NYC DCAS ELECTRICIAN EXAM QUESTIONS AND VERIFIED
ANSWERS
1. Which electrical quantity is measured in amperes?
• Voltage
■ Current
• Resistance
• Power factor
Answer: Current
2. Ohm's law relates voltage, current, and resistance as which expression?
■V=I×R
•V=I+R
•R=V×I
•I=V×R
Answer: V = I × R
3. Before working on an electrical circuit, what is the safest general practice?
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
• Touch the conductor briefly to test it
• Work energized whenever possible
• Assume a breaker is off without verification
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
4. What is the primary purpose of a circuit breaker?
■ Provide overcurrent protection by interrupting excessive current
• Increase the circuit voltage
• Store electrical energy permanently
• Measure resistance in the circuit
Answer: Provide overcurrent protection by interrupting excessive current
5. Which electrical quantity is measured in amperes What is the best next action?
■ Current
• Resistance
• Power factor
• Voltage
Answer: Current
6. Ohm's law relates voltage, current, and resistance as which expression What is the best next action?
•V=I+R
•R=V×I
•I=V×R
■V=I×R
Answer: V = I × R
7. Before working on an electrical circuit, what is the safest general practice What is the best next action?
• Touch the conductor briefly to test it
, • Work energized whenever possible
• Assume a breaker is off without verification
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
8. What is the primary purpose of a circuit breaker What is the best next action?
• Increase the circuit voltage
• Store electrical energy permanently
• Measure resistance in the circuit
■ Provide overcurrent protection by interrupting excessive current
Answer: Provide overcurrent protection by interrupting excessive current
9. Which electrical quantity is measured in amperes Which choice is most appropriate?
• Resistance
• Power factor
• Voltage
■ Current
Answer: Current
10. Ohm's law relates voltage, current, and resistance as which expression Which choice is most appropriate?
•R=V×I
•I=V×R
■V=I×R
•V=I+R
Answer: V = I × R
11. Before working on an electrical circuit, what is the safest general practice Which choice is most appropriate?
• Work energized whenever possible
• Assume a breaker is off without verification
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
• Touch the conductor briefly to test it
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
12. What is the primary purpose of a circuit breaker Which choice is most appropriate?
• Store electrical energy permanently
• Measure resistance in the circuit
■ Provide overcurrent protection by interrupting excessive current
• Increase the circuit voltage
Answer: Provide overcurrent protection by interrupting excessive current
13. Which electrical quantity is measured in amperes Which statement is most accurate?
• Power factor
• Voltage
■ Current
• Resistance
Answer: Current
14. Ohm's law relates voltage, current, and resistance as which expression Which statement is most accurate?
, •I=V×R
■V=I×R
•V=I+R
•R=V×I
Answer: V = I × R
15. Before working on an electrical circuit, what is the safest general practice Which statement is most accurate?
• Assume a breaker is off without verification
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
• Touch the conductor briefly to test it
• Work energized whenever possible
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
16. What is the primary purpose of a circuit breaker Which statement is most accurate?
• Measure resistance in the circuit
■ Provide overcurrent protection by interrupting excessive current
• Increase the circuit voltage
• Store electrical energy permanently
Answer: Provide overcurrent protection by interrupting excessive current
17. Which electrical quantity is measured in amperes?
• Voltage
■ Current
• Resistance
• Power factor
Answer: Current
18. Ohm's law relates voltage, current, and resistance as which expression?
■V=I×R
•V=I+R
•R=V×I
•I=V×R
Answer: V = I × R
19. Before working on an electrical circuit, what is the safest general practice?
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
• Touch the conductor briefly to test it
• Work energized whenever possible
• Assume a breaker is off without verification
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
20. What is the primary purpose of a circuit breaker?
■ Provide overcurrent protection by interrupting excessive current
• Increase the circuit voltage
• Store electrical energy permanently
• Measure resistance in the circuit
Answer: Provide overcurrent protection by interrupting excessive current
, 21. Which electrical quantity is measured in amperes What is the best next action?
