Farm Electrification Flashcards
The Philippine electrical code specifies that all wall switches be installed on the_______________ of the door
a. Left side
b. Hinge side
c. Latch side
d. Front side
latch side
This information provides the equipment manufacturer with a means of conveying to costumers the rated electrical values and output capacities of equipment.
a. literature
b. nametag
c. code
d. nameplate
b. nametag
A machine that converts electrical energy into mechanical energy is;
a. dynamo
b. motor
c. generator
d. stator
b. motor
It is the source of electrical pressure
a. Battery
b. Thermocouple
c. Generator
d. All of the above
d. All of the above
Percentage energy conversion of an average farm
electric motor
a. 60 %
b. 75 %
c. 90 %
d. None of the above
b. 75 %
It is the rate of converting energy
a. Power
b. Power factor
c. Work
d. None of the above
a. Power
The safe current carrying capacity of electric conductors.
a. Load current
b. Line current
c. ampacity
d. None of the above
c. ampacity
In the operation of AC generator, this variable is dependent on the speed of rotation of the motor and the number of poles.
a. slip
b. synchronous speed
c. Frequency
d. voltage regulation
c. Frequency
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
b. Wire
c. Fuse
d. All of the above
a. Branch circuit
A device use to protect branch circuit form overloading.
a. Service entrance switch
b. Circuit breaker
c. Magnetic starting switch
d. All of the above
b. Circuit breaker
Another term used for circuit breaker
a. Switch box
b. Fuse
c. Service entrance switch
d. All of the above
b. Fuse
An item commonly referred to as convenient outlet
a. Junction box
b. Switch
c. Receptacle
d. All of the above
c. Receptacle
It is the number of wattage required by an electrical equipment in use in the building.
a. Electrical load
b. Power load
c. Total load
d. All of the above
a. Electrical load
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
b. 5 watts/ft2 + 1320 watts/hp each motor
c. 10 watts/ft2 + 1320 watts/hp each motor
d. None of the above
a. 3 watts/ft2 + 1320 watts/hp each motor
It is the centroidal point of the electric system
a. Electric load center
b. Distribution center
c. Center load
d. None of the above
a. Electric load center
Factors to consider in selecting feeder lines.
a. Size of wire to safely carry the current
b. Type and location of wire adapted to its surrounding
c. Size of wire to prevent excessive pressure loss or voltage drop
d. All of the above
d. All of the above
The wire that is extending from the distribution center to the consumer property.
a. Feeder line
b. Transmission line
c. Distribution line
d. All of the above
a. Feeder line
A circular mill refers to
a. The arc of a circle which has a diameter of 1/1000 of an inch
b. The area of a circle expressed in millimeters
c. The area of a circle in inches
d. None of the above
a. The arc of a circle which has a diameter of 1/1000 of an inch
It is the amount of electrical pressure used not to advantage
a. Voltage drop
b. Voltage loss
c. Voltage reduction
d. None of the above
a. Voltage drop
A 12-ampere electric fan with 0.85 power factor is connected to a 240- volt convenient
outlet. Calculate the power in
the circuit.
a. 2,448 watts
b. 0.2448 watts
c. 2.5 kilowatts
d. None of the above
a. 2,448 watts
Power (watts) = volts x amperes x power factor
= 240 volts x 12 amp x 0.85
= 2,448 watts
The unit used when specifying the intensity of light needed for
various seeing task.
a. Foot-candles
b. Lumen
c. All of the above
d. None of the above
a. Foot-candles
It is the ratio of the quantity in working place to the quantity of light output from the source.
a. Coefficient utilization
b. Room index
c. Lighting coefficient
d. None of the above
b. Room index
Electrical equipment used to open and to close a circuit
a. Circular breaker
b. Branch circuit
c. Switch
d. All of the above
c. Switch
A type of switch having contacts which are operated by magnetism
a. Relay
b. Snap switch
c. Toggle switch
d. Two of the above
a. Relay
It is an electrically-controlled switch for regulating the flow of liquid or of gas.
a. Solinoid valve
b. Flow switch
c. Magnetic switch
d. None of the above
a. Solinoid valve
A special kind of switch used to control temperature.
