Michigan Practice Exam 2017 Flashcards

1
Q

There are 6 conductors in a raceway connected to 75 degree C rated circuit breaker. Each wire has a 70 amp load using THHN. The minimum size conductors used are ________ AWG.

A

4 AWG

310.15(B)(16), 310.15(B)(3)(a)

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2
Q

Thermal insulation shall not be installed within ________ inches of recessed lighting fixtures.

A

3 inches

410.116(B)

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3
Q

A 1” conduit contains three 3-wire circuits or a phase system. All conductors are #10TW. Each circuit consists of two-phase conductors and one grounded conductor and one equipment grounding conductor. The max ampacity of each phase conductor is _____________?

A

24 amps

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4
Q

The volt/ampere rating of a device that consumes 14.5 amperes on a 240 circuit is _________?

A

3,480

VOLTS X AMPERE = VA

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5
Q

A 208 volt, 3 phase heater draws 3,598 watts. How many amperes does the heater draw?

A

10 Amps

P=Ex1.73/I
3598=208x1.73/I
I=3598/359.84

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6
Q

A pool underwater light fixture shall be installed at least _________ inches below the water level?

A

18 inches

680.23(A)(5)

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7
Q

A pools general-purpose receptacle shall not be installed less than ________ feet from inside wall of the pool.

A

6 feet

680.22(A)(1)

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8
Q

The junction box for the 120 volt wet-niche fixture shall be at least?

A

4 inches

680.24(A)(2)(a)

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9
Q

A metal fence installed with-in _______ feet of the pool shall be bonded.

A

5 feet
680.26(B)(7)

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10
Q

The feed to the wet-niche fixture shall be installed in _________ if installed in metal conduit.

A

Brass
680.23(B)(2)

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11
Q

A 15 or 20 amp receptacle shall be located with-in ________ feet of a roof top air conditioner?

A

25 feet, on the same level
210.63

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12
Q

The maximum over current protection for 8 current carrying #12 THHN conductors in a 1/2”EMTconduit is ________ amps.

A

20 amps

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13
Q

An AC system of 50 to 1,000 volts shall be grounded if maximum voltage to ground does not exceed _______ volts.

A

150 Volts
250.20(B)(1)

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14
Q

Type “S” adapters are installed in Edison base fuse holders to _________.

A

To limit the size of the fuse installed.
240.53(B)

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15
Q

A laundry branch circuit shall be rated at ________ amps.

A

20 amps
210.11(c)(2)

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16
Q

In a commercial building the minimum size ungrounded service entrance conductor for 120/240 volt 1 phase 200 amp service is __________.

A

3/0
310.15(B)(2)(a)

17
Q

The minimum service for a one family dwelling shall be ___________.

A

100 amps
230.79(C)

18
Q

Type _______ cable is not permitted for service entrance conductors.

A

UF
340.12(a)

19
Q

A motor rated 4750 watts, 208 volt 3 phase draws _______ amps.

A

13.2amps
I=P/Ex1.73

20
Q

Direct burial cables emerging from the ground and subject to physical damage shall be installed in

A

Schedule 80 PVC
300.5(D)(1-4)

21
Q

A high impedance grounded system is limited to systems operating as ______ volts or above.

A

480 volts
250.36

22
Q

An expansion joint is required for nonmetallic conduit when the temperature changes from r -15 degree to 105 degree Fahrenheit, the thermal expansion for 100 feet or rigid nonmetallic conduit is ________ inches.

A

4.87 inches
Table 352.44
under 120 degree difference

23
Q

The voltage rating of communication cables shall not be less then _______ volts.

A

300 volts
800.179

24
Q

The direction of rotation of a 3 phase motor can be reversed by interchanging any ______ lead.

A

2 leads.

25
Q

A _______ receptacle may be included on the small appliance branch circuit.

A

Electric clock or lighting on a gas range
210.52(B)(2) Exp 1 & 2

26
Q

A light fixture that weights more than _______ pounds shall be supported independently of the fixture junction box.

A

50 lbs
314.27 (A)(2)

27
Q

Disconnecting means shall be provide on the supply side of all cartridge fuses of any voltage where?

A

Accessible to other than qualified persons
240.40

28
Q

Furnaces shall be supplied by a _______ branch circuit.

A

Individual
422.12

29
Q

A screw connecting the neutral bar or a grounded system to the service equipment enclosure is called _______

A

Main bonding jumper
250.28(B)

30
Q

The minimum size rigid metal conduit for a commercial service rated for 150 amps 120/240 volt 3-wire single phase, using THWN wire is ______?

A

1.5
Chapter 9 tables 4 and 5

31
Q

Round boxes shall not be used where conduits or connectors fasten to the _______ of the box.

A