1. What is the SI unit of electrical resistance?
• A) Ampere
• B) Volt
• C) Ohm
• D) Watt ANSWER : C) Ohm
2. Ohm's Law states that voltage equals:
• A) Current divided by resistance
• B) Current multiplied by resistance
• C) Resistance divided by current
• D) Power multiplied by current ANSWER : B) Current multiplied by
resistance
3. What is the frequency of standard AC power in North America?
• A) 50 Hz
• B) 60 Hz
• C) 100 Hz
• D) 120 Hz ANSWER : B) 60 Hz
4. What does DC stand for in electrical terms?
• A) Direct Current
• B) Digital Circuit
• C) Dual Conductor
• D) Dynamic Current ANSWER : A) Direct Current
5. The power in a DC circuit is calculated as:
• A) V × I
• B) V ÷ I
• C) I ÷ V
• D) V + I ANSWER : A) V × I
6. What is the unit of electrical power?
, • A) Joule
• B) Watt
• C) Ampere
• D) Ohm ANSWER : B) Watt
7. What is the relationship between kW and W?
• A) 1 kW = 10 W
• B) 1 kW = 100 W
• C) 1 kW = 1000 W
• D) 1 kW = 10000 W ANSWER : C) 1 kW = 1000 W
8. In a series circuit, the total resistance is:
• A) The average of all resistances
• B) The sum of all resistances
• C) The product of all resistances
• D) The lowest resistance value ANSWER : B) The sum of all
resistances
9. What is the typical voltage rating for low voltage systems?
• A) Below 50V
• B) Below 100V
• C) Below 600V
• D) Below 1000V ANSWER : D) Below 1000V
10. What does NEMA stand for?
• A) National Equipment Manufacturers Association
• B) National Electrical Manufacturers Association
• C) New Equipment Manufacturing Alliance
• D) National Energy Management Association ANSWER : B) National
Electrical Manufacturers Association
11. The insulation resistance test is performed using:
• A) Ohmmeter
• B) Megohmmeter
• C) Ammeter
• D) Voltmeter ANSWER : B) Megohmmeter
12. What is the purpose of grounding in electrical systems?
, • A) To increase voltage
• B) To provide a safe path for fault current
• C) To reduce power consumption
• D) To improve efficiency ANSWER : B) To provide a safe path for
fault current
13. TheColor code for ground wire in the US is:
• A) Black
• B) White
• C) Green or bare
• D) Red ANSWER : C) Green or bare
14. What does IP rating indicate?
• A) Internal Power
• B) Ingress Protection
• C) Industrial Performance
• D) Insulation Protection ANSWER : B) Ingress Protection
15. An IP65 rating indicates protection against:
• A) Water spray
• B) Dust and water jets
• C) Temporary immersion
• D) Moisture only ANSWER : B) Dust and water jets
16. What is the standard voltage for residential outlets in the US?
• A) 110V
• B) 120V
• C) 220V
• D) 240V ANSWER : B) 120V
17. A transformer is used to:
• A) Convert AC to DC
• B) Change voltage levels
• C) Measure current
• D) Store electrical energy ANSWER : B) Change voltage levels
18. The ratio of output power to input power is called:
• A) Power factor
, • B) Efficiency
• C) Load factor
• D) Demand factor ANSWER : B) Efficiency
19. What is the unit of electrical energy?
• A) Watt
• B) Joule or Watt-hour
• C) Ampere
• D) Volt ANSWER : B) Joule or Watt-hour
20. In a three-phase system, phases are separated by:
• A) 90 degrees
• B) 120 degrees
• C) 180 degrees
• D) 360 degrees ANSWER : B) 120 degrees
21. What does RMS stand for in AC measurements?
• A) Real Maximum Signal
• B) Root Mean Square
• C) Rated Minimum Standard
• D) Resistance Measurement System ANSWER : B) Root Mean Square
22. The neutral wire typically carries:
• A) No current
• B) Return current
• C) Only fault current
• D) Ground current ANSWER : B) Return current
23. Electrical power is measured in:
• A) Amperes
• B) Volts
• C) Watts
• D) Ohms ANSWER : C) Watts
24. What is the purpose of a circuit breaker?
• A) To measure current
• B) To protect against overcurrent
