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WorksheetsElectricity Test 3
Total questions: 76
Worksheet time: 38mins
Thermal overload devices operate by magnetism.
True
False
What is it ?
Single Phase Motor
Three Phase Motor
What is it ?
Three Phase Motor
Single Phase Motor
What is it ?
Bi-metal Switch
Capacitor
What is it ?
Capacitor
Coil
What is it ?
Coil (Solenoid)
Disconnect (Power)
What is it ?
Disconnect (Power)
Double Pole - Double Throw Switch (DPDT)
What is it ?
Double Pole - Double Throw Switch (DPDT)
Resistor (Heat Strip)
What is it?
Resistor (Heat Strip)
Fuse
What is it?
Fuse
Fusible Link (Solder Fuse)
What is it ?
Fusible Link (Solder Fuse)
Ground
What is it ?
Ground
Fuse
What is it?
Normally Closed Contacts (NC)
Normally Open Contacts (NO)
What is it?
Normally Open Contacts (NO)
Normally Closed Contacts (NC)
What is it ?
Normally Closed - Open on Rise of Temperature Switch
Normally Open - Close on Rise of Temperature Switch
What is it?
Normally Open - Close on Rise of Temperature Switch
Normally Closed - Open on Rise of Temperature Switch
What is it?
Normally Closed - Open on Rise of Pressure Switch
Normally Open - Close on Rise of Pressure Switch
What is it?
Normally Open - Close on Rise of Pressure Switch
Normally Closed - Open on Rise of Pressure Switch
What is it?
Normally Closed - Open on Time Switch
Normally Open - Close on Time Switch
What is it?
Normally Open - Close on Time Switch
Normally Closed - Open on Time Switch
What is it?
Normally Closed - Open on Rise of Liquid Level Switch
Normally Open - Close on Rise of Liquid Level Switch
What is it?
Normally Open - Close on Rise of Liquid Level Switch
Normally Closed - Open on Rise of Liquid Level Switch
What is it ?
Normally Closed - Open on Increase of Flow Switch
Normally Open - Close on Increase of Flow Switch
What is it ?
Normally Open - Close on Increase of Flow Switch
Normally Closed - Open on Increase of Flow Switch
What is it ?
Single Pole - Single Throw Switch (SPST)
Single Pole - Double Throw Switch (SPDT)
What is it ?
Single Pole - Double Throw Switch (SPDT)
Single Pole - Single Throw Switch (SPST)
What is it ?
Thermal Overload
Thermistor
What is it ?
Thermistor
Thermal Overload
What is it ?
Thermocouple
Transformer Iron Core
What is it ?
Transformer Iron Core
Thermocouple
What is it ?
Variable Resistor
Circuit Breaker
What is it ?
Circuit Breaker
Disconnect (Power)
The electrical source refers to the electrical energy being supplied to equipment.
True
False
The schematic diagram resembles a ladder in that it is made up of two vertical lines representing the incoming electrical sources.
True
False
A packaged air-conditioning unit is manufactured in one piece with all components including the thermostat.
True
False
If the control system is set for heating and the temperature in the structure drops below the set point, the first stage of the heating thermostat opens.
True
False
The schematic wiring diagram uses photos to represent electrical components in the system.
True
False
A heat pump is an air-conditioning system that uses a reversing valve to reverse the refrigeration cycle in order to provide heating.
True
False
The bimetal thermostat derives its name from the fact that it uses three similar metals.
True
False
The transformer for a residential unit is used to convert line voltage to 24 volts.
True
False
Some commercial and industrial high-voltage equipment uses transformers that drop the line voltage to 240 or 120 volts.
True
False
Transformers are 100% efficient.
True
False
Transformers are rated by their primary voltage, secondary voltage, and volt-amperes (VA).
True
False
A high pressure switch will most likely be located where in the refrigeration system?
Evaporator
Suction Line
Gas line
Discharge Line
A low pressure switch will most likely be located where in the refrigeration system?
Condenser Header
Liquid Line
Discharge Line
Suction Line
The transformer in a heating or cooling system provides the low-voltage power source for the control circuit.
True
False
The heat anticipator should be set on the current draw of the primary 24V heating control of the heating circuit. Thus the heating anticipator should be set to the amperage draw of the ___________________________.
Inducer (Combustion) Motor
Gas Valve
Thermostat
Flame Sensor
The line voltage thermostat is usually simpler than its low voltage counterparts because it has less functions to perform.
True
False
Most residential and small commercial installations use a 12-volt control system.
True
False
An alternating current of 60 hertz changes direction 100 times per second.
True
False
The voltage rating of a Start Capacitor can range from ________________.
50 - 600
120 - 300
2 - 80
240 - 500
Magnetism can only be produced by the earth’s core.
True
False
A Six Pole Motor will have an actual speed of ________________.
3450 RPM
1050 RPM
900 RPM
1750 RPM
The microfarad range of a capacitor of a Three Phase Motor has a range of ________________.
3 Phase Motors do not use capacitors
50 - 600
120 - 300
2 - 80
An Eight Pole Motor will have an actual speed of ________________.
900 RPM
1750 RPM
3450 RPM
1050 RPM
The capacitor consists of two aluminum plates with an insulator between them.
True
False
To make an electric motor move continuously, the magnetic field must rotate.
True
False
An alternating current motor’s speed is determined by the frequency of the power supply only.
True
False
Motors are selected mainly because of the starting torque required for the motor to perform its function.
True
False
A Two Pole Motor will have an actual speed of ________________.
3450 RPM
1050 RPM
900 RPM
1750 RPM
A Four Pole Motor will have an actual speed of ________________.
1750 RPM
3450 RPM
1050 RPM
900 RPM
The resistance-start-induction-run motor has only a starting winding.
True
False
The rotation of a shaded-pole motor is from the __________________________.
left to right
right to left
unshaded edge of the pole toward the shaded edge of the pole
shaded edge of the pole toward the unshaded edge of the pole
The voltage rating of a Run Capacitor can range from ________________.
240 - 500
120 - 300
50 - 600
2 - 80
Motor speed is generally used to classify motors into different types.
True
False
A permanent magnet is a piece of magnetic material that has been magnetized and can hold its magnetic strength for a reasonable length of time.
True
False
All magnets have three poles.
True
False
The microfarad rating of a Run Capacitor can range from ________________.
50 - 600
2 - 80
120 - 300
240 - 500
Coil characteristics depend on the type of wire but not the manner in which it is wound.
True
False
Relays cannot be used to open and close a control circuit.
True
False
Fuses cannot be used to protect wires and non-inductive loads, but they provide adequate protection for inductive loads.
True
False
The contactor contacts must be in good condition to ensure that the proper voltage reaches the load.
True
False
Contactors make or break a set of contacts that controls the voltage applied to some load in cooling systems.
True
False
A contactor is used to control an electric load in a control system.
True
False
Contacts are made of silver and cadmium, which resist sticking.
True
False
Contactors are rated by the ampere draw they can carry.
True
False