a. Thermostat
b. Thermistor
c. Thermo-anemometer
d. All of the above
a. Thermostat
It is an automatic switch used to control the level of liquid
a. Level switch
b. Float switch
c. Snap switch
d. All of the above
b. Float switch
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. Float switch
b. Pressure switch
c. Limit switch
d. All of the above
c. Limit switch
Most common electric motor speed
a. 600 – 800 rpm
b. 1700 – 1750 rpm
c. 2200 – 2600 rpm
d. None of the above
b. 1700 – 1750 rpm
An allowable overload for a motor indicated by a multiplier that when applied to a normal horsepower rating indicates the permissible loading
a. Power factor
b. Service factor
c. Load factor
d. All of the above
b. Service factor
An electrically-operated device that converts one type
of energy into another type
a. Transducer
b. Transformer
c. Power converter
d. All of the above
a. Transducer
A magnetic device used to convert electrical energy into
linear motion
a. Solenoid
b. Magnetic switch
c. Relay
d. None of the above
a. Solenoid
An electrical device that changes one value of AC voltage into another value.
a. Transducer
b. Transformer
c. Voltage regulator
d. All of the above
b. Transformer
A motor that develops more starting torque and is best
suited for hardest-to-start load.
a. Split phase motor
b. Capacitor start motor
c. Repulsion start induction motor
d. All of the above
c. Repulsion start induction motor
A motor adapted for load that are easy to start such as centrifugal pumps, bench grinder, and others.
a. Split-phase motor
b. Capacitor start motor
c. Repulsion start induction motor
d. All of the above
a. Split-phase motor
Compute the input current in a 5-hp electric motor used to drive a hammer mill at 2200 rpm. The input voltage is 220 with 0.98 power factor.
a. 1.73 amperes
b. 17.3 amperes
c. 1173 amperes
d. None of the above
b. 17.3 amperes
I = P / E cosθ
= 5 hp x 746 w/hp / [220 v x 0.98 ]
= 17.3 amp
Wiring connection used for lights on small appliance in farm buildings
a. Series connection
b. Parallel connection
c. Delta-wye connection
d. All of the above
b. Parallel connection
When the current is the same throughout all the parts of
the circuit, the circuit line is
a. In series
b. In parallel
c. All of the above
d. None of the above
a. In series
A temperature-response mechanism used to control heating system and cooling system with the object of monitoring certain temperature without further
personal attention.
a. Pyrometer
b. Thermostat
c. Thermometer
d. All of the above
b. Thermostat
A current which, when flowing through a given resistance, is
practically unvarying and going in one direction only.
a. DC
b. AC
c. AC-DC
d. None of the above
a. DC
A rotating machine that converts electrical power into mechanical power.
a. Generator
b. Electric motor
c. Windmill
d. None of the above
b. Electric motor
A rotating machine that converts mechanical power to electrical power.
a. Generator
b. Electric motor
c. Windmill
d. None of the above
a. Generator
A DC motor is used to
a. Generate power
b. Charge mechanical energy to electrical
c. Convert electrical power to mechanical power
d. Increase energy output
c. Convert electrical power to mechanical power
The ratio of the maximum demand power to the total connecting load.
a. Demand factor
b. Load factor
c. Power factor
d. None of the above
a. Demand factor
The ratio of the average load to the maximum demand
of a system.
a. Demand factor
b. Load factor
c. Power factor
d. None of the above
a. Demand factor
The ratio of the true power to the apparent power.
a. Demand factor
b. Load factor
c. Power factor
d. None of the above
c. Power factor
The property of the material that prevents the flow of current and at the same time electrical energy is converted into heat.
a. Inductance
b. Capacitance
c. Resistance
d. None of the above
c. Resistance
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
b. Capacitance
c. Resistance
d. None of the above
a. Inductance
The property of an electric circuit that enables it to store an electric charge.
