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# MCQ in AC Circuits Part 9 | REE Board Exam

This is the Multiple Choice Questions Part 9 of the Series in AC Circuits as one of the Electrical Engineering topic. In Preparation for the REE 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 Electrical Engineering field, Electrical Engineering Books, Journals and other Electrical Engineering References.

#### Continue Practice Exam Test Questions Part 9 of the Series

PARALLEL CIRCUITS

Choose the letter of the best answer in each questions.

401.ย  The total line current drawn by the circuit shown in Fig. 13.1 is

A.ย  8/โ2 A

B.ย  16 A

C.ย ย  8โ2 A

D.ย  none of these

Solution:

402.ย  The power consumed in the circuit shown in Fig. 13.2 is

A.ย  480 W

B.ย  960 W

C.ย  1200 W

D.ย  none of these

Solution:

403.ย  The active component of line current in Fig. 13.2 is

A.ย  6 A

B.ย  3 A

C.ย  13 A

D.ย  4 A

Solution:

404.ย  The line current drawn by the circuit shown in Fig. 13.2 is

A.ย  13 A

B.ย  6 A

C.ย  5 A

D.ย  none of these

Solution:

405.ย  The power factor of the circuit shown in Fig. 13.2 is

A.ย  0.8

B.ย  0.5

C.ย  0.707

D.ย  none of these

Solution:

406.ย  The impedance of the circuit shown in Fig. 13.2 is

A.ย  180 ohms

B.ย  24 ohms

C.ย  48 ohms

D.ย  none of these

Solution:

407.ย  The circuit shown in Fig. 13.2 is

A.ย  resistive

B.ย  capacitive

C.ย  inductive

D.ย  in resonance

Solution:

408.ย  If in Fig. 13.2, XL is made equal to XC, the line current will be

A.ย  10 A

B.ย  6 A

C.ย  4 A

D.ย  none of these

Solution:

409.ย  The power consumed in the circuit shown in Fig. 13.3 is

A.ย  8400 W

B.ย  3600 W

C.ย  4000 W

D.ย  none of these

Solution:

410.ย  If the circuit shown in Fig. 13.3 is connected to 120 V dc, the current drawn by the circuit is

A.ย  24 A

B.ย  70 A

C.ย  48 A

D.ย  30 A

Solution:

411.ย  The circuit shown in Fig. 13.3 is

A.ย  capacitive

B.ย  inductive

C.ย  resistive

D.ย  in resonance

Solution:

412.ย  If the source frequency of Fig. 13.4 is low, then

A.ย  coil takes a high lagging current

B.ย  coil takes a low lagging current

C.ย  capacitor takes a leading current

D.ย  circuit offers high impedance

Solution:

413.ย  If the source frequency of Fig. 13.4 is high, then

A.ย  coil takes a high lagging current

B.ย  capacitor takes a high leading current

C.ย  capacitor takes a low leading current

D.ย  circuit offers high impedance

Solution:

414.ย  The circuit shown in Fig. 13.5 is

A.ย  in resonance

B.ย  resistive

C.ย  inductive

D.ย  capacitive

Solution:

415.ย  The circuit shown in Fig. 13.5 will consume a power of

A.ย  1200 W

B.ย  2400 W

C.ย  500 W

D.ย  none of these

Solution:

416.ย  If the admittance of a parallel ac circuit is increased, the circuit current

A.ย  remains constant

B.ย  is decreased

C.ย  is increased

D.ย  none of these

Solution:

417.ย  The admittance of the circuit shown in Fig. 13.6 is

A.ย  10 S

B.ย  14 S

C.ย  0.1 S

D.ย  none of these

Solution:

418.ย  The conductance of the circuit shown in Fig. 13.6 is

A.ย  14 S

B.ย  0.6 S

C.ย  0.06 S

D.ย  none of these

Solution:

419.ย  The inductive susceptance of the circuit shown in Fig. 13.6 is

A.ย  8 S

B.ย  0.8 S

C.ย  0.08 S

D.ย  none of these

Solution:

420.ย  The circuit shown in Fig. 13.7 is

A.ย  resistive

B.ย  inductive

C.ย  capacitive

D.ย  none of these

Solution:

