Basic Electrical Engineering Multiple Choice Questions on “Parallel Impedance Circuits”.
1. In an impedance parallel network, the reactive component will ____________ the voltage by 90 degrees.
A. Lead
B. Lag
C. Either lead or lag
D. Depends on the circuit
Answer: C
Clarification: In an impedance parallel network the reactive component will either lead or lag the voltage by 90 degrees.
2. In an impedance parallel network, the reactive component will either lead or lag the voltage by _________ degrees.
A. 0
B. 90
C. 45
D. 180
Answer: B
Clarification: In an impedance parallel network the reactive component will either lead or lag the voltage by 90 degrees.
3. In an impedance parallel network, the reactive component will either lead or lag the ________ by 90 degrees.
A. Voltage
B. Current
C. Either voltage or current
D. Cannot be determined
Answer: A
Clarification: In an impedance parallel network the reactive component will either lead or lag the voltage by 90 degrees.
4. The reactive component in an impedance parallel circuit leads the voltage when the current _________ the voltage.
A. Leads
B. Lags
C. Either leads or lags
D. Cannot be determined
Answer: A
Clarification: The reactive component in an impedance parallel circuit leads the voltage when the current leads the voltage.
5. The active component in an impedance parallel circuit will __________ the voltage.
A. Leads
B. Lags
C. Be in phase with
D. Either leads or lags
Answer: C
Clarification: The active component in an impedance parallel network will always be in phase with the voltage in the circuit.
6. The phase difference between the active component of an impedance parallel circuit and the voltage in the network is __________
A. 0
B. 90
C. 180
D. 360
Answer: A
Clarification: The active component in an impedance parallel network will always be in phase with the voltage in the circuit. Hence the phase difference is 0.
7. The quadrature component is also known as?
A. Active component
B. Reactive component
C. Either active or reactive component
D. Neither active nor reactive component
Answer: B
Clarification: The quadrature component is also known as the reactive component because the reactive component forms a quadrature with the voltage.
8. Find the expression for the current I from the given circuit.
/basic-electrical-engineering-questions-answers-parallel-impedance-circuits-q81″>
A. I=IL
B. I=IR
C. I=IL+IR
D. I=0
Answer: C
Clarification: I is the total current in the circuit. Since this is a parallel connection, the total current in the circuit is equal to the sum of the currents in each branch of the circuit. Hence I=IR+IL.
9. Find the value of IR if I=10A and IL=8A.
/basic-electrical-engineering-questions-answers-parallel-impedance-circuits-q81″>
A. 5A
B. 18A
C. 12A
D. 2A
Answer: D
Clarification: We know that I=IR+IL.
10=IR+8 => IR=2A.
10. Find the total current if IL=2A and IR=8A.
/basic-electrical-engineering-questions-answers-parallel-impedance-circuits-q81″>
A. 3A
B. -3A
C. 7A
D. 10A
Answer: D
Clarification: We know that I=IR+IL.
I=8+2=10A.