MCQ in Electrical Circuit Part 9 | ECE Board Exam

(Last Updated On: April 18, 2018)
MCQ in Electrical Circuit Part 9

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°

View Answer:

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

View Answer:

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

View Answer:

Answer: Option C

Solution:

404.  The circuit admittance Y = 0.2 – j0.6, the circuit is

A.  resistive

B.  inductive

C.  capacitive

D.  reactive

View Answer:

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

View Answer:

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

View Answer:

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

View Answer:

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

View Answer:

Answer: Option B

Solution:

409.  A series circuit at resonance would mean, the circuit is

A.  resistive

B.  inductive

C.  capacitive

D.  reactive

View Answer:

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

View Answer:

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

View Answer:

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

View Answer:

Answer: Option C

Solution:

413.  A parallel circuit at resonance would mean, the circuit is

A.  resistive

B.  inductive

C.  reactive

D.  capacitive

View Answer:

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

View Answer:

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

View Answer:

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

View Answer:

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

View Answer:

Answer: Option D

Solution:

418.  _________ is a parallel LC circuit.

A.  Parallel resisting circuit

B.  Static circuit

C.  Tank circuit

D.  Hartley circuit

View Answer:

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

View Answer:

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

View Answer:

Answer: Option C

Solution:

Questions and Answers in Electrical Circuit

Following is the list of multiple choice questions in this brand new series:
MCQ in Electrical Circuit
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART 3
PART 4: MCQs from Number 151 – 200                 Answer key: PART 4
PART 5: MCQs from Number 201 – 250                 Answer key: PART 5
PART 6: MCQs from Number 251 – 300                 Answer key: PART 6
PART 7: MCQs from Number 301 – 350                 Answer key: included
PART 8: MCQs from Number 351 – 400                 Answer key: included
PART 9: MCQs from Number 401 – 420                 Answer key: included

Complete List of MCQ in Electronics Engineering per topic

MCQ in Electrical Circuit Part 9 | ECE Board Exam
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