421.ย  The power loss in the circuit shown in Fig. 13.7 is

A.ย  100 W

B.ย  10,000 W

C.ย  10 W

D.ย  none of these

Solution:

422.ย  The conductance and susceptance components of admittance are

A.ย  series elements

B.ย  parallel elements

C.ย  series-parallel elements

D.ย  none of these

Solution:

423.ย  Theย  impedanceย  ofย  aย  circuitย  isย  10ย  ohms.ย  Ifย  theย  inductiveย  susceptanceย  isย  1 siemen, then inductive reactance of the circuit is

A.ย  10 ohms

B.ย  1 ohm

C.ย  100 ohms

D.ย  none of these

Solution:

424.ย  Theย  conductanceย  andย  inductiveย  susceptanceย  ofย  aย  circuitย  haveย  theย  same magnitude. The power factor of the circuit is

A.ย  1

B.ย  0.5

C.ย  0.707

D.ย  0.866

Solution:

425.ย  The admittance of a circuit is (0.1 + j0.8) S. The circuit is

A.ย  resistive

B.ย  capacitive

C.ย  inductive

D.ย  none of these

Solution:

426.ย  In a parallel ac circuit, power loss is due to

A.ย  conductance alone

B.ย  susceptance alone

C.ย  both conductance and susceptance

D.ย  none of these

Solution:

427.ย  The admittance of a parallel circuit is 0.12โ -30ยฐ S. The circuit is

A.ย  inductive

B.ย  capacitive

C.ย  resistive

D.ย  none of these

Solution:

428.ย  A circuit have an impedance of (1 โย  j2) ohms. The susceptance of the circuit is

A.ย  0.1 S

B.ย  0.2 S

C.ย  0.4 S

D.ย  none of these

Solution:

429.ย  Aย  circuitย  hasย  admittanceย  ofย  0.1ย  Sย  andย  conductanceย  ofย  0.08ย  S.ย  Theย  power factor of the circuit is

A.ย  0.1

B.ย  0.8

C.ย  0.08

D.ย  none of these

Solution:

430.ย  When an sinusoidal voltage is applied across R-L parallel circuit so that R = XL the phase angle will be

A.ย  45ยฐ lagging

C.ย  90ยฐ lagging

Solution:

431.ย  In a parallel R-L circuit if IR is the current in resistor and IL is the current in the inductor, then

A.ย  IR lags IL by 90ยฐ

B.ย  IR leads IL by 270ยฐ

C.ย  IL leads IR by 270ยฐ

D.ย  IL lags IR by 90ยฐ

Solution:

432.ย  The current read by the ammeter A in the ac circuit shown is the given figure is

A.ย  9 A

B.ย  5 A

C.ย  3 A

D.ย  1 A

Solution:

433.ย  In the given figure, the admittance values of the elements in siemens are YR = 0.5 + j0, YLย  = 0ย  โย  j1.5 and YCย  = 0 + j0.3 respectively. The value of I as a phasor when the voltage E across the elements is 10โ 0ยฐ V is

A.ย  1.5 + j-.5

B.ย  5 โ j18

C.ย  0.5 + j1.8

D.ย  5 โ j12

Solution:

434.ย  For the circuit shown in the figure, how much the voltage across the inductor leads the voltage across the capacitor?

A.ย  45ยฐ

B.ย  90ยฐ

C.ย  135ยฐ

D.ย  180ยฐ

Solution:

435.ย  In the circuit shown in the figure, v = cos 2t, Z2ย  = 1 + j. C1ย  is chosen so that i = cos 2t. The value of C1 is

A.ย  2 F

B.ย  1 F

C.ย  0.5 F

D.ย  0.25 F

Solution:

436.ย  For the given ac circuit, what is the value of I?

