Journeyman Electrician Practice Test 10

Question 1: In an electrical circuit the power factor is the ratio of apparent power to the actual power.

• True
• False

Question 2: In a parallel electric circuit, which of the electrical quantity is same?

• Voltage
• Current
• Power
• Resistance

Question 3: Which of the following is an enclosed channel specially designed for holding wires, busbars?

• A hose
• A receptacle
• A raceway
• A panel board

Question 4: The lighting outlet installed at or near heating, air-conditioning and refrigeration equipment shall be controlled ………………

• From load side of the HVAC equipment
• By a switch
• By a circuit breaker
• With 20-amperes safety switch

NEC Reference: NEC 210.70(A)(3)

Question 5: A disconnecting means of motors over 600 volts muse be capable of being locked in …………. so that it cannot be inadvertently closed when someone is working on the motor.

• Close position
• Open position
• ON position
• All options are correct

NEC Reference: NEC 430.227

Question 6: Rotating electrical machinery placed in Class II, Division 1 location shall be …………………

• Totally enclosed
• Totally enclosed pipe ventilated
• Totally sealed
• Air ventilated

NEC Reference: NEC 502.125(A)

Question 7: The nameplate rated load current of a hermitic motor compressor is 40 amperes, what is the rating of the over current protective device for a circuit supplying the motor?

• 46 amperes
• 40 amperes
• 50 amperes
• 48 amperes

NEC Reference: NEC 440.12(A)(1)

Question 8: The 240 volts electric circuit consists of feeder and branch circuit, What can be minimum voltmeter reading at receptacle placed at the end of branch circuit?

• 232.8 Volts
• 228 Volts
• 235.2 volts
• 225 volts

Question 9: A 120 volts electrical source is applied to the motor. If the connecting wire has 5% droop what will be the voltmeter indication connected across the motor terminals?

• 120 V
• 114 V
• 116 V
• 110 V

Question 10: The full load current of 3 phase 3 HP continuous duty motor is 50 Amperes with service factor of 1.1. What is its rating of overload separator?

• 50
• 60
• 62.5
• 55

NEC Reference: NEC 430.32(A)(1)

Question 11: The full load current of 3 phase 4 HP continuous duty motor is 60ampers with service factor of 1.1. what is its rating of overload separator?

• 70 amperes
• 65 amperes
• 60 amperes
• 55 amperes

Question 12: If the ends of a 1000 ft length of No.10 AWG Copper wire are connected to 48 V source of electricity. What will be the ampere current that flows in the wire?

• 48 Amperes
• 4.8 Amperes
• 12 Amperes
• 4

Question 13: If a 3 phase 240 Volt 4 MW motor consumes 12 Amperes. What is the power factor of a motor?

• 80 %
• 75 %
• 85 %
• 57 %

Question 14: Five Resistors each with 1 ohm are connected in parallel and 5 ohm resistor is connected in series. What is equivalent resistance of the circuit?

• 5.2 ohms
• 4.8 ohms
• 10 ohms

Question 15: What is resistance offered by 50 W tungsten lamp when 240 Volts is applied to it?

• 1.152 K ohms
• 10.41 ohms
• 0.028 ohms

Question 16: According to NEC 450.13, where must a transformer rated 600V or less be installed?

• In a locked room only
• In a readily accessible location
• Underground only
• Inside the panelboard

NEC Reference: NEC 450.13(A)

Question 17: When sizing branch circuit conductors for a motor, which current value should be used?

• The motor nameplate full-load current
• The NEC table full-load current values
• The locked-rotor current from the nameplate
• The service factor current

NEC Reference: NEC 430.6(A)(1)

Question 18: According to NEC 250.64(A), which of the following materials is permitted for a grounding electrode conductor (GEC)?

• Steel wire only
• Copper, aluminum, or copper-clad aluminum
• Lead wire only
• Copper only

NEC Reference: NEC 250.64(A)

Question 19: A circuit has a resistance of 4 ohms. What is its conductance?

• 4 siemens
• 2 siemens
• 0.25 siemens
• 0.5 siemens

Question 20: For a straight pull in a pull box, the minimum length of the box must not be less than what multiple of the trade diameter of the largest conduit?

• 4 times
• 6 times
• 8 times
• 10 times

NEC Reference: NEC 314.28(A)(1)

Question 21: A motor controller must have a voltage rating .............

• Less than the motor nameplate voltage
• Not less than the circuit voltage
• Equal to 240 volts only
• Equal to the motor horsepower rating

NEC Reference: NEC 430.83(A)(1)

Question 22: How does an AC generator (alternator) produce voltage?

• By using a battery to start current flow
• By rotating a conductor in a magnetic field
• By heating a metal wire
• By applying pressure to a crystal

Question 23: According to NEC 422.30, where must the disconnecting means for an appliance be located?

• At the main service panel only
• Within sight of the appliance, or lockable in open position
• At least 25 feet from the appliance
• In a separate locked room

NEC Reference: NEC 422.30

Question 24: In an AC circuit that contains both resistance (R) and reactance (X), what is the total opposition to current called?

• Resistance
• Reactance
• Impedance
• Conductance

Question 25: NEC 250.52(A)(3) describes a concrete-encased grounding electrode. What is the minimum length of steel reinforcing bar (rebar) required?

• 10 feet
• 15 feet
• 20 feet
• 25 feet

NEC Reference: NEC 250.52(A)(3)

Question 26: How many outdoor receptacle outlets are required for a single family dwelling unit?

• One total
• At least one at front and one at back
• Three — front, back, and garage
• None required outdoors

NEC Reference: NEC 210.52(E)

Question 27: NEC 225.30 generally allows only one feeder or branch circuit to supply a building or structure from an outside source. True or False?

• True
• False

NEC Reference: NEC 225.30

Question 28: Unused openings (knockouts) in panelboards, cabinets, and enclosures must be closed with listed fittings. True or False?

• True
• False

NEC Reference: NEC 408.7

Question 29: NEC 210.8(B) requires GFCI protection for 15 and 20 ampere receptacles in outdoor areas of commercial buildings. True or False?

• True
• False

NEC Reference: NEC 210.8(B)(2)

Question 30: A 3-phase 480-volt motor draws 20 amperes per phase at a power factor of 0.85. What is the real power consumed by the motor?

• 8,160 watts
• 16,627 watts
• 14,148 watts
• 9,600 watts