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NCCER Electrical Test Preparation 99 complete solutions., Exams of Electrical Engineering

NCCER Electrical Test Preparation 99 complete solutions. NCCER Electrical Test Preparation 99 complete solutions. NCCER Electrical Test Preparation 99 complete solutions. NCCER Electrical Test Preparation 99 complete solutions. NCCER Electrical Test Preparation 99 complete solutions.

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NCCER Electrical Test Preparation 99
complete solutions.
NCCER Electrical Test Preparation 99
complete solutions.
Article of the NEC covers grounding - ANSWER article 250
90 degree, explosion proof fitting - ANSWER GUAL
Dropout plate - ANSWER Metal plate with a curved surface for cable to follow as it passes from the tray
Common service voltages in the United States EXCEPT - ANSWER 372/575 3-PHASE, 4-WIRE
GFCI breaker - ANSWER Opens a circuit to prevent operation of an electrical device
What happens when one or more coils in a winding are grounded - ANSWER The motor will
automatically blow fuses
Total connected load for eight incandescent lighting fixtures, each 120-volts, with a 200-watt lamp -
ANSWER 13.3 amps
Must be grounded in a bussed gutter if used as the main service equipment - ANSWER Neutral busbar
When wall mounting cable tray, ensure that - ANSWER The building structure is strong enough to
support the tray system
Purpose of sealing cable ends when reels of cable are in storage - ANSWER To keep moisture from
creeping in
Outer covering on liquid-tight flexible metal conduit - ANSWER A moisture seal
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Download NCCER Electrical Test Preparation 99 complete solutions. and more Exams Electrical Engineering in PDF only on Docsity!

complete solutions.

NCCER Electrical Test Preparation 99

complete solutions.

Article of the NEC covers grounding - ANSWER article 250

90 degree, explosion proof fitting - ANSWER GUAL

Dropout plate - ANSWER Metal plate with a curved surface for cable to follow as it passes from the tray

Common service voltages in the United States EXCEPT - ANSWER 372/575 3-PHASE, 4-WIRE

GFCI breaker - ANSWER Opens a circuit to prevent operation of an electrical device

What happens when one or more coils in a winding are grounded - ANSWER The motor will automatically blow fuses

Total connected load for eight incandescent lighting fixtures, each 120-volts, with a 200-watt lamp - ANSWER 13.3 amps

Must be grounded in a bussed gutter if used as the main service equipment - ANSWER Neutral busbar

When wall mounting cable tray, ensure that - ANSWER The building structure is strong enough to support the tray system

Purpose of sealing cable ends when reels of cable are in storage - ANSWER To keep moisture from creeping in

Outer covering on liquid-tight flexible metal conduit - ANSWER A moisture seal

complete solutions.

A good electrical connection should - ANSWER Be mechanically and electrically secure

Symbol normally used for duplex - ANSWER Circle with two parallel lines drawn through it

Disconnecting means are covered in - ANSWER NEC Section 110-

In relation to switches, the term throw refers to - ANSWER Number of internal operations that a switch can perform

A 3-phase, 4-wire, 480v service requires - ANSWER 3 current transformer(s)

Services conductors and equipment are covered in - ANSWER NEC Article 230

All receptacles installed on 25 amp and 20 amp branch circuits must be - ANSWER Grounding receptacles

The circular mil is based on - ANSWER Cross-sectional area of the wire

A transformer with the primary of 400 turns and a secondary of 300 turns has a - ANSWER Step-down turns ratio of 4:

Termination class that provides a seal against external elements - ANSWER Class 1

Calculations in AC circuits unless otherwise noted - ANSWER Rms values

When the coil turns are increased - ANSWER Induced voltage is increased

complete solutions.

Mineral insulated heating cable - ANSWER A type of heating cable that cannot be cut and terminated in the field.

CT under load - ANSWER The secondary should not be opened because of induced high voltage.

Transformer - ANSWER Electromagnetic Induction occurs.

