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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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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
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
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.
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.
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
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