1. A circuit with zero resistance is called a:
A. Closed circuit
B. Open circuit
C. Short circuit
D. Parallel circuit
Answer: C) Short circuit
Rationale: A short circuit occurs when resistance is negligible, leading
to excessive current flow.
2. Which formula represents electrical resistance?
A. R = V/I
B. R = VI
C. R = P/V
D. R = I/V
Answer: A) R = V/I
Rationale: Resistance is calculated as voltage divided by current.
3. In a DC circuit, the direction of current flow is:
A. Alternating
B. Constant
,C. Reversing periodically
D. Varying with frequency
Answer: B) Constant
Rationale: In a direct current (DC) circuit, current flows consistently in
one direction.
4. The role of a rectifier in an electrical circuit is to:
A. Increase voltage
B. Convert AC to DC
C. Reduce current
D. Store energy
Answer: B) Convert AC to DC
Rationale: Rectifiers convert alternating current (AC) to direct current
(DC).
5. Which type of conduit is best suited for outdoor use?
A. EMT
B. PVC
C. FMC
D. AC
Answer: B) PVC
, Rationale: PVC conduit is corrosion-resistant and suitable for outdoor
environments.
6. What is the purpose of a circuit breaker?
A. Measure current
B. Control resistance
C. Prevent overloads and short circuits
D. Increase voltage
Answer: C) Prevent overloads and short circuits
Rationale: Circuit breakers interrupt the flow of electricity when
excessive current is detected.
7. What is the purpose of a junction box?
A. Store electrical components
B. Connect wires safely
C. Measure voltage
D. Increase current
Answer: B) Connect wires safely
Rationale: Junction boxes house wire connections and protect them
from damage.
8. What device is used to measure voltage in a circuit?
A. Closed circuit
B. Open circuit
C. Short circuit
D. Parallel circuit
Answer: C) Short circuit
Rationale: A short circuit occurs when resistance is negligible, leading
to excessive current flow.
2. Which formula represents electrical resistance?
A. R = V/I
B. R = VI
C. R = P/V
D. R = I/V
Answer: A) R = V/I
Rationale: Resistance is calculated as voltage divided by current.
3. In a DC circuit, the direction of current flow is:
A. Alternating
B. Constant
,C. Reversing periodically
D. Varying with frequency
Answer: B) Constant
Rationale: In a direct current (DC) circuit, current flows consistently in
one direction.
4. The role of a rectifier in an electrical circuit is to:
A. Increase voltage
B. Convert AC to DC
C. Reduce current
D. Store energy
Answer: B) Convert AC to DC
Rationale: Rectifiers convert alternating current (AC) to direct current
(DC).
5. Which type of conduit is best suited for outdoor use?
A. EMT
B. PVC
C. FMC
D. AC
Answer: B) PVC
, Rationale: PVC conduit is corrosion-resistant and suitable for outdoor
environments.
6. What is the purpose of a circuit breaker?
A. Measure current
B. Control resistance
C. Prevent overloads and short circuits
D. Increase voltage
Answer: C) Prevent overloads and short circuits
Rationale: Circuit breakers interrupt the flow of electricity when
excessive current is detected.
7. What is the purpose of a junction box?
A. Store electrical components
B. Connect wires safely
C. Measure voltage
D. Increase current
Answer: B) Connect wires safely
Rationale: Junction boxes house wire connections and protect them
from damage.
8. What device is used to measure voltage in a circuit?
