ETCP Portable Power Distribution
Technician Practice Exam 100
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A Instant Download Pdf
Section 1: Electrical Theory and Calculations
1. What is the standard voltage for a single-phase temporary power system
in North America?
A. 120/208V
B. 120/240V
C. 277/480V
D. 347/600V
B. 120/240V
Single-phase temporary power typically uses 120/240V for standard outlets
and equipment, providing both 120V for branch circuits and 240V for higher-
load single-phase equipment.
2. Ohm's Law states that voltage equals:
A. Current divided by resistance
B. Current times resistance
C. Resistance divided by current
D. Power divided by current
B. Current times resistance
Ohm's Law is expressed as V = IR, where V is voltage, I is current in amperes,
and R is resistance in ohms.
, 3. In a 208Y/120V three-phase system, what is the line-to-neutral voltage?
A. 208V
B. 120V
C. 240V
D. 480V
B. 120V
In a 208Y/120V wye system, the line-to-line voltage is 208V, and the line-to-
neutral voltage is 208 ÷ √3 ≈ 120V.
4. What is the formula for calculating power in a single-phase AC circuit?
A. P = I²R only
B. P = VI only
C. P = VI × power factor
D. P = V/R
C. P = VI × power factor
Single-phase AC power is calculated as P = VI × PF, where PF accounts for the
phase difference between voltage and current in reactive loads.
5. Three-phase power has phases separated by how many electrical
degrees?
A. 90 degrees
B. 120 degrees
C. 180 degrees
D. 360 degrees
B. 120 degrees
The three phases of a balanced three-phase system are electrically separated
by 120 degrees, providing constant power delivery.
6. A portable generator produces what type of current?
A. Direct current (DC)
B. Alternating current (AC)
C. Pulsed DC
D. Static
B. Alternating current (AC)
, Most portable generators used in entertainment applications produce
alternating current (AC), typically at 60 Hz in North America.
7. What is ampacity?
A. The voltage capacity of a conductor
B. The maximum current a conductor can carry safely
C. The resistance value of a conductor
D. The frequency limit of a circuit
B. The maximum current a conductor can carry safely
Ampacity defines the safe current-carrying capacity of a conductor without
exceeding its temperature rating.
8. Which instrument is used to measure electrical resistance?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
C. Ohmmeter
An ohmmeter is specifically designed to measure resistance in an electrical
circuit.
9. Which device measures current without breaking the circuit?
A. Clamp meter
B. Ohmmeter
C. Megger
D. Voltage tester
A. Clamp meter
Clamp meters measure current through induction, allowing non-contact
measurement without disconnecting conductors.
10.What is voltage drop?
A. An increase in circuit voltage
B. A reduction in voltage caused by circuit impedance and current flow
C. A frequency increase
D. A grounding method
Technician Practice Exam 100
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A Instant Download Pdf
Section 1: Electrical Theory and Calculations
1. What is the standard voltage for a single-phase temporary power system
in North America?
A. 120/208V
B. 120/240V
C. 277/480V
D. 347/600V
B. 120/240V
Single-phase temporary power typically uses 120/240V for standard outlets
and equipment, providing both 120V for branch circuits and 240V for higher-
load single-phase equipment.
2. Ohm's Law states that voltage equals:
A. Current divided by resistance
B. Current times resistance
C. Resistance divided by current
D. Power divided by current
B. Current times resistance
Ohm's Law is expressed as V = IR, where V is voltage, I is current in amperes,
and R is resistance in ohms.
, 3. In a 208Y/120V three-phase system, what is the line-to-neutral voltage?
A. 208V
B. 120V
C. 240V
D. 480V
B. 120V
In a 208Y/120V wye system, the line-to-line voltage is 208V, and the line-to-
neutral voltage is 208 ÷ √3 ≈ 120V.
4. What is the formula for calculating power in a single-phase AC circuit?
A. P = I²R only
B. P = VI only
C. P = VI × power factor
D. P = V/R
C. P = VI × power factor
Single-phase AC power is calculated as P = VI × PF, where PF accounts for the
phase difference between voltage and current in reactive loads.
5. Three-phase power has phases separated by how many electrical
degrees?
A. 90 degrees
B. 120 degrees
C. 180 degrees
D. 360 degrees
B. 120 degrees
The three phases of a balanced three-phase system are electrically separated
by 120 degrees, providing constant power delivery.
6. A portable generator produces what type of current?
A. Direct current (DC)
B. Alternating current (AC)
C. Pulsed DC
D. Static
B. Alternating current (AC)
, Most portable generators used in entertainment applications produce
alternating current (AC), typically at 60 Hz in North America.
7. What is ampacity?
A. The voltage capacity of a conductor
B. The maximum current a conductor can carry safely
C. The resistance value of a conductor
D. The frequency limit of a circuit
B. The maximum current a conductor can carry safely
Ampacity defines the safe current-carrying capacity of a conductor without
exceeding its temperature rating.
8. Which instrument is used to measure electrical resistance?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
C. Ohmmeter
An ohmmeter is specifically designed to measure resistance in an electrical
circuit.
9. Which device measures current without breaking the circuit?
A. Clamp meter
B. Ohmmeter
C. Megger
D. Voltage tester
A. Clamp meter
Clamp meters measure current through induction, allowing non-contact
measurement without disconnecting conductors.
10.What is voltage drop?
A. An increase in circuit voltage
B. A reduction in voltage caused by circuit impedance and current flow
C. A frequency increase
D. A grounding method
