Journeyman Electrician Practice Test 15

Question 1: A split phase motor should not be used to start heavy loads.

• True
• False

Question 2: The direction of rotation of RI motor cab changed ..............................

• by changing the position of the brushes
• by reversing the two leads of starting and running windings

Question 3: The motor overload device ampere rating should not be less than ............. percentage of the motor full load ampere rating, if the motor is used in homes and on forms.

• 20
• 25
• 30
• 40

Question 4: The service drop wire should maintain clearance of at least ........... from windows.

• 3 ft
• 10 ft
• 2 ft
• 5 ft

Question 5: When a ground rod is used, the ground wire size not be larger than .......................

• No 6
• No 8
• No 10

Question 6: If a 20 amp non motor operated appliance is supplied by a branch circuit what is the maximum ampere rating of a overload device in the circuit?

• 20 amp
• 30 amp
• 25 amp
• 35 amp

Question 7: Which color wire is the mostly used as ground wire?

• red
• black
• green
• white

Question 8: If the current in two current carrying conductors is in opposite direction, which force will exerts in between conductors?

• attractive force
• repulsive force

Question 9: In a D.C Generator, the sparking at brushes occurs due to .....................................

• armature reaction
• reactance voltage in coil
• current reversal in the coil

Question 10: Which of the following is suitable statement to indicate that an electrical transformer cannot be used for DC Power System

• D.C Transformer has high losses compared to A.C Transformer
• DC Voltage Step Up / Step Down is not needed
• Faraday's law of induction is not valid as the rate of change of flux is zero

Question 11: Which of the following is equal to the power factor of an electrical circuit?

• The ratio of true power to apparent power
• The ratio of resistance to impedance
• The ration of voltage to current
• All options are correct

Question 12: What is the minimum size liquid tight flexible metal conduit ( LFMC)  that can be used for general purpose?

• ½ inch
• ¼ inch
• ¾ inch
• 1 inch

NEC Reference: NEC 359.20(A)

Question 13: Which of the following circuits shall not be connected to system containing trolley wires?

• Circuits for lightening
• Grounding wires
• Ungrounded trolley wires
• Bonding wires

NEC Reference: NEC 110.19

Question 14: Which of the following is the smallest size grounded electric conductor for an electric service using 1200 kcmil copper conductor?

• 2/0 copper
• 3/0 copper
• 1/0 copper
• 4 AWG copper

NEC Reference: NEC 250.66

Question 15: What is the highest current rating of plug fuses of Edison base type?

• 30 amperes
• 120 amperes
• 80 amperes
• 50 amperes

NEC Reference: NEC 240.51