TPC 319 ELECTRICAL INSTALLATION EXAM COMPLETE
QUESTIONS AND 100% VERIFIED ANSWERS RECENTLY
UPDATED
300 QUESTIONS AND ANSWERS
1. Q: What is Ohm's Law? A: Ohm's Law states that the current flowing
through a conductor is directly proportional to the voltage across it and
inversely proportional to its resistance. Formula: V = I × R
2. Q: What is the unit of electrical power? A: The unit of electrical power is
the Watt (W).
3. Q: Define electrical current. A: Electrical current is the flow of electric
charge through a conductor, measured in Amperes (A).
4. Q: What is voltage? A: Voltage is the electrical potential difference between
two points, measured in Volts (V).
5. Q: What is resistance? A: Resistance is the opposition to the flow of electric
current, measured in Ohms (Ω).
6. Q: Calculate the current when voltage is 240V and resistance is 60Ω. A:
Using Ohm's Law: I = V/R = 240V/60Ω = 4A
7. Q: What is AC current? A: AC (Alternating Current) is electric current that
periodically reverses direction, commonly used in household electrical systems.
8. Q: What is DC current? A: DC (Direct Current) is electric current that
flows in one direction only, commonly found in batteries and electronic devices.
9. Q: What is the frequency of AC supply in most countries? A: The
frequency is typically 50Hz or 60Hz depending on the country.
10. Q: Define electrical energy. A: Electrical energy is the work done by
electric current over time, measured in kilowatt-hours (kWh).
,11. Q: What is a conductor? A: A conductor is a material that allows electric
current to flow through it easily, such as copper or aluminum.
12. Q: What is an insulator? A: An insulator is a material that resists the flow
of electric current, such as rubber, plastic, or ceramic.
13. Q: What is electrical impedance? A: Impedance is the total opposition to
current flow in an AC circuit, combining resistance and reactance.
14. Q: What is the power formula? A: Power (P) = Voltage (V) × Current (I),
or P = V × I
15. Q: What is Kirchhoff's Current Law? A: The sum of currents entering a
junction equals the sum of currents leaving the junction.
16. Q: What is Kirchhoff's Voltage Law? A: The sum of voltage drops around
any closed loop in a circuit equals zero.
17. Q: What is capacitance? A: Capacitance is the ability to store electrical
charge, measured in Farads (F).
18. Q: What is inductance? A: Inductance is the property of a conductor to
oppose changes in current flow, measured in Henries (H).
19. Q: What is a phase in electrical systems? A: A phase refers to the timing
relationship between voltage and current waveforms in AC circuits.
20. Q: What is three-phase power? A: Three-phase power is an electrical
system using three alternating currents separated by 120 degrees in phase.
21. Q: Calculate power when voltage is 230V and current is 10A. A: P = V ×
I = 230V × 10A = 2300W or 2.3kW
22. Q: What is electrical ground? A: Electrical ground is a reference point for
voltage measurements and a safety connection to earth.
23. Q: What is the purpose of a neutral wire? A: The neutral wire provides a
return path for current in AC circuits and maintains voltage stability.
24. Q: What is apparent power? A: Apparent power is the product of RMS
voltage and RMS current in an AC circuit, measured in volt-amperes (VA).
25. Q: What is reactive power? A: Reactive power is the power that oscillates
between source and load in AC circuits, measured in volt-amperes reactive
(VAR).
26. Q: What is power factor? A: Power factor is the ratio of real power to
apparent power, indicating circuit efficiency.
, 27. Q: What causes voltage drop? A: Voltage drop is caused by the resistance
of conductors carrying current over distance.
28. Q: What is short circuit current? A: Short circuit current is the maximum
current that flows when a fault creates a low-resistance path.
29. Q: What is electrical load? A: Electrical load is any device or component
that consumes electrical power.
30. Q: What is load factor? A: Load factor is the ratio of average load to
maximum load over a specific time period.
31. Q: What is diversity factor? A: Diversity factor is the ratio of sum of
individual maximum demands to the maximum demand of the group.
32. Q: What is demand factor? A: Demand factor is the ratio of maximum
demand to the total connected load.
33. Q: What is utilization factor? A: Utilization factor is the ratio of
maximum demand to the rated capacity of the system.
34. Q: What is electrical energy efficiency? A: Energy efficiency is the ratio
of useful energy output to total energy input.
35. Q: What is harmonic distortion? A: Harmonic distortion is the presence
of frequencies that are multiples of the fundamental frequency.
36. Q: What is RMS value? A: RMS (Root Mean Square) is the effective
value of an AC waveform equivalent to DC for power calculations.
37. Q: What is peak value? A: Peak value is the maximum instantaneous value
of an AC waveform.
38. Q: What is form factor? A: Form factor is the ratio of RMS value to
average value of an AC waveform.
39. Q: What is crest factor? A: Crest factor is the ratio of peak value to RMS
value of an AC waveform.
40. Q: What is electrical resonance? A: Resonance occurs when inductive and
capacitive reactances are equal in an AC circuit.
41. Q: What is eddy current? A: Eddy currents are circular currents induced in
conductors by changing magnetic fields.
42. Q: What is skin effect? A: Skin effect is the tendency of AC current to
flow mainly near the surface of conductors.
