This is the Multiples Choice Questions Part 9 of the Series in Electrical Circuit as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.
MCQ Topic Outline included in ECE Board Exam Syllabi
- MCQs in AC-DC circuits
- MCQs in Resistors
- MCQs in Inductors
- MCQs in Capacitors
Continue Practice Exam Test Questions Part 9 of the Series
401. A 100-volt source is supplying a parallel RC circuit having a total impedance of 35.35 Ω. Calculate the total line current.
A. 2.83 ∠ 45°
B. 2.83 ∠ -45°
C. 4.00 ∠ 45°
D. 4.00 ∠ -45°
Answer: Option A
Solution:
402. What is the power factor of a circuit if the inductive susceptance and conductance have the same value?
A. 0.325
B. 0.525
C. 0.673
D. 0.707
Answer: Option D
Solution:
403. If a circuit has an admittance of Y = 0.2 + j0.6, the circuit is
A. purely inductive
B. inductive
C. capacitive
D. reactive
Answer: Option C
Solution:
404. The circuit admittance Y = 0.2 – j0.6, the circuit is
A. resistive
B. inductive
C. capacitive
D. reactive
Answer: Option B
Solution:
405. What is the resonant frequency of a circuit when L is 50 microhenrys and C is 40 picofarads are in parallel?
A. 7.96 MHz
B. 79.6 MHz
C. 3.56 MHz
D. 1.78 MHz
Answer: Option C
Solution:
406. If you need an LC circuit to be resonant at 2500 Hz and use a 150 mH coil, what should the capacitance value be?
A. 0.027 μF
B. 0.015 μF
C. 0.15 μF
D. 27 μF
Answer: Option A
Solution:
407. What is the resonant frequency of a circuit when L of 3 microhenry and C of 40 picofarad are in series?
A. 1.33 MHz
B. 14.5 MHz
C. 14.5 kHz
D. 1.33 kHz
Answer: Option B
Solution:
408. What is the resonant frequency of a circuit when L of 25 microhenry and C of 10 picofarad are in parallel?
A. 63.7 MHz
B. 10.1 MHz
C. 63.7 kHz
D. 10.1 kHz
Answer: Option B
Solution:
409. A series circuit at resonance would mean, the circuit is
A. resistive
B. inductive
C. capacitive
D. reactive
Answer: Option A
Solution:
410. Characteristics of the current in a series R-L-C circuit at resonance.
A. It is dc
B. It is a minimum
C. It is zero
D. It is at maximum
Answer: Option D
Solution:
411. What is the cause of a minimum Q on a single-tuned LC circuit?
A. decreased series resistor
B. decreased shunt resistor
C. increased shunt resistor
D. decreased capacitance
Answer: Option C
Solution:
412. Find the half-power bandwidth of a parallel resonant circuit, which has a resonant frequency of 3.6 MHz and a Q of 218.
A. 606 kHz
B. 58.7 kHz
C. 16.5 kHz
D. 47.3 kHz
Answer: Option C
Solution:
413. A parallel circuit at resonance would mean, the circuit is
A. resistive
B. inductive
C. reactive
D. capacitive
Answer: Option A
Solution:
414. What will happen to a parallel ac-circuit if its line frequency is more than the resonant frequency?
A. becomes purely resistive
B. becomes purely capacitive
C. becomes inductive
D. becomes capacitive
Answer: Option D
Solution:
415. In a series ac-circuit, if the line frequency is more than the resonant frequency, the circuit behaves as
A. resistive
B. inductive
C. reactive
D. capacitive
Answer: Option B
Solution:
416. If the line frequency of a parallel ac-circuit is less than the resonant frequency, the circuit behaves as
A. resistive
B. reactive
C. capacitive
D. purely inductive
Answer: Option B
Solution:
417. If an ac-series circuit is supplied with a source whose frequency is less than that of fr, the circuit becomes
A. resistive
B. reactive
C. inductive
D. capacitive
Answer: Option D
Solution:
418. _________ is a parallel LC circuit.
A. Parallel resisting circuit
B. Static circuit
C. Tank circuit
D. Hartley circuit
Answer: Option C
Solution:
419. A parallel LC network with L = 100 mH and C = 25 μF will resonate at what frequency?
A. 25 Hz
B. 45.5 Hz
C. 75.6 Hz
D. 100 Hz
Answer: Option D
Solution:
420. Absolutely, when can we say that the circuit is at resonance?
A. when XL = XC
B. when the current is minimum
C. when the voltage and current are in-phase
D. all of the above
Answer: Option C
Solution:
