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TEST 2 MODULE 1 LOAD CALCULATIONS ELECTRICAL 3 WITH COMPLETE SOLUTIONS #22
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TEST 2 MODULE 1 LOAD CALCULATIONS ELECTRICAL 3 WITH COMPLETE SOLUTIONS #22
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TEST 2 MODULE 1 LOAD CALCULATIONS ELECTRICAL 3 WITHCOMPLETE SOLUTIONS #22
A farm installation:
240V
Single-phase
Load #1: 18,000 VA
Load # 2: 16,000 VA -Load # 3: 10,000 VA
Given this information, calculate the total load/net computed load of this farm in
accordance with the NEC.
1. 134.3 amperes
2. 152 amperes
3. 174.3 amperes
14 192 amperes - correct answer 2. 152 amperes
What minimum size type TW copper conductor is required for a non-motor generator
arc welder with a duty cycle of 70% and rated primary current of 50 amperes?
1. 3 AWG
2. 6 AWG
3. 9 AWG
4. 12 AWG - correct answer 2. 6 AWG
Given, a circuit has a source voltage of 120 volts, and a resistive load of 12 Ohms, how
much current will be drawn from the power source?
1. 11.2 amps
2. 11.0 amps
3. 10.2 amps
4. 10.0 amps - correct answer 4. 10.0 amps
What is the calculated demand load in volt-amps off all loads, that is to be added to the
service
Calculation, given the following loads? Use the optional method of calculation, not the
standard.
,- 2,200 sq-ft home
12.0 kw range (240 V)
-5.5 kw dryer
-4.5 kw water heater
-1.5 kw dishwasher
- 9.8 ampere garbage disposal
1. 19,305 VA
2. 20,310 VA
3. 21.305 VA - correct answer 2. 20,310 VA
A transformer:
-Rated at 75kva (75,000VA)
-460V
-Three-phase
-90% efficiency
Given this information, calculate the ampacity (in amperes) for its PRIMARY conductor.
1. 82.4 amperes
2. 94.2 amperes
3. 105.4 amperes
4. 106.2 amperes - correct answer 2. 94.2 amperes
According to the NEC, what would be the minimum size for the secondary conductors of
a 10 kva transformer operating at 480/240 volt single-phase configuration?
1. 8 AWG
2. 10 AWG
3. 12 AWG
4. 14 AWG - correct answer 1. 8 AWG
,What would be minimum ampacity required to supply the following group of motors
running at 208-volts,
Three-phase?
- One (1) 15 HP wound-rotor motor,
Two (2) 7.5 HP squirrel cage motors, -
Three (3) 3 HP squirrel cage motors.
1. 110 amperes
2. 125 amperes
3. 150 amperes
4. 200 amperes - correct answer 3. 150 amperes
If a branch circuit supplies a single non-motor-operated appliance that is marked and
rated at 20A, then the rating of overcurrent protection for the circuit shall not be greater
than how many amperes?
1. 30 amperes
2. 35 amperes
3. 40 amperes
4. 45 amperes - correct answer 1. 30 amperes
Using both Ohm's law and the National Electrical code as a reference for resistance,
calculate the voltage. Drop of the conductors that serve the following circuit load:
- Service: 230 VAC Power: Single-phase
- Load: 5,950 Volt-Amperes - Length: 450 feet (one-way)
- Conductors: 6 AWG
Raceway: Intermediate Metal Conduit
1. 22.50 volts
2. 16.97 volts
3. 11.25 volts
4 5.72 volts - correct answer 3. 11.25 volts
, The allowable ampacity of conductors must be reduced for Ambient Temperature
Correction, and Adjustment Factors, using the derating tables of the National Electrical
Code. Therefore, what would be the maximum conductor ampacity per wire permitted
given the following installation?
- Number of cable pairs: 3
- Number of conductors: Nine - Cable Type: #8-2 with ground
- Insulation Type: THW
- Ambient Temperature: 86 degrees F
1. 40 amperes.
2. 30 amperes.
3. 25 amperes. - correct answer 1. 40 amperes
According to Table 220.55 Note 4, "the branch-circuit load for a counter-mounted
cooking unit (8 kw) and two wall-mounted ovens (7 kw and 8 kw), all supplied from a
single branch circuit and located in the same room, shall be calculated by adding the
nameplate rating of the individual appliances and treating this total as equivalent to one
range." Therefore, what is the demand load in KVA on the service?
1. 32.00 KVA
2. 12.65 kva
3. 8.00 kva
4. 4.40 KVA - correct answer 2. 12.65 KVA
How many 15-amp general lighting branch circuits are required for a 2,576 sq-ft home?
(Was In last exam )
1. 5 circuits
2. 4 circuits
3. 7 circuits
4. 6 circuits - correct answer 1. 5 circuits
What would be the minimum load on a service for a 3,500 sq-ft home? (Included all
required circuits and demand factors by the NEC)
1. 9,300 VA
2. 8,400 VA
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