■ Current
• Resistance
• Power factor
• Voltage
Answer: Current
22. Ohm's law relates voltage, current, and resistance as which expression What is the best next action?
•V=I+R
•R=V×I
•I=V×R
■V=I×R
Answer: V = I × R
23. Before working on an electrical circuit, what is the safest general practice What is the best next action?
• Touch the conductor briefly to test it
• Work energized whenever possible
• Assume a breaker is off without verification
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
24. What is the primary purpose of a circuit breaker What is the best next action?
• Increase the circuit voltage
• Store electrical energy permanently
• Measure resistance in the circuit
■ Provide overcurrent protection by interrupting excessive current
Answer: Provide overcurrent protection by interrupting excessive current
25. Which electrical quantity is measured in amperes Which choice is most appropriate?
• Resistance
• Power factor
• Voltage
■ Current
Answer: Current
26. Ohm's law relates voltage, current, and resistance as which expression Which choice is most appropriate?
•R=V×I
•I=V×R
■V=I×R
•V=I+R
Answer: V = I × R
27. Before working on an electrical circuit, what is the safest general practice Which choice is most appropriate?
• Work energized whenever possible
• Assume a breaker is off without verification
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
• Touch the conductor briefly to test it
ANSWERS
1. Which electrical quantity is measured in amperes?
• Voltage
■ Current
• Resistance
• Power factor
Answer: Current
2. Ohm's law relates voltage, current, and resistance as which expression?
■V=I×R
•V=I+R
•R=V×I
•I=V×R
Answer: V = I × R
3. Before working on an electrical circuit, what is the safest general practice?
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
• Touch the conductor briefly to test it
• Work energized whenever possible
• Assume a breaker is off without verification
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
4. What is the primary purpose of a circuit breaker?
■ Provide overcurrent protection by interrupting excessive current
• Increase the circuit voltage
• Store electrical energy permanently
• Measure resistance in the circuit
Answer: Provide overcurrent protection by interrupting excessive current
5. Which electrical quantity is measured in amperes What is the best next action?
■ Current
• Resistance
• Power factor
• Voltage
Answer: Current
6. Ohm's law relates voltage, current, and resistance as which expression What is the best next action?
•V=I+R
•R=V×I
•I=V×R
■V=I×R
Answer: V = I × R
7. Before working on an electrical circuit, what is the safest general practice What is the best next action?
• Touch the conductor briefly to test it
, • Work energized whenever possible
• Assume a breaker is off without verification
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
8. What is the primary purpose of a circuit breaker What is the best next action?
• Increase the circuit voltage
• Store electrical energy permanently
• Measure resistance in the circuit
■ Provide overcurrent protection by interrupting excessive current
Answer: Provide overcurrent protection by interrupting excessive current
9. Which electrical quantity is measured in amperes Which choice is most appropriate?
• Resistance
• Power factor
• Voltage
■ Current
Answer: Current
10. Ohm's law relates voltage, current, and resistance as which expression Which choice is most appropriate?
•R=V×I
•I=V×R
■V=I×R
•V=I+R
Answer: V = I × R
11. Before working on an electrical circuit, what is the safest general practice Which choice is most appropriate?
• Work energized whenever possible
• Assume a breaker is off without verification
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
• Touch the conductor briefly to test it
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
12. What is the primary purpose of a circuit breaker Which choice is most appropriate?
• Store electrical energy permanently
• Measure resistance in the circuit
■ Provide overcurrent protection by interrupting excessive current
• Increase the circuit voltage
Answer: Provide overcurrent protection by interrupting excessive current
13. Which electrical quantity is measured in amperes Which statement is most accurate?
• Power factor
• Voltage
■ Current
• Resistance
Answer: Current
14. Ohm's law relates voltage, current, and resistance as which expression Which statement is most accurate?
, •I=V×R
■V=I×R
•V=I+R
•R=V×I
Answer: V = I × R
15. Before working on an electrical circuit, what is the safest general practice Which statement is most accurate?
• Assume a breaker is off without verification
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
• Touch the conductor briefly to test it
• Work energized whenever possible
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
16. What is the primary purpose of a circuit breaker Which statement is most accurate?
• Measure resistance in the circuit
■ Provide overcurrent protection by interrupting excessive current
• Increase the circuit voltage
• Store electrical energy permanently
Answer: Provide overcurrent protection by interrupting excessive current
17. Which electrical quantity is measured in amperes?
• Voltage
■ Current
• Resistance
• Power factor
Answer: Current
18. Ohm's law relates voltage, current, and resistance as which expression?
■V=I×R
•V=I+R
•R=V×I
•I=V×R
Answer: V = I × R
19. Before working on an electrical circuit, what is the safest general practice?
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
• Touch the conductor briefly to test it
• Work energized whenever possible
• Assume a breaker is off without verification
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
20. What is the primary purpose of a circuit breaker?
■ Provide overcurrent protection by interrupting excessive current
• Increase the circuit voltage
• Store electrical energy permanently
• Measure resistance in the circuit
Answer: Provide overcurrent protection by interrupting excessive current
, 21. Which electrical quantity is measured in amperes What is the best next action?
■ Current
• Resistance
• Power factor
• Voltage
Answer: Current
22. Ohm's law relates voltage, current, and resistance as which expression What is the best next action?
•V=I+R
•R=V×I
•I=V×R
■V=I×R
Answer: V = I × R
23. Before working on an electrical circuit, what is the safest general practice What is the best next action?
• Touch the conductor briefly to test it
• Work energized whenever possible
• Assume a breaker is off without verification
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
Answer: De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
24. What is the primary purpose of a circuit breaker What is the best next action?
• Increase the circuit voltage
• Store electrical energy permanently
• Measure resistance in the circuit
■ Provide overcurrent protection by interrupting excessive current
Answer: Provide overcurrent protection by interrupting excessive current
25. Which electrical quantity is measured in amperes Which choice is most appropriate?
• Resistance
• Power factor
• Voltage
■ Current
Answer: Current
26. Ohm's law relates voltage, current, and resistance as which expression Which choice is most appropriate?
•R=V×I
•I=V×R
■V=I×R
•V=I+R
Answer: V = I × R
27. Before working on an electrical circuit, what is the safest general practice Which choice is most appropriate?
• Work energized whenever possible
• Assume a breaker is off without verification
■ De-energize, lock out/tag out when applicable, and verify absence of voltage with appropriate equipment
• Touch the conductor briefly to test it
