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FARM ELECTRIFICATION Prepared by: Marlon T. Delos Santos, M.Sc. > FARM ELECTRIFICATION > Flashcards

FARM ELECTRIFICATION Flashcards

1
Q

The safe current carrying capacity of electric conductors.

A

Ampacity

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2
Q

In the operation of AC generator, this variable is dependent on the speed of rotation of the motor and the number of poles.

A

Frequency

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3
Q

The Philippine electrical code specifies that all wall switches be installed on the _______________ of the door

A

Latch side

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4
Q

This information provides the equipment manufacturer with a means of conveying to costumers the rated electrical values and output capacities of equipment.

A

nameplate

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5
Q

A machine that converts electrical energy into mechanical energy is;

A

motor

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6
Q

It is the source of electrical pressure (3)

A

Battery
Thermocouple
Generator

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7
Q

Percentage energy conversion of an average farm electric motor

A

75

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8
Q

It is the rate of converting energy

A

Power

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9
Q

It is the portion of electric conductor that extends from service-entrance switch to a certain group of outlets or to a single outlet.

A

Branch circuit

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10
Q

A device use to protect branch circuit form overloading.

A

Circuit breaker

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11
Q

Another term used for circuit breaker

A

Fuse

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12
Q

An item commonly referred to as convenient outlet

A

Receptacle

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13
Q

It is the number of wattage required by an electrical equipment in use in the building.

A

Electrical load

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14
Q

The minimum load design value for feeder- line and service-entrance switch for general purpose barn

A

3 watts/ft2 + 1320 watts/hp each motor

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15
Q

It is the centroidal point of the electric system

A

Electric load center

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16
Q

Factors to consider in selecting feeder lines. (3)

A

Size of wire to safely carry the current
Type and location of wire adapted to its surrounding
Size of wire to prevent excessive pressure loss or voltage drop

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17
Q

The wire that is extending from the distribution center to the consumer property.

A

Feeder line

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18
Q

A circular mill refers to

A

The arc of a circle which has a diameter of 1/1000 of an inch

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19
Q

It is the amount of electrical pressure used not to advantage

A

Voltage drop

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20
Q

The unit used when specifying the intensity of light needed for various seeing task.

A

Foot candles

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21
Q

It is the ratio of the quantity in working place to the quantity of light output from the source.

A

Room index

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22
Q

Electrical equipment used to open and to close a circuit

A

Switch

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23
Q

A type of switch having contacts which are operated by magnetism

A

Relay

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24
Q

It is an electrically-controlled switch for regulating the flow of liquid or of gas.

A

Solenoid valve

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25
Q

A special kind of switch used to control temperature.

A

Thermostat

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26
Q

It is an automatic switch used to control the level of liquid

A

Float switch

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27
Q

An electrical switch that controls the movement of some other pieces of materials or machines such as the travel of rope, chain, or carriage

A

Limit switch

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28
Q

Most common electric motor speed

A

1700 – 1750 rpm

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29
Q

An allowable overload for a motor indicated by a multiplier that when applied to a normal horsepower rating indicates the permissible loading

A

Service factor

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30
Q

An electrically-operated device that converts one type of energy into another type

A

Transducer

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31
Q

A magnetic device used to convert electrical energy into linear motion

A

Solenoid

32
Q

An electrical device that changes one value of AC voltage into another value.

A

Transformer

33
Q

A motor that develops more starting torque and is best suited for hardest-to-start load.

A

Repulsion start induction motor

34
Q

A motor adapted for load that are easy to start such as centrifugal pumps, bench grinder, and others.

A

Split-phase motor

35
Q

Wiring connection used for lights on small appliance in farm buildings

A

Parallel connection

36
Q

When the current is the same throughout all the parts of the circuit, the circuit line is

A

In series

37
Q

A temperature-response mechanism used to control heating system and cooling system with the object of monitoring certain temperature without further personal attention.

A

Thermostat

38
Q

A current which, when flowing through a given resistance, is practically unvarying and going in one direction only.

A

DC

39
Q

A rotating machine that converts electrical power into mechanical power.

A

Electric motor

40
Q

A rotating machine that converts mechanical power to electrical power.

