NCC Practice Test 1

Apprentices typically receive a pay increase after each __

1,000 hours of related work

What is the total resistance of three resistors in parallel with values of 2 ohms, 8 ohms, and 14 ohms?

1.44 ohms

The maximum size dual-element fuse for a 40hp, 3 phase, 460V motor with a design letter D is ___

100A

What is the load center length for a branch circuit with noncontinuous loads of 20A at 60' and 50A at 125'?

106.43 feet

What is the current flow in a purely resistive AC circuit if the resistance is 15 ohms and the voltage is 150V?

10A

If the time for one cycle is 0.1 second, the frequency is __

10Hz

A farm has 3 buildings with loads of 82A, 65A, and 15A. What is the total load? Assume that there are no dwellings or motors.

117 A

Using the VA/linear foot method, the total VA that must be used in a service calculation for a 50' show window is ___

12,500VA (50x200x1.25)

A noncontinuous load of two 120V outlets for heavy-duty lamp holders would have a load of __

1200VA

The minimum ampacity for a feeder supplying ten 30A shore power receptacles in a marina is __

120A

What is the lighting load on a 120V circuit for six 100W incandescent lights and four fluorescent fixtures with a ballast rating of 1.5A, all operating continuously for 8 hours per day?

13.75A

What is the resistance of a light bulb that uses 15 watts of power when placed across a 15 volt battery?

15 ohms

If a store lighting load is 14,000VA (continuous), which of the following must be used for the circuit calculation?

17,500VA

What is the total ampacity for a 120V branch circuit consisting of four duplex receptacles rated noncontinuous duty and six duplex receptacles rated continuous duty?

17.25A

A circuit has a peak voltage of 275V. What is the average voltage value?

175V

The load for 10' of multi-outlet assembly used to supply several loads simultaneously is ___

1800VA

The total resistance of four resistors in parallel with values of 3, 10, 25, and 50 ohms is ___

2.03 ohms

The demand lighting load for a 20,000 sq ft motel with no dining room or ballroom is ___

20,000VA

When making service calculations for multi-family dwellings, additional demand factors must be applied to the portion of the nuetral load greater than ___

200A

According the NEC, the total load of show windows must calculated at not less than ___

200VA per linear foot of show window

What is the adjusted ampacity for each of six NO. 4/0 THHN copper current-carrying conductors in a single conduit? (Given: the ampacity of 4/0 THHN is 260A.)

208A

What is the total load a feeder serving 4 - 2hp motors, 3 - 5hp motors, 1 - 15hp motor, and 1 - 25 hp motor? 208V

219.8 A

Air conditioning overcurrent protective devices can never exceed what percentage of the motor-rated load current or the branch circuit selection current (whichever is greater)?

225%

What is the feeder ampacity for a three-phase, 120/208V subpanel with a connected load of 84,563VA?

235A (84365/(208*1.732))

What is the total load of a feeder serving 4 - 230V motors rated at 5hp, 15hp, 20hp, and 40hp?

241.2 A

OSHA Standards provided specifically for the construction industry are covered in __

29 CFR 1926

What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in the secondary?

2:1

Before it is considered a continuous load, a load must operate for at least how many hours without interruption?

3

The NEC requires that the ampacity of branch circuit conductors be derated when there are more than how many current-carrying conductors in a raceway?

3

NEC Table 220.12 requires a minimum general lighting load for office buildings to be based on ___

3-1/2 VA/ft2

What is the required circuit ampacity of a noncontinuous, single-phase load of 8.5kW at 277V?

30.69A

For resistance welders, the rating for the overcurrent protection device should not exceed what percentage of the primary current rating of the welder?

300%

The smallest size locking and grounding type receptacle that may be used to provide shore power for boats is ___

30A

Use of the 100' tap rule is limited to installation in high-bay manufacturing buildings with wall heights over ___

35 feet

What is the ampacity of a water heater with a nameplate rating of 7,200VA at 240V?

37.5A (7200/240)*125%

What is the total load required by the NEC for the two appliance branch circuits plus a laundry branch circuit?

4,500VA

What is the true power in a 2A series RL circuit with a 100 ohm resistor?

400W

What is the frequency of an AC waveform that completes 20 cycles per half second?

40Hz

What is the current-carrying capacity for No. 6 THWN aluminum conductors in conduit run through an ambient temperature of 38 degrees C?

44A

A 30-microfarad capacitor is in parallel with a 15-microfarad capacitor. The total capacitance is ___

45

What is the feeder load (in VA) for three small appliance branch circuits?

4500VA

Which of the following lighting loads would be used in a residence that is 1650 sq ft?

4950 VA

What is the voltage drop for a 120V, single-phase, two-wire branch circuit, 100' long, using copper conductors of 6530 circular mils with a noncontinuous load of 13A?

