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POWER > Power > Flashcards

Power Flashcards

1
Q

Motor with low starting load. Torque can be obtained by providing a separate winding or auxiliary phase 90 displaced in space eom main winding

A

Split-phase motor

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2
Q

Motor capable of starting heavier load than split phase motor.

A

Capacitor -Start Inductor motor

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3
Q

Motor that develops high starting torque. Torque can be obtained by providing a winding and commutator on the rotor with a single pair of short circuited brushes for starting

A

Repulsion Start induction motor

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4
Q

Holds the parts of motor together and protect the internal components from the environment

A

Enclosure

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5
Q

The stationary part of the motor which is sometime referred to as windings.

A

Stator

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6
Q

The rotating part of the motor where the magnetic field from stator induces an opposing magnetic field onto the rotor causing it to push away from the stator field.

A

Rotor

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7
Q

Shaft height in inches for integral horsepower motors may be obtained by.

A

Dividing the first two no. of the frame size by four.

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8
Q

Shaft height in inches for fractional horsepower motors may be obtained by.

A

Dividing the first two no. of the frame size by 16.

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9
Q

What are the integral horsepower motors.

A

Those hp greater than 1.

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10
Q

What are fractional hp

A

Those hp lower than 1

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11
Q

At all time from start to full speed, the torque supplied by the motor is greater than

A

Required by the load.

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12
Q

If the load torque is higher than motor torque, the motor will ____.

A

Stall.

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13
Q

Type of service in which the motor us operated for more than 60 minutes at a time.

A

Continuous Duty

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14
Q

Type of service wherein it is operated for up to 30 mins. at a time with a rest or cooling period between operation

A

Intermittent duty type

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15
Q

Service factor for an integral horsepower motors.

A

1.15

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16
Q

Service factors for fractional horsepower.

A

1.25 for 3/4 ho to 1.4 for 1/20 hp

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17
Q

The greater the horsepower rating of the motor, the greater the ____

A

Motors ability to develop mechanical power.

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18
Q

Available horsepower rating of motors

A

1/6, 1/4, 1/3, 3/4, 1, 1.5, 2,3,5,7.5

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19
Q

Most common speed of the motor ranges from

A

1700 to 1750 rpm

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20
Q

If motor will replace a man, how much hp can the motor do the job.

A

1/4 hp

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21
Q

To replace the an engine to motor, multiply the engine hp by

A

2/3

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22
Q

Solar power application where it rely on heat energy coming from the sun.

A

Thermal or heat based application

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23
Q

A solar application wherein it relies on the illumination-spectrum intensity coming from the sun.

A

Photovoltaic application

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24
Q

A machine that convert the kinetic energy of the wind to mechanical power for pumping water

A

Wind pump

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25
Q

A machine that converts wind kinetic energy into electrical energy using fast rotating rotor

A

Wind turbine

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26
Q

Refers to all organic materials that originate from living organisms such as wood, agricultural residues, animal wastes and other.

A

Biomass

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27
Q

Thermochemical conversion

A
  • Gasification
  • Pyrolysis and carbonization
  • Combustion (cook stove)
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28
Q

Biochemical Conversion

A
  • Ethanol Production

* Biogas Production (Anaerobic digestion)

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29
Q

Engine that burns fuel and air inside a combustion chamber located within the engine proper

A

ICE, internal combustion engine

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30
Q

Confines the expanding gases and forms the combustion chamber

A

Cylinder blocks

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31
Q

Forms a cover on one end of the cylinder

A

Cylinder head

32
Q

Covers the other end of the cylinder, slides inside the cylinder to transmit the force of expansion to the connecting rod and drives the crankshaft into rotary motion

A

Piston

33
Q

Effects a tight seal against the cylinder wall

A

Piston rings.

