Test 2 Objective Assessment
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Calculate the minimum size of the branch circuit conductors to source a motor
given the following
conditions: Operating Voltage: 480 volts.
Electric Power: Three Phase
- Motor Horsepower: 40 HP - Nameplate Rating: 50 amperes - Duty-Cycle
Service: 15 minute, Intermittent duty
1. 12 AWG.
2. 6 AWG.
3. 4 AWG.
4. 3 AWG. - ANSWER ✓ 2. 6 AWG
According to the National Electrical Code, what would be the calculated minimum
trade size equipment grounding conductor required to protect one 5 HP, 208 V, 3-
phase motor? Consider all the exceptions for rating or setting for individual motor
circuits, and the use of an instantaneous trip breaker.
1. 2 AWG
2. 3 AWG
3. 4 AWG
,4. 6 AWG - ANSWER ✓ 4. 6 AWG
A 15-minute rated, 115 V, 2 HP, 3 phase squirrel-cage motor is to be used for
intermittent duty. The
minimum allowable ampacity of the branch-circuit conductors serving the motor is
1. 11.6 amps
2. 13.6 amps
3. 16.0 amps
4. 20.4 amps - ANSWER ✓ 1. 11.6 amps
Given. A circuit load draws a total of 48 amperes, the resistive load on the circuit
is 5 Ohms, determine
source voltage for this circuit.
1. 120 volts
2. 240 volts
3. 277 volts
4. 480 volts - ANSWER ✓ 2. 240 volts
Using the optional method described in Article 220 of the NEC, what is the
smallest feeder that can supply a multi-family building, given it has 60 units, with
a 4,000 watt dryer in each unit?
1. 50 kW
2. 75 kW
3. 277 KW
,4. 300 kW - ANSWER ✓ 2. 75 kw
The minimum allowable radius of the inner edge of a bend in mineral insulated
metal-sheathed cable is
1. 2-1/2 in. for a 1/2-in. cable
2. 6 in. for a 1-in. cable.
3. 7 in. for a 1-in. cable :
4. 7 in. for a 1/2-in. cable. - ANSWER ✓ 1. 2-1/2 in. For a 1/2 - in cable
A controller (contactor) has been installed to control an automatically started one
horsepower motor with a marked service factor of 1.15. The motor nameplate full-
load current rating is 8.8 amperes. What is the maximum size overload device that
may be installed in this controller?
1. 10.1 amperes
2. 11.0 amperes
3. 11.8 amperes
4. 12.3 amperes - ANSWER ✓ 2. 11.0 amperes
What would be the minimum required branch circuit for a combined equipment
load of the following?
- One, 7,000 watt range top - One, 8,000 watt wall-mounted oven
1. 8 kW
2. 15 kW
3. 12 kW
4. 9.2 kW - ANSWER ✓ 4. 9.2 kw
, Given an office building plan that consists of 25,000 sq-ft, with no receptacles
displayed on the plan.
Calculate the demand load of the receptacles.
1. 22.5 kW
2. 23.25 kW
3. 25.0 kW
4. 28.5 kW - ANSWER ✓ 3. 25.0 kw
A fixed storage-type water heater that has a capacity of 120 gal or less shall be
considered a continuous load for the purposes of sizing branch circuits. Therefore,
if the heater has an element with a nameplate. rating of 6kW at 240-vac single-
phase, what would be the minimum fuse or breaker size to protect this circuit?
1. 40
2. 35
3. 30
4. 20. - ANSWER ✓ 2. 35
What is the secondary current of a single phase, step-up transformer if the primary
voltage is 120 volts, the secondary voltage is 600 volts, and the primary current is
10 amperes? (Assume no transformer
impedance)
1. 2 amperes
2. 5 amperes
3. 10 amperes
4. 50 amperes - ANSWER ✓ 1. 2 amperes
Complete frequently TESTED Exam
Questions with Definitive Correct
Answers A+ Graded!!100%
Guaranteed Pass!!<<Latest
Version>>
Calculate the minimum size of the branch circuit conductors to source a motor
given the following
conditions: Operating Voltage: 480 volts.
