Journeyman Electrician Practice Test 10

Question 1: 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 2: 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 3: 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 4: 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 5: 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 6: In a parallel electric circuit, which of the electrical quantity is same?

• Voltage
• Current
• Power
• Resistance

Question 7: 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 8: In an electrical circuit the power factor is the ratio of apparent power to the actual power.

• True
• False

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

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

Question 12: The lightening 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 13: 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 14: 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 15: 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)