WorksheetsBasic Electricity Final Exam CC
Total questions: 20
Worksheet time: 10mins
Copper wire sizes are measured in circular mils
True
False
If a conductor carrying electrical current is formed into a coil, the strength of the magnetic field generated by the wire will increase
True
False
If three bulbs are wired in parallel and one bulb burns out, the total current of the circuit will decrease
True
False
To find the watts of electrical power in an electrical circuit, you multiply
Ohms and Amperes
Current and Volts
Volts and Ohms
Volts and Amperes
As loads are added in a parallel circuit, the total resistance of the circuit will decrease.
True
False
What happens to the current in a circuit if the resistance is increased?
The current increase
The current stays the same
The current decreases
None of these
A measure of the quality of electrons flowing past a point in the electrical circuit in a given time
Ohm
Volt
Ampere
Current
What type of charge does an electron have?
Positive
Negative
No charge
Modulating controls are used to ____.
Vary the speed of the motor
Adjust a process.
tends to straighten out with an increase in vapor pressure.
Safety control
Devices, such as thermostats, that open and close their contacts during the ____ operation of the system are referred to as operational controls.
current
De-energized
Energized
Normal
The metals most commonly used in a bimetal temperature control are ____.
Steel and Brass
Brass and Aluminum
Gold and silver
Steel and gold
An example of a bimetal device is a
Rod and Tube
Snap disc
Thermocoupler
All of the Above
A thermocouples is a device that
Converts heat to electrical energy
Is a bimetal
Varies the speed of a motor
produces a voltage across the hot and cold junctions when heated.
Fluid expansion is a way to sense temperature change.
True
False
The purpose of a heat anticipator is to
To wait until the blower is running before the heat turns on
To anticipate when the heat is turning on
To make sure the Indoor fan motor goes on before the heat.
prevents the temperature in the conditioned space from rising above the thermostat setting
What is meant by the term "detent"
Head pressure of the system
Pressure differential switch
Rapid making and breaking of a contact
The cooling contact is open
The heater in the thermostat control circuit in the cooling mode is active when the _
heating contact is open
Cooling contact is open
cooling contact is closed
heating contact is closed
Line voltage thermostats have heavier contacts and use which type of sensing element?
Bimetal
Bellows
Remote bulb
All of them
If the suction pressure of a system is 60 psig and the oil pump outlet is 85 psig, what is the net oil pressure?
145
15
10
25
Where would a water regulating valve that is controlling head pressure be installed?
in the evaporator coil
in the condenser coil
entering the compressor
water circuit at inlet of the condenser