a. Inductance
b. Capacitance
c. Resistance
d. None of the above
b. Capacitance
The practical unit of inductance
a. Henry
b. Farad
c. Ohms
d. None of the above
a. Henry
The practical unit of capacitance
a. Henry
b. Farad
c. Ohms
d. None of the above
b. Farad
The ratio of the applied voltage to the resultant steady- state current
a. Impedance
b. Capacitance
c. Inductance
d. None of the above
a. Impedance
Type of kilowatt-hour meter that is read exactly in like manner
as the mileage indicator of the automobile.
a. Pointer-dial type
b. Cyclometer type
c. Direct reading type
d. None of the above
b. Cyclometer type
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
b. Cyclometer type
c. Direct reading type
d. None of the above
a. Pointer-dial type
The number of watts required for an electrical equipment in used in building.
a. Demand load
b. Building load
c. Electric load
d. None of the above
c. Electric load
Type of distribution center where the kilowatt-hour meter and the
disconnect-switch are located outside of one of the buildings
a. Indoor
b. Outdoors
c. Pole
d. None of the above
b. Outdoors
Type of distribution center where the meter and the disconnect switch are located on a main distribution pole.
a. Indoors
b. Outdoors
c. Pole type
d. None of the above
c. Pole type
It refers to a certain amount of electrical pressure or volts used but not to advantage.
a. Power loss
b. Voltage drop
c. Energy loss
d. None of the above
b. Voltage drop
Which of the following are the motor’s jobs
a. To drive the load at proper speed
b. To withstand the “abuse” of its surroundings
c. To start the load
d. All of the above
d. All of the above
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
b. Poly phase
c. Two phase
d. None of the above
a. Single phase
Classification of AC motors according to power source with three sets of windings and 3 slip
ring which produces three waves of voltage.
a. Single phase
b. Poly phase
c. Two phase
d. None of the above
b. Poly phase
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
b. Series
c. Induction
d. None of the above
a. Synchronous
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. Synchronous
b. Series
c. Induction
d. None of the above
b. Series
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. Synchronous
b. Series
c. Induction
d. None of the above
c. Induction
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. Contacts
b. Control
c. Switch
d. None of the above
c. Switch
A type of switch having contacts that is operated by magnetism.
a. Push button
b. Relays
c. Motor-starting switch
d. None of the above
b. Relays
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. Motor-starting switch
b. Magnetic-starting switch
c. Reduce-voltage starters
d. None of the above
b. Magnetic-starting switch
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. Motor-starting switch
b. Magnetic-starting switch
c. Reduce-voltage switch
d. None of the above
c. Reduce-voltage switch
This type of control is operated by electricity but it is used to control
the flow of water, oil or gas.
a. Solenoid valve
b. Thermostat
c. Push button
d. None of the above
a. Solenoid valve
Special kind of switch that must open and close automatically in
response to changes in temperature.
a. Thermostat
b. Bellows thermostat
c. Bimetallic thermostat
d. None of the above
a. Thermostat
This thermostat makes use of two unlike metals that do not expand in
the same amount.
a. Water thermostat
b. Bellows thermostat
c. Bimetallic thermostat
d. None of the above
c. Bimetallic thermostat
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
b. Bellows thermostat
c. Bimetallic thermostat
d. None of the above
a. Wafer thermostat
A type of switch has an electric clock that automatically operates switch contacts at definite time intervals.
a. Float switch
b. Pressure switch
c. Time switch
d. Limit switch
e. None of the above
c. Time switch
Type of switch that is useful in farm applications and is desired to limit the travel of rope, chain or carriage.
a. Float switch
b. Pressure switch
c. Time switch
d. Limit switch
e. None of the above
d. Limit switch
An automatic control having switch contacts which are
operated according to various gas or liquid pressure.
a. Float switch
b. Pressure switch
c. Time switch
d. Limit switch
e. None of the above
b. Pressure switch
An invisible agent that produces such effects such light, heat, power, and sound.
a. Lamp
b. Conductor
c. Electricity
d. None of the above
c. Electricity
A mercury lamp with 50-ohms hot resistance is connected to a socket with 240-volt current supply. How
much current is flowing through
the lamp?
a. 0.48 amperes
b. 4.8 amperes
c. 0.48 watt
d. 48 watts
b. 4.8 amperes
I = V/R
= 240 volt/ 50 ohms
= 4.8 amperes
