Q

The pressure-regulating valve in the oil system of a diesel engine…

A

bypasses a small amount of pressurized oil from the system back to the sump if the system pressure gets too high

27
Q

The two types of diesel engine lubrication systems are the bypass system and the _____ system

A

full-flow

28
Q

A dust unloading valve is used in the _____ system of an engine.

A

air filtration

29
Q

In a gasoline engine, a(n) _____ is introduced to cause an explosion of the fuel and air mixture

A

electrical spark

30
Q

An advantage of the gasoline/propane engine over a Diesel engine is the…

A

amount of power that can be generated in a short time

31
Q

Electrical energy is converted into mechanical energy by a(n)…

A

motor

32
Q

A mechanical device used for engaging and disengaging one rotating element from another rotating element is a(n) …

A

clutch

33
Q

The crawler crane uses the _____ of each track for steering purposes.

A

independent drive

34
Q

A mechanism for temporarily keeping one part in a certain position relative to that of another is a…

A

detent

35
Q

The operator should dog the _____ before releasing pressure on a hydraulic system.

A

hoist motors

36
Q

The operator should retract the _____ as much as possible to prevent overfilling of the reservoir tank.

A

hydraulic cylinder

37
Q

A device that uses fluid to transmit torque from one shaft to another is a torque…

A

converter

38
Q

A torque converter replaces a conventional _____ system.

A

clutch

39
Q

The hydraulic _____ is driven from the output of the transmission or gearbox to supply necessary fluid flow.

A

pump

40
Q

A type of motor that can be stalled for indefinite periods and instantly reversed without damage is a(n) _____ motor.

A

hydraulic

41
Q

The surrounding or circulating temperature of a fluid or object is known as the…

A

ambient temperature

42
Q

Most electric motors have a weight-to-horsepower ratio of …

A

10lbs / hp

NCCER Mobile Crane Operations Terms (4 decks)

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