RCDD/TDMM Chapter 9) Power
Distribution 2025/2026 Exam Questions
and Correct Answers | New Update
Authority having jurisdiction - 🧠 ANSWER ✔✔AHJ
A current flow that alternates periodically (usually sinusoidal) in magnitude
and direction - 🧠 ANSWER ✔✔Alternate Current (ac)
The product of the measured voltage and measured amperage. Expressed
in volt amperes - 🧠 ANSWER ✔✔Apparent Power
A short circuit through the air. When insulation and isolation between
electrified conductors is breached or can no longer withstand the applied
voltage, an arc flash occurs - 🧠 ANSWER ✔✔Arc Flash
American Wire Gauge; the greater the wire diameter, the smaller the AWG
value - 🧠 ANSWER ✔✔AWG
1) The ability of an electronic component to store electrical energy 2) The
opposition to a change in voltage - 🧠 ANSWER ✔✔Capacitance
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,The difference between two values, symbolized with a triangle - 🧠
ANSWER ✔✔Delta
Current flow that has a constant direction. The letters dc are also used to
generically refer to any constant waveform or signal. (EG; a batter voltage
of 3 volts direct current [3Vdc]) - 🧠 ANSWER ✔✔Direct Current (dc)
The number of cycles that a periodic signal completes in a given time. If the
unit of time is one second, the frequency is stated in hertz (Hz). One Hz is
equal to one cycle per second - 🧠 ANSWER ✔✔Frequency
Multiples of the basic frequency of a sine wave (eg the 3rd harmonic of 60
Hz power frequency is 180 Hz) - 🧠 ANSWER ✔✔Harmonics
The total opposition to ac flow, measured in ohms. - 🧠 ANSWER
✔✔Impedance
1) The property of an electric force field built around a conductor when
current flows through it. 2) The resistance to change in current - 🧠
ANSWER ✔✔Inductance
Information Technology Equipment Power; the power consumed by ICT to
manage, monitor, control, process, store, and route data within a data
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
,center, excluding all infrastructure technology equipment - 🧠 ANSWER
✔✔ITE Power
Lockout/ Tagout, a means to protect personnel from the unexpected startup
or re-energization of equipment by ensuring that equipment remains
completely off during routing maintenance and repairs. - 🧠 ANSWER
✔✔LOTO
Low voltage disconnect; a device that is used to disconnect the battery at a
preset voltage during battery discharge and allow reconnection only when
utility power has been restored. Called a 'no volt release' in the UK - 🧠
ANSWER ✔✔LVD
Unwanted electrical signals that were induced onto or superimposed upon
the power line - 🧠 ANSWER ✔✔Noise
Power distribution unit; a device that has a transformer, surge suppression,
single point ground, panelboards, and monitoring under a single enclosure
- 🧠 ANSWER ✔✔PDU
The relationship in time between two waveforms with the same frequency -
🧠 ANSWER ✔✔Phase difference
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
, The number of phases and the type of connection between the utility and
the user - 🧠 ANSWER ✔✔Phase configuration
1) The rate of transfer or absorption of energy per unit time into a system 2)
The energy required to operate an electrical device (EG: Motor, amplifier,
transmitter) - 🧠 ANSWER ✔✔Power
The opposition to the flow of ac current caused by unductance and
capacitance. Expressed in ohms. - 🧠 ANSWER ✔✔Reactance
Providing secondary components that either become instantly operational
or are continuously operational so that the failure of a primary component
will not result in mission failure - 🧠 ANSWER ✔✔Redundancy
A measure of opposition a material offers to the flow of direct current.
Measured in ohms. - 🧠 ANSWER ✔✔Resistance
Remote Power Panel; a power distribution cabinet downstream from a PDU
or UPS, typically containing circuits or breakers, without a transformer
located near the load. - 🧠 ANSWER ✔✔RPP
Safety Data Sheet; a document prepared by the manufacturer describing
all known chemical, radiological, and other hazards of a specific product.