QUESTIONS AND 100% VERIFIED ANSWERS RECENTLY
UPDATED
300 QUESTIONS AND ANSWERS
1. Q: What is Ohm's Law? A: Ohm's Law states that the current flowing
through a conductor is directly proportional to the voltage across it and
inversely proportional to its resistance. Formula: V = I × R
2. Q: What is the unit of electrical power? A: The unit of electrical power is
the Watt (W).
3. Q: Define electrical current. A: Electrical current is the flow of electric
charge through a conductor, measured in Amperes (A).
4. Q: What is voltage? A: Voltage is the electrical potential difference between
two points, measured in Volts (V).
5. Q: What is resistance? A: Resistance is the opposition to the flow of electric
current, measured in Ohms (Ω).
6. Q: Calculate the current when voltage is 240V and resistance is 60Ω. A:
Using Ohm's Law: I = V/R = 240V/60Ω = 4A
7. Q: What is AC current? A: AC (Alternating Current) is electric current that
periodically reverses direction, commonly used in household electrical systems.
8. Q: What is DC current? A: DC (Direct Current) is electric current that
flows in one direction only, commonly found in batteries and electronic devices.
9. Q: What is the frequency of AC supply in most countries? A: The
frequency is typically 50Hz or 60Hz depending on the country.
10. Q: Define electrical energy. A: Electrical energy is the work done by
electric current over time, measured in kilowatt-hours (kWh).
,11. Q: What is a conductor? A: A conductor is a material that allows electric
current to flow through it easily, such as copper or aluminum.
12. Q: What is an insulator? A: An insulator is a material that resists the flow
of electric current, such as rubber, plastic, or ceramic.
13. Q: What is electrical impedance? A: Impedance is the total opposition to
current flow in an AC circuit, combining resistance and reactance.
14. Q: What is the power formula? A: Power (P) = Voltage (V) × Current (I),
or P = V × I
15. Q: What is Kirchhoff's Current Law? A: The sum of currents entering a
junction equals the sum of currents leaving the junction.
16. Q: What is Kirchhoff's Voltage Law? A: The sum of voltage drops around
any closed loop in a circuit equals zero.
17. Q: What is capacitance? A: Capacitance is the ability to store electrical
charge, measured in Farads (F).
18. Q: What is inductance? A: Inductance is the property of a conductor to
oppose changes in current flow, measured in Henries (H).
19. Q: What is a phase in electrical systems? A: A phase refers to the timing
relationship between voltage and current waveforms in AC circuits.
20. Q: What is three-phase power? A: Three-phase power is an electrical
system using three alternating currents separated by 120 degrees in phase.
21. Q: Calculate power when voltage is 230V and current is 10A. A: P = V ×
I = 230V × 10A = 2300W or 2.3kW
22. Q: What is electrical ground? A: Electrical ground is a reference point for
voltage measurements and a safety connection to earth.
23. Q: What is the purpose of a neutral wire? A: The neutral wire provides a
return path for current in AC circuits and maintains voltage stability.
24. Q: What is apparent power? A: Apparent power is the product of RMS
voltage and RMS current in an AC circuit, measured in volt-amperes (VA).
25. Q: What is reactive power? A: Reactive power is the power that oscillates
between source and load in AC circuits, measured in volt-amperes reactive
(VAR).
26. Q: What is power factor? A: Power factor is the ratio of real power to
apparent power, indicating circuit efficiency.
, 27. Q: What causes voltage drop? A: Voltage drop is caused by the resistance
of conductors carrying current over distance.
28. Q: What is short circuit current? A: Short circuit current is the maximum
current that flows when a fault creates a low-resistance path.
29. Q: What is electrical load? A: Electrical load is any device or component
that consumes electrical power.
30. Q: What is load factor? A: Load factor is the ratio of average load to
maximum load over a specific time period.
31. Q: What is diversity factor? A: Diversity factor is the ratio of sum of
individual maximum demands to the maximum demand of the group.
32. Q: What is demand factor? A: Demand factor is the ratio of maximum
demand to the total connected load.
33. Q: What is utilization factor? A: Utilization factor is the ratio of
maximum demand to the rated capacity of the system.
34. Q: What is electrical energy efficiency? A: Energy efficiency is the ratio
of useful energy output to total energy input.
35. Q: What is harmonic distortion? A: Harmonic distortion is the presence
of frequencies that are multiples of the fundamental frequency.
36. Q: What is RMS value? A: RMS (Root Mean Square) is the effective
value of an AC waveform equivalent to DC for power calculations.
37. Q: What is peak value? A: Peak value is the maximum instantaneous value
of an AC waveform.
38. Q: What is form factor? A: Form factor is the ratio of RMS value to
average value of an AC waveform.
39. Q: What is crest factor? A: Crest factor is the ratio of peak value to RMS
value of an AC waveform.
40. Q: What is electrical resonance? A: Resonance occurs when inductive and
capacitive reactances are equal in an AC circuit.
41. Q: What is eddy current? A: Eddy currents are circular currents induced in
conductors by changing magnetic fields.
42. Q: What is skin effect? A: Skin effect is the tendency of AC current to
flow mainly near the surface of conductors.