Electric Power: Three Phase
- Motor Horsepower: 40 HP - Nameplate Rating: 50 amperes - Duty-Cycle
Service: 15 minute, Intermittent duty
1. 12 AWG.
2. 6 AWG.
3. 4 AWG.
4. 3 AWG. - ANSWER ✓ 2. 6 AWG
According to the National Electrical Code, what would be the calculated minimum
trade size equipment grounding conductor required to protect one 5 HP, 208 V, 3-
phase motor? Consider all the exceptions for rating or setting for individual motor
circuits, and the use of an instantaneous trip breaker.
1. 2 AWG
2. 3 AWG
3. 4 AWG
,4. 6 AWG - ANSWER ✓ 4. 6 AWG
A 15-minute rated, 115 V, 2 HP, 3 phase squirrel-cage motor is to be used for
intermittent duty. The
minimum allowable ampacity of the branch-circuit conductors serving the motor is
1. 11.6 amps
2. 13.6 amps
3. 16.0 amps
4. 20.4 amps - ANSWER ✓ 1. 11.6 amps
Given. A circuit load draws a total of 48 amperes, the resistive load on the circuit
is 5 Ohms, determine
source voltage for this circuit.
1. 120 volts
2. 240 volts
3. 277 volts
4. 480 volts - ANSWER ✓ 2. 240 volts
Using the optional method described in Article 220 of the NEC, what is the
smallest feeder that can supply a multi-family building, given it has 60 units, with
a 4,000 watt dryer in each unit?
1. 50 kW
2. 75 kW
3. 277 KW
,4. 300 kW - ANSWER ✓ 2. 75 kw
The minimum allowable radius of the inner edge of a bend in mineral insulated
metal-sheathed cable is
1. 2-1/2 in. for a 1/2-in. cable
2. 6 in. for a 1-in. cable.
3. 7 in. for a 1-in. cable :
4. 7 in. for a 1/2-in. cable. - ANSWER ✓ 1. 2-1/2 in. For a 1/2 - in cable
A controller (contactor) has been installed to control an automatically started one
horsepower motor with a marked service factor of 1.15. The motor nameplate full-
load current rating is 8.8 amperes. What is the maximum size overload device that
may be installed in this controller?
1. 10.1 amperes
2. 11.0 amperes
3. 11.8 amperes
4. 12.3 amperes - ANSWER ✓ 2. 11.0 amperes
What would be the minimum required branch circuit for a combined equipment
load of the following?
- One, 7,000 watt range top - One, 8,000 watt wall-mounted oven
1. 8 kW
2. 15 kW
3. 12 kW
4. 9.2 kW - ANSWER ✓ 4. 9.2 kw
, Given an office building plan that consists of 25,000 sq-ft, with no receptacles
displayed on the plan.
Calculate the demand load of the receptacles.
1. 22.5 kW
2. 23.25 kW
3. 25.0 kW
4. 28.5 kW - ANSWER ✓ 3. 25.0 kw
A fixed storage-type water heater that has a capacity of 120 gal or less shall be
considered a continuous load for the purposes of sizing branch circuits. Therefore,
if the heater has an element with a nameplate. rating of 6kW at 240-vac single-
phase, what would be the minimum fuse or breaker size to protect this circuit?
1. 40
2. 35
3. 30
4. 20. - ANSWER ✓ 2. 35
What is the secondary current of a single phase, step-up transformer if the primary
voltage is 120 volts, the secondary voltage is 600 volts, and the primary current is
10 amperes? (Assume no transformer
impedance)
1. 2 amperes
2. 5 amperes
3. 10 amperes
4. 50 amperes - ANSWER ✓ 1. 2 amperes