34
Q

Transmit the power of combustion from the piston to the crankshaft

A

Connecting rod

35
Q

Converts the reciprocating motion of the piston to rotary motion by means of a crank and twi bearing supports

A

Crankshaft

36
Q

Stores energy during the power stroke and returns this energy during the idle strokes producing a uniform rotatiib

A

Flywheel

37
Q

Open and close the ports leading into and out if the combustion chamber

A

Valve

38
Q

Produces the spark to initiate the ignition of the fuel and mixture

A

Spark plug

39
Q

Covers the crankshaft and holds the oil for the lubrication of the moving parts

A

Crankcase

40
Q

Actuates the valve through a rocker arm to open and close during engine operation

A

Camshaft

41
Q

Retain compression, reduce cylinder wall contact thereby reduce friction losses and wear

A

Piston rings (compression and oil rings)

42
Q

Joins the connecting rod and the piston

A

Piston pin

43
Q

Is where engine oil is container to lubricate the engine

A

Oil pan

44
Q

Used in measuring the level of lubricating oil at the engine

A

Dipstick

45
Q

It is where the camshaft located

A

Cylinder head

46
Q

Leakage of combustion gases between a piston and the cylinder wall into the crankcase in an automobile

A

Blowby

47
Q

Refers to the size of the opening of the cylinder which is almost equal to the diameter of the piston plus the rings

A

Bore

48
Q

Refers to the distance traveled by a piston from TDC to BDC

A

Stroke

49
Q

The volume displaced by a piston in one strike

A

Piston displacement

50
Q

The volume in the combustion cylinder when the piston is at the TDC piston

A

CV- Clearance Volume

51
Q

The ration if the total volume to the clearance volume

A

Compression Ratio, CR

52
Q

The amount of pressure generated during the power stroke of the engine

A

Mean effective pressure

53
Q

Equivalent to one complete rotation of the crankshaft

A

Revolution,

4 stroke, 1 stroke = 2 rev or to complete 1 cycle, it needs 2 revolution.
2 stroke, 1 stroke = 1 rev.

54
Q

Refers to the series of events occuring one after the other in a definite order and repeating the event after the last one has occurred

A

Cycle

55
Q

Power generated at the combustion chamber

A

IHP

56
Q

The power available at the drive shaft or the crankshaft

A

BHP

57
Q

Power loss due to friction of piston and other components of the engine

A

FHP

58
Q

The power if the engine as specified by the manufacturer

A

Rated horsepower

59
Q

The ration of the brake horsepower and the indicated horsepower

A

Mechanical efficiency

60
Q

The ratio of the brake horsepower to the power available at the fuel

A

Thermal eff.

61
Q

The rate of fuel consumed of an engine per unit BHP

A

SFC

62
Q

The min. speed of the engine at no load, usually runs at around 900 rpm

A

Idle speed

63
Q

The opening adjustment of the engine throttle at the best operating condition, which is usually 75% of the total opening

A

Optimum throttle opening

64
Q

Provides a passage to the intake valve porte in the head

A

Intake manifold

65
Q

Uses spark to ignite the fuel, uses gasoline and has a carburetor to mix fuel and air.

A

Spark-ignition engine

66
Q

Uses an automizer(fuel injector) to spray the fuel inside the engine

A

Compression - ignition engine

67
Q

The compression ratio of Compression engine ranges from

A

14-22:1

68
Q

The CR of SI ranges from 5-8:1

A
69
Q

A/F of CI is

A

15-100 to 1

70
Q

A/F for SI is____

A

12-15 to 1

71
Q

Fuel consumption og CI is

A

Low

72
Q

Fuel consumption of SI

A

High

73
Q

Starting characteristics of CI is

A

Hard

74
Q

Starting characteristics for SI is

A

Easy

75
Q

Produces power in one revolution of the crankshaft

A

2S cycle engine

76
Q

Usually high speed and light in weight

A

2S cycle engine

77
Q

Produces power in two revolutions of the crankshaft

A

4S cycle engine

POWER (1 decks)

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