• C) To step down voltage
• A) Ampere
• B) Volt
• C) Ohm
• D) Watt ANSWER : C) Ohm
2. Ohm's Law states that voltage equals:
• A) Current divided by resistance
• B) Current multiplied by resistance
• C) Resistance divided by current
• D) Power multiplied by current ANSWER : B) Current multiplied by
resistance
3. What is the frequency of standard AC power in North America?
• A) 50 Hz
• B) 60 Hz
• C) 100 Hz
• D) 120 Hz ANSWER : B) 60 Hz
4. What does DC stand for in electrical terms?
• A) Direct Current
• B) Digital Circuit
• C) Dual Conductor
• D) Dynamic Current ANSWER : A) Direct Current
5. The power in a DC circuit is calculated as:
• A) V × I
• B) V ÷ I
• C) I ÷ V
• D) V + I ANSWER : A) V × I
6. What is the unit of electrical power?
, • A) Joule
• B) Watt
• C) Ampere
• D) Ohm ANSWER : B) Watt
7. What is the relationship between kW and W?
• A) 1 kW = 10 W
• B) 1 kW = 100 W
• C) 1 kW = 1000 W
• D) 1 kW = 10000 W ANSWER : C) 1 kW = 1000 W
8. In a series circuit, the total resistance is:
• A) The average of all resistances
• B) The sum of all resistances
• C) The product of all resistances
• D) The lowest resistance value ANSWER : B) The sum of all
resistances
9. What is the typical voltage rating for low voltage systems?
• A) Below 50V
• B) Below 100V
• C) Below 600V
• D) Below 1000V ANSWER : D) Below 1000V
10. What does NEMA stand for?
• A) National Equipment Manufacturers Association
• B) National Electrical Manufacturers Association
• C) New Equipment Manufacturing Alliance
• D) National Energy Management Association ANSWER : B) National
Electrical Manufacturers Association
11. The insulation resistance test is performed using:
• A) Ohmmeter
• B) Megohmmeter
• C) Ammeter
• D) Voltmeter ANSWER : B) Megohmmeter
12. What is the purpose of grounding in electrical systems?
, • A) To increase voltage
• B) To provide a safe path for fault current
• C) To reduce power consumption
• D) To improve efficiency ANSWER : B) To provide a safe path for
fault current
13. TheColor code for ground wire in the US is:
• A) Black
• B) White
• C) Green or bare
• D) Red ANSWER : C) Green or bare
14. What does IP rating indicate?
• A) Internal Power
• B) Ingress Protection
• C) Industrial Performance
• D) Insulation Protection ANSWER : B) Ingress Protection
15. An IP65 rating indicates protection against:
• A) Water spray
• B) Dust and water jets
• C) Temporary immersion
• D) Moisture only ANSWER : B) Dust and water jets
16. What is the standard voltage for residential outlets in the US?
• A) 110V
• B) 120V
• C) 220V
• D) 240V ANSWER : B) 120V
17. A transformer is used to:
• A) Convert AC to DC
• B) Change voltage levels
• C) Measure current
• D) Store electrical energy ANSWER : B) Change voltage levels
18. The ratio of output power to input power is called:
• A) Power factor
, • B) Efficiency
• C) Load factor
• D) Demand factor ANSWER : B) Efficiency
19. What is the unit of electrical energy?
• A) Watt
• B) Joule or Watt-hour
• C) Ampere
• D) Volt ANSWER : B) Joule or Watt-hour
20. In a three-phase system, phases are separated by:
• A) 90 degrees
• B) 120 degrees
• C) 180 degrees
• D) 360 degrees ANSWER : B) 120 degrees
21. What does RMS stand for in AC measurements?
• A) Real Maximum Signal
• B) Root Mean Square
• C) Rated Minimum Standard
• D) Resistance Measurement System ANSWER : B) Root Mean Square
22. The neutral wire typically carries:
• A) No current
• B) Return current
• C) Only fault current
• D) Ground current ANSWER : B) Return current
23. Electrical power is measured in:
• A) Amperes
• B) Volts
• C) Watts
• D) Ohms ANSWER : C) Watts
24. What is the purpose of a circuit breaker?
• A) To measure current
• B) To protect against overcurrent
• C) To step down voltage