5.14V (VD=(2xLxKxI)/CM K=12.9)

The interior lighting load for a school building with a 175,000 sq ft of floor space is ___

525,000VA

When performing load calculations for farm buildings, the load that must be included in the calculation at 100% demand must be at least ___

60A

When space heating equipment uses electric resistance heating elements, protection for the resistance elements must not exceed ___

60A

The total voltage in a circuit with voltage drops of 15V, 25V, and 20V is ___

60V

Calculate the load center length for a 208V, four-wire, three-phase branch circuit with the following noncontinuous loads: 60A at 45' 40A at 60' 30A at 75' 25A at 100'

63.55'

A commercial kitchen with more than six pieces of kitchen equipment is subject to a demand factor of ___

65%

What is the motor full-load current for a motor with a nameplate rating of 50hp, 460V, 3 phase?

65A

What is the demand factor allowed by the NEC for calculatng the neutral conductor size for an electric range load?

70%

What is the load for 40 non-dwelling unit receptacles? (non-continuous)

7200VA (40x180)

If a transformer has 200 turns in the primary, 100 turns in the secondary, and 150VAC applied to the primary, the voltage across the secondary is __

75VAC

Continuous loads are calculated at what percentage of the maximum current rating of the overcurrent device?

80%

The demand load for four pieces of commercial cooking equipment is ___

80%

A sign load cannot exceed ___

80% of the branch circuit rating

What is the demand load for one household range with a nameplate rating of 11.75 kW, 240V, single phase?

8kW

Reactive power is always __

90 degrees out of phase with true power

Calculate the load center length for a branch circuit consisting of the following noncontinuous loads: 125A at 80' 75A at 110' 50A at 100'

93'

Electrical contractors typically employ ___ (this question is ****ing stupid)

E&I Technicians

The statement that total current entering a point must equal total current leaving that point best describes ___

Kirchhoff's current law

The rules governing the design of circuits supplying power to boats is covered in ___

NEC Article 555

An optional method for determining feeder to schools is covered in __

NEC section 220.86

Which of the following describes the standard in NFPA 70E?

Safe work practices must be applied when working on or near exposed energized parts

Why must an arcing device be contained within a special enclosure?

To prevent the ignition of hazardous vapors

The formula for inductive reactance is __

XL=2(pi)fL

A trainee must demonstrate knowledge of the hands-on tasks learned in each module. This is referred to as __

a competency-based program

The power factor can be defined as the ratio of true power to ___

apparent power

The product of the source voltage and the total current is ___

apparent power

If the vector diagram of two AC waveforms is a right angle, then the waves ___

are 90 degrees out of phase

If the phase angles of two sine waves are both 0 degrees, then the waves ___

are in phase

In a circuit that has both capacitance and resistance, the current will lead the voltage ___

by some angle between 0 and 90

To install a raceway system without wasting material, an electrician must be skilled in ___

conduit bending

The self-induced voltage across an inductance is produced by a change in ___

current with the respect to time

When calculating the service requirement for a particular building, the first step is to ___

determine the floor area of the building

An electrician who must know how to disassemble and reassemble magnetic motor starters is a(n) __

electrical maintenance electrician

According to the power triangle, the apparent power is __

greater than the true power

If the area of the plates of a capacitor is increased, the amount of capacitance _____.

increases

Electricians who are responsible for their own taxes and providing their own insurance are considered ___

individual contractors

Opening the secondary circuit of a current transformer under load will cause a dangerous level of ___

induced high voltage

The opposing force that an inductor presents to the flow of alternating current is called ___

inductive reactance

Electricians that work with three-phase power, motors, and motor control systems most likely work in _____.

industrial facilities

Conductors must be derated when installed in conduit ___

on or above rooftops

Before awarding a journeyman certificate, a typical electrical apprenticeship program requires 8,000 total hours of __

on-the-job training

Each of three equal capacitors in series has ___

one-third the applied voltage

One type of nonsinusoidal waveform is the ___

peak wave

Installing nail-on device boxes, panelboards, and lighting fixtures in new houses are tasks performed by ___

residential electricians

Conduit systems in volatile environments must be ___

sealed

A circuit diagram shows that the circuit divides into seperate branches and there are also series loads. This is a ___

series-parallel circuit

According to OSHA standards, your employer must ___

show you how to do each job safely

Electrical licensing requirements are set by _____.

states or municipalities

When the overcurrent protection for a conductor is located on the load end rather than the supply side of a conductor it is considered to be a ___

tap conductor

In most cases, feeder conductor size is adjusted when ___

there are more than three current-carrying conductors in the raceway

A device that uses electromagnetic induction to transfer electrical energy from one circuit to another is a ___

transformer

Transformers in which the primary and secondary voltages are 180 degrees out of phase are known as __

unlike-wound transformers

According to Kirchhoff's voltage law, the total voltage drop in a circuit is equal to the ___

voltage of a power source

In an inductive AC circuit, when the applied voltage is at its maximum negative value, the current is ___

zero