Formerly called a material safety data sheet (MSDS) - 🧠 ANSWER ✔✔SDS
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
4
Distribution 2025/2026 Exam Questions
and Correct Answers | New Update
Authority having jurisdiction - 🧠 ANSWER ✔✔AHJ
A current flow that alternates periodically (usually sinusoidal) in magnitude
and direction - 🧠 ANSWER ✔✔Alternate Current (ac)
The product of the measured voltage and measured amperage. Expressed
in volt amperes - 🧠 ANSWER ✔✔Apparent Power
A short circuit through the air. When insulation and isolation between
electrified conductors is breached or can no longer withstand the applied
voltage, an arc flash occurs - 🧠 ANSWER ✔✔Arc Flash
American Wire Gauge; the greater the wire diameter, the smaller the AWG
value - 🧠 ANSWER ✔✔AWG
1) The ability of an electronic component to store electrical energy 2) The
opposition to a change in voltage - 🧠 ANSWER ✔✔Capacitance
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,The difference between two values, symbolized with a triangle - 🧠
ANSWER ✔✔Delta
Current flow that has a constant direction. The letters dc are also used to
generically refer to any constant waveform or signal. (EG; a batter voltage
of 3 volts direct current [3Vdc]) - 🧠 ANSWER ✔✔Direct Current (dc)
The number of cycles that a periodic signal completes in a given time. If the
unit of time is one second, the frequency is stated in hertz (Hz). One Hz is
equal to one cycle per second - 🧠 ANSWER ✔✔Frequency
Multiples of the basic frequency of a sine wave (eg the 3rd harmonic of 60
Hz power frequency is 180 Hz) - 🧠 ANSWER ✔✔Harmonics
The total opposition to ac flow, measured in ohms. - 🧠 ANSWER
✔✔Impedance
1) The property of an electric force field built around a conductor when
current flows through it. 2) The resistance to change in current - 🧠
ANSWER ✔✔Inductance
Information Technology Equipment Power; the power consumed by ICT to
manage, monitor, control, process, store, and route data within a data
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
,center, excluding all infrastructure technology equipment - 🧠 ANSWER
✔✔ITE Power
Lockout/ Tagout, a means to protect personnel from the unexpected startup
or re-energization of equipment by ensuring that equipment remains
completely off during routing maintenance and repairs. - 🧠 ANSWER
✔✔LOTO
Low voltage disconnect; a device that is used to disconnect the battery at a
preset voltage during battery discharge and allow reconnection only when
utility power has been restored. Called a 'no volt release' in the UK - 🧠
ANSWER ✔✔LVD
Unwanted electrical signals that were induced onto or superimposed upon
the power line - 🧠 ANSWER ✔✔Noise
Power distribution unit; a device that has a transformer, surge suppression,
single point ground, panelboards, and monitoring under a single enclosure
- 🧠 ANSWER ✔✔PDU
The relationship in time between two waveforms with the same frequency -
🧠 ANSWER ✔✔Phase difference
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
, The number of phases and the type of connection between the utility and
the user - 🧠 ANSWER ✔✔Phase configuration
1) The rate of transfer or absorption of energy per unit time into a system 2)
The energy required to operate an electrical device (EG: Motor, amplifier,
transmitter) - 🧠 ANSWER ✔✔Power
The opposition to the flow of ac current caused by unductance and
capacitance. Expressed in ohms. - 🧠 ANSWER ✔✔Reactance
Providing secondary components that either become instantly operational
or are continuously operational so that the failure of a primary component
will not result in mission failure - 🧠 ANSWER ✔✔Redundancy
A measure of opposition a material offers to the flow of direct current.
Measured in ohms. - 🧠 ANSWER ✔✔Resistance
Remote Power Panel; a power distribution cabinet downstream from a PDU
or UPS, typically containing circuits or breakers, without a transformer
located near the load. - 🧠 ANSWER ✔✔RPP
Safety Data Sheet; a document prepared by the manufacturer describing
all known chemical, radiological, and other hazards of a specific product.
Formerly called a material safety data sheet (MSDS) - 🧠 ANSWER ✔✔SDS
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
4