Ground rod installation - ANSWER The top of the rod must be positioned flush with or below grade.

Offset bends - ANSWER The two kicks must be made perfectly parallel or the resulting offset will have a crooked bend.

Condulet as pulling point - ANSWER All types may be used for a 90 degree change in direction, except C.

Grounding system effectiveness - ANSWER Must limit the voltage on the electrical system and protect it from all undervoltage conditions.

Temporary power panel service - ANSWER The MOST common service used is 120/240 volt, 1-phase, 3- wire.

Overcurrent protective devices - ANSWER The 2 MOST common types are circuit breakers and fuses.

Insulation-resistance test instrument - ANSWER A megohmmeter is used to perform an insulation- resistance test on a 480-volt motor winding.

Seal in conduit - ANSWER Installed in a Class I location to prevent the passage of explosive gases in the conduit.

complete solutions.

OHM's law formula - ANSWER The correct formula is I=E/R.

Current transformer principle instrument - ANSWER A clamp-on ammeter operates on the current transformer principle.

Wiring diagram - ANSWER A drawing showing a point A to point B hookup of conductors.

HOA in motor control circuit - ANSWER Usually means Hands of Automatic.

Phase-to-phase voltage at load end - ANSWER For a 120/208 volt feeder with 5% voltage drop, it will be 197.60 volts.

Voltage - ANSWER Electromotive force.

Standard wire size system - ANSWER The standard wire size system used in the United States is AWG.

AL-CU switch - ANSWER Can be used with aluminum copper or copper clad aluminum wire.

Conduit fitting for access - ANSWER A fitting usually placed in the middle of a long run of rigid metal conduit.

Largest size of aluminum rigid conduit couplings - ANSWER 6 inches.

Thermocouple purpose - ANSWER To measure temperature.

Brass-colored terminal on receptacle - ANSWER Indicates it should be used to connect a hot wire.

Standard length of rigid conduit - ANSWER 10 feet.

complete solutions.

Symbol for primary side of a transformer - ANSWER H

Explosion-proof electrical fitting - ANSWER Using an amorphous sealed device

Use of a megger - ANSWER The electrician MUST be sure that the circuit is De-energized and locked, tagged out, and tested

Function of a ballast in a fluorescent fixture - ANSWER Steps up the voltage

Primary purpose of P&ID - ANSWER Provides scale drawings and piping and instrumentation control systems

Factor controlling speed of an induction motor - ANSWER Frequency

Distance between center-to-center bends for a 10-inch offset at 30 degrees - ANSWER 20 inches

Acceptable protection techniques for electrical equipment in hazardous locations - ANSWER Use duct- ignition proof equipment

Purpose of Lockout/Tagout - ANSWER Prevents operation

Equipment to locate a suspected short circuit in 1-phase of a 3-phase motor - ANSWER megger

1 line diagram with simplified symbols - ANSWER Indicates the interconnections and component parts of an electrical circuit

Effect of moisture inside a cadweld mold during welding - ANSWER The cadweld mold could explode

complete solutions.

Result of making 2 equal bends in opposite direction in a conduit run - ANSWER Offset

Unsupported means for cable trays - ANSWER #9 wire

Depths available for 4-inch square boxes - ANSWER 1 inch

Installed at an expansion joint for continuous ground between cable tray sections - ANSWER A bonding jumper

Color identifying insulated, grounded, number 4 conductors - ANSWER Green

Importance of torquing bolts when connecting busbars - ANSWER Decreases resistance on the connection

Protective devices for motors - ANSWER SOLENOID

Sizing of service conductors - ANSWER The total calculated load of the building

Number of complete AC cycles per second - ANSWER Frequency

Component of a dual element fuse - ANSWER Rejection clip

Holding contact in a motor starter - ANSWER Normally connected in parallel with the Start push button

Resistance of a circuit with 480 volts and 50amps - ANSWER 9.6 ohms

How a battery produces voltage - ANSWER Chemical reaction