A.ย  1 + j

B.ย  1 + j0

C.ย  2 – j

D.ย  0 + j0

Solution:

437.ย  For the network shownย  in the given figure Z(0) = 3 ฮฉ and Z(โ) = 2 ฮฉ. The values of R1 and R2 will respectively be

A.ย  2 ฮฉ, 1 ฮฉ

B.ย  1 ฮฉ, 2 ฮฉ

C.ย  3 ฮฉ, 2 ฮฉ

D.ย  2 ฮฉ, 3 ฮฉ

Solution:

438.ย  The total impedance Z(jฯ) of the circuit shown is

A.ย  6 + j0 ฮฉ

B.ย  7 + j0 ฮฉ

C.ย  0 + j8 ฮฉ

D.ย  6 + j8 ฮฉ

Solution:

439.ย  A resistance of 40 ohms and an inductive reactor of 30 ohms are joined in parallel to a 120 volts supply as shown in the figure. The power factor of the circuit is

A.ย  0.6

B.ย  0.7

C.ย  0.8

D.ย  unity

Solution:

440.ย  In a parallel RC circuit,

A.ย  IC lags IR by 90ยฐ

B.ย  IR and IC are in phase

C.ย  IC leads IR by 90ยฐ

D.ย  IR leads IC by 90ยฐ

Solution:

441.ย  In a parallel RC circuit,

A.ย  VC and IR are in phase

B.ย  VC and IC are in phase

C.ย  IC and IR are in phase

D.ย  VC and IR are 90ยฐ out of phase

Solution:

442.ย  When the frequency of the applied voltage increases in a parallel RC circuit

A.ย  the phase angle, ฮธT, increases

B.ย  ZEQ increases

C.ย  ZEQ decreases

D.ย  both A and C

Solution:

443.ย  In a parallel RL circuit,

A.ย  iL lags iR by 90ยฐ

B.ย  iL leads iR by 90ยฐ

C.ย  iL and iR are in phase

D.ย  iR lags iL by 90ยฐ

Solution:

444.ย  In a parallel RL circuit,

A.ย  VT and IL are in phase

B.ย  IL and IR are in phase

C.ย  VT and IR are in phase

D.ย  VT and IR are 90ยฐ out of phase

Solution:

445.ย  When the frequency of the applied voltage decreases in a parallel RL circuit

A.ย  the phase angle, ฮธI, becomes less negative

B.ย  ZEQ increases

C.ย  ZEQ decreases

D.ย  both A and B

Solution:

446.ย  When the frequency of the applied voltage increases in a parallel RL circuit

A.ย  ฮธZ increases

B.ย  ZT decreases

C.ย  ZT increases

D.ย  both A and C

Solution:

447.ย  In an ac circuit with only parallel inductors

A.ย  IT lags VT by 90ยฐ

B.ย  VT lags IT by 90ยฐ

C.ย  VT and IT are in phase

D.ย  none of these

Solution:

448.ย  In a parallel ac circuit with XL and XC

A.ย  IL and IC are 90ยฐ out of phase

B.ย  IL and IC are in phase

C.ย  IL and IC are 180ยฐ out of phase

D.ย  XL and XC are 90ยฐ out of phase

Solution:

D.ย  RESONANCE

449.ย  REE Board Exam October 2000

A series circuit consists of a 20-ohm resistance, a 150 mH inductance and an unknown capacitance. The circuit is supplied with a voltage v = 100 sin 377t. Find the value of capacitance at resonance.

A.ย  42 ฮผF

B.ย  47 ฮผF

C.ย  34.65 ฮผF

D.ย  72.57 ฮผF

Solution:

450.ย  REE Board Exam April 2001

Aย  5ย  mHย  pureย  inductanceย  isย  connectedย  inย  parallelย  withย  oneย  microfarad capacitor. What frequency will the circuit be antiresonance?

A.ย  250 Hz

B.ย  2250 Hz

C.ย  60 Hz

D.ย  100 Hz

Solution:

#### Questions and Answers in AC Circuits

Following is the list of practice exam test questions in this brand new series:

MCQ in AC Circuits
PART 1: MCQ from Number 1 โ 50                  Answer key: included
PART 2: MCQ from Number 51 โ 100              Answer key: included
PART 3: MCQ from Number 101 โ 150            Answer key: included
PART 4: MCQ from Number 151 โ 200            Answer key: included
PART 5: MCQ from Number 201 โ 250             Answer key: included
PART 6: MCQ from Number 251 โ 300             Answer key: included
PART 7: MCQ from Number 301 โ 350             Answer key: included
PART 8: MCQ from Number 351 โ 400             Answer key: included
PART 9: MCQ from Number 401 โ 450             Answer key: included
PART 10: MCQ from Number 451 โ 500           Answer key: included

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