A

Generator

41
Q

The ratio of the maximum demand power to the total connecting load.

A

Demand factor

42
Q

The ratio of the average load to the maximum demand of a system.

A

Load factor

43
Q

The ratio of the true power to the apparent power.

A

Power factor

44
Q

The property of the material that prevents the flow of current and at the same time electrical energy is converted into heat.

A

Resistance

45
Q

The property of an electrical circuit which opposes a change in current. It is also referred to as the fly-wheel effect of an electric circuit.

A

Inductance

46
Q

The property of an electric circuit that enables it to store an electric charge.

A

Capacitance

47
Q

The practical unit of inductance

A

Henry

48
Q

The practical unit of capacitance

A

Farad

49
Q

The ratio of the applied voltage to the resultant steady-state current

A

Impedance

50
Q

Type of kilowatt-hour meter that is read exactly in like manner as the mileage indicator of the automobile.

A

Cyclometer type

51
Q

A kilowatt-hour meter with four dials and each dial is calibrated in opposite direction and dial readings from left to right give thousands, hundreds, tens, and single units of kilowatt-hour respectively.

A

Pointer-dial type

52
Q

The number of watts required for an electrical equipment in used in building.

A

Electric load

53
Q

Type of distribution center where the kilowatt-hour meter and the disconnect-switch are located outside of one of the buildings

A

Outdoors

54
Q

Type of distribution center where the meter and the disconnect switch are located on a main distribution pole.

A

Pole type

55
Q

It refers to a certain amount of electrical pressure or volts used but not to advantage.

A

Voltage drop

56
Q

Which of the following are the motor’s jobs (3)

A

To drive the load at proper speed
To withstand the “abuse” of its surroundings
To start the load

57
Q

Classification of AC motors according to power source with a single set of windings and 1 slip ring which produces single wave of voltage.

A

Single phase

58
Q

Classification of AC motors according to power source with three sets of windings and 3 slip ring which produces three waves of voltage.

A

Poly phase

59
Q

Classification of AC motors according to principles and characteristics of operation that runs at an exact speed for all loads up to the pull- out point.

A

Synchronous

60
Q

Classification of AC motors according to principles and characteristics of operation that provides good starting torque, good running torque, variable speed and approximately constant Hp output.

A

Series

61
Q

Classification of AC motors according to principles and characteristics of operation that runs at constant speed, variable torque, variable Hp, average power factor and average efficiency.

A

Induction

62
Q

The most basic of all electrical controls and its purpose is to open and to close an electric circuit or to start and to stop the flow of electricity.

A

Switch

63
Q

A type of switch having contacts that is operated by magnetism.

A

Relays

64
Q

It protects the motor due to its built-in overload device that automatically trips the switch in case too much current will flow to the motor.

A

Magnetic-starting switch

65
Q

This switch incorporates into one unit the principles of the relay coil, the overload heater and strips, and the pushbutton
control.

A

Magnetic-starting switch

66
Q

It reduces the voltage to the motor when the motor is starting and applies the full voltage when the motor has gained
sufficient speed.

A

Reduce-voltage

switch

67
Q

This type of control is operated by electricity but it is used to control the flow of water, oil or gas.

A

Solenoid valve

68
Q

Special kind of switch that must open and close automatically in response to changes in temperature.

A

Thermostat

69
Q

This type of thermostat is used for heating or cooling but the switch contacts are operated by the action of the bellows.

A

Bellows thermostat

70
Q

This thermostat makes use of two unlike metals that do not expand in the same amount.

A

Bimetallic thermostat

71
Q

A type of thermostat is composed of two hollow metal discs, the switch and its contacts, and a frame for holding the parts in place.

A

Wafer thermostat

72
Q

A type of switch has an electric clock that automatically operates switch contacts at definite time intervals.

A

Time switch

73
Q

Type of switch that is useful in farm applications and is desired to limit the travel of rope, chain or carriage.

A

Limit switch

74
Q

An automatic control having switch contacts which are operated according to various gas or liquid pressure.

A

Pressure switch

75
Q

An invisible agent that produces such effects such light, heat, power, and sound.

A

Electricity

FARM ELECTRIFICATION Prepared by: Marlon T. Delos Santos, M.Sc. (2 decks)

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