HVAC EXCELLENCE ELECTRICITY FINAL EXAM
QUESTIONS AND ANSWERS RATED A+
✔✔When resistors are wired in parallel; - ✔✔the voltage drop across each resistor will
be the same as the applied source
✔✔Which of the following is equal to 2.1KW? - ✔✔2,100 Watts
✔✔Which of the following is equal to 100 milliamps? - ✔✔0.10 amperes
✔✔A capacitor analyzer is designed to read; - ✔✔the capacitive resistance of a
capacitor.
✔✔On an electronic oil safety switch what changes the pressure singal to electrical
signal? - ✔✔Transducer.
✔✔The electric meter on a house measures the ______________ passing th rough it. -
✔✔wattage
✔✔A three phase load requires a minimum of; - ✔✔three supply lines.
✔✔Which of the following is the correct formula for determining wattage in an electrical
circuit? - ✔✔W = E times I
✔✔A parallel circuit consists of three resistors.R1 = 30 Ohms, R2 = 15 Ohms, R3 = 10
Ohms. If the current through R2 is 4 Amps (I = 4 Amps), what is the source Voltage? -
✔✔60 volts
✔✔Three 300 ohm resistors are wired in parallel. The total resistance equals; - ✔✔100
ohms
✔✔An electronically commutated motor (ECM) is designed to; - ✔✔provide proper air
flow under various conditions.
✔✔Resistance can be calculated by: - ✔✔E divided by I.
✔✔Divided Voltage can be calculated by; - ✔✔I times R
✔✔An ohmmeter should never be connected to; - ✔✔a live circuit or a charged
capacitor until it has been discharged
✔✔Which of the following would be considered an inductive load? - ✔✔electric motor
, ✔✔The voltage to ground of a "high Leg" or "Stinger Leg" on a three phase open Delta
system will be approximately; - ✔✔208
✔✔A transformer has 1000 turns of wire in the primary coil and 500 turns in the
secondary coil. If 120 volts are applied, the output voltage will be. - ✔✔60 volts
✔✔A transformer has 1000 turns of wire in the primary coil and 2000 turns in the
secondary coil. If 120 volts are applied, the output voltage will be; - ✔✔240 volts
✔✔Which of the following is the symbol for Impedance in an AC circuit? - ✔✔Z
✔✔When current flows in a two wire circuit (such as 120 volts) if a clamp on amp meter
is clamped around both wires. What measurement would you expect? - ✔✔Zero amps
due to cancelation of the two fields.
✔✔If the conductor in an AÇ circuit is wound into a coil, the resulting EMF opposes the
supply voltage. This opposition is called. - ✔✔inductive reactance.
✔✔A diode is used to; - ✔✔control the direction of electron flow.
✔✔A ___________ is commonly used on a single phase capacitor start fractional horse
power compressor motor to disconnect the start winding after the motor starts. -
✔✔current relay
✔✔Direction of rotation of a single phase induction motor is determined by. - ✔✔the
direction of current flow through the start winding.
✔✔Single phase motor speed is determined by the. - ✔✔number of stator poles.
✔✔The capacitor start-capacitor run (CSCR) motor provides; - ✔✔high starting and
running torque.
✔✔To change direction of rotation of a three phase motor. - ✔✔change the position of
any two supply wires.
✔✔Capacitors are always connected _____________ to the start winding. - ✔✔in
series
✔✔Which meter is used to bench check a motor for shorts or open windings? -
✔✔ohmmeter.
✔✔A solenoid valve coil operates on the principle of - ✔✔electromagnetism.
QUESTIONS AND ANSWERS RATED A+
✔✔When resistors are wired in parallel; - ✔✔the voltage drop across each resistor will
be the same as the applied source
✔✔Which of the following is equal to 2.1KW? - ✔✔2,100 Watts
✔✔Which of the following is equal to 100 milliamps? - ✔✔0.10 amperes
✔✔A capacitor analyzer is designed to read; - ✔✔the capacitive resistance of a
capacitor.
✔✔On an electronic oil safety switch what changes the pressure singal to electrical
signal? - ✔✔Transducer.
✔✔The electric meter on a house measures the ______________ passing th rough it. -
✔✔wattage
✔✔A three phase load requires a minimum of; - ✔✔three supply lines.
✔✔Which of the following is the correct formula for determining wattage in an electrical
circuit? - ✔✔W = E times I
✔✔A parallel circuit consists of three resistors.R1 = 30 Ohms, R2 = 15 Ohms, R3 = 10
Ohms. If the current through R2 is 4 Amps (I = 4 Amps), what is the source Voltage? -
✔✔60 volts
✔✔Three 300 ohm resistors are wired in parallel. The total resistance equals; - ✔✔100
ohms
✔✔An electronically commutated motor (ECM) is designed to; - ✔✔provide proper air
flow under various conditions.
✔✔Resistance can be calculated by: - ✔✔E divided by I.
✔✔Divided Voltage can be calculated by; - ✔✔I times R
✔✔An ohmmeter should never be connected to; - ✔✔a live circuit or a charged
capacitor until it has been discharged
✔✔Which of the following would be considered an inductive load? - ✔✔electric motor
, ✔✔The voltage to ground of a "high Leg" or "Stinger Leg" on a three phase open Delta
system will be approximately; - ✔✔208
✔✔A transformer has 1000 turns of wire in the primary coil and 500 turns in the
secondary coil. If 120 volts are applied, the output voltage will be. - ✔✔60 volts
✔✔A transformer has 1000 turns of wire in the primary coil and 2000 turns in the
secondary coil. If 120 volts are applied, the output voltage will be; - ✔✔240 volts
✔✔Which of the following is the symbol for Impedance in an AC circuit? - ✔✔Z
✔✔When current flows in a two wire circuit (such as 120 volts) if a clamp on amp meter
is clamped around both wires. What measurement would you expect? - ✔✔Zero amps
due to cancelation of the two fields.
✔✔If the conductor in an AÇ circuit is wound into a coil, the resulting EMF opposes the
supply voltage. This opposition is called. - ✔✔inductive reactance.
✔✔A diode is used to; - ✔✔control the direction of electron flow.
✔✔A ___________ is commonly used on a single phase capacitor start fractional horse
power compressor motor to disconnect the start winding after the motor starts. -
✔✔current relay
✔✔Direction of rotation of a single phase induction motor is determined by. - ✔✔the
direction of current flow through the start winding.
✔✔Single phase motor speed is determined by the. - ✔✔number of stator poles.
✔✔The capacitor start-capacitor run (CSCR) motor provides; - ✔✔high starting and
running torque.
✔✔To change direction of rotation of a three phase motor. - ✔✔change the position of
any two supply wires.
✔✔Capacitors are always connected _____________ to the start winding. - ✔✔in
series
✔✔Which meter is used to bench check a motor for shorts or open windings? -
✔✔ohmmeter.
✔✔A solenoid valve coil operates on the principle of - ✔✔electromagnetism.
