MCQ in DC Circuits Part 10 | REE Board Exam

This is the Multiple Choice Questions Part 10 of the Series in DC 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 10 of the Series

NETWORK THEOREMS

Choose the letter of the best answer in each questions.

⇐ MCQ in DC Circuits Part 9 | REE Board Exam

451.  The value of R_th in Fig. 3.4(b) is ____.

A.  15 Ω

B.  3.5 Ω

C.  6.4 Ω

D.  7.4 Ω

452.  The  open-circuited  voltage  at  terminals  AB  in  Fig. 3.4(a) is

A.  12 V

B.  20 V

C.  24 V

D.  40 V

453.  For transfer of maximum power in the circuit shown in Fig. 3.4(a), the value of R_L should be ____.

A.  3.5 Ω

B.  6.4 Ω

C.  7.4 Ω

D.  15 Ω

454.  Fig. 3.5(b) shows Norton’s equivalent circuit of Fig. 3.5(a). The value of R_N is ____.

A.  5 Ω

B.  4.5 Ω

C.  10.5 Ω

D.  none of these

455.  The value of I_N in Fig. 3.5(b) is ____.

A.  3 A

B.  1 A

C.  2 A

D.  none of these

456.  Thevenin’s  theorem  is  ____  form  on an equivalent circuit.

A.  voltage

B.  current

C.  both voltage and current

D.  none of these

457.  Norton’s theorem is ____ Thevenin’s theorem.

A   the same as.

B.  converse of

C.  equal to

D.  none of these

458.  In  the  analysis  of  a  vacuum  tube  circuit,  we generally use ____.

A.  superposition

B.  Norton’s

C.  Thevenin’s

D.  reciprocity

459.  Norton’s  theorem  is  ____  form  of  an  equivalent circuit

A.  voltage

B.  current

C.  both voltage and current

D.  none of these

460.  In  the  analysis  of  a  transistor  circuit,  we  generally use ____.

A.  Norton’s

B.  Thevenin’s

C.  reciprocity

D.  superposition

461.  Fig.  3.6(a)  shows  Norton’s  equivalent  circuit  of  a network  whereas  Fig.  3.6(b)  shows  its  Thevenin’s equivalent circuit. The value of V_th is ____.

A.  1.5 V

B.  0.866 V

C.  3 V

D.  6 V

462.  The value of R_th in Fig. 3.6(b) is ____.

A.  3 Ω

B.  2 Ω

C.  1.5 Ω

D.  6 Ω

463.  If in Fig. 3.6(a), the value of I_N  is 3 A, then value of V_th in Fig. 3.6(b) will be ____.

A.  1 V

B.  9 V

C.  5 V

D.  none of these

464.  For maximum power transfer, the relation between load resistance R_L  and internal resistance R_i  of the voltage source is ____.

A.  R_L = 2R_i

B.  R_L = 0.5R_i 

C.  R_L = 1.5R_i

D.  R_L = R_i

465.  Under  the  conditions  of  maximum  power  transfer, the efficiency is ____.

A.  75%

B.  100%

C.  50%

D.  25%

466.  The open-circuited voltage at terminals of load R_L is 30  V  Under  the  conditions  of  maximum  power transfer, the load voltage would be ____.

A.  30 V

B.  10 V

C.  5 V

D.  15 V

467.  The  maximum  power  transfer  theorem  is  used  in ____.

A.  electronic circuits

B.  power system

C.  home lighting circuits

D.  none of these

468.  Under the conditions of maximum power transfer, a voltage source is delivering a power of 30 W to the load. The power generated by the source is ____.

A.  45 W

B.  30 W

C.  60 W

D.  90 W

469.  For  the  circuit  shown  in  Fig.  3.7,  the  power transferred  will  be  maximum  when  R_L  is  equal  to _____.

A.  4.5 Ω

B.  6 Ω

C.  3 Ω

D.  none of these

470.  The  open-circuited  voltage  at  terminals  AB  in  Fig. 3.7 is ____.

A.  12 V

B.  6 V

C.  15 V

D.  9.5 V

471.  If  in  Fig.  3.7,  the  value  of  R_L  =  6  Ω,  then  current through R_L is ____.

A.  2 A

B.  1.5 A

C.  1.75 A

D.  1 A

472.  Under  the  conditions  of  maximum  power  transfer, the voltage across R_L in Fig. 3.7 is ____.

A.  6 V

B.  4 V

C.  9 V

D.  12 V

473.  The output resistance of a voltage source is 4 Ω. Its internal resistance will be ____.

A.  4 Ω

B.  2 Ω

C.  1 Ω

D.  infinite

474.  Delta/star  of  star/delta  transformation  technique  is applied to _____.

A.  one terminal

B.  two terminal

C.  three terminal

D.  none of these

475.  Kirchhoff’s current law is applicable to only

A.   closed loops in a network

B.  electronic circuits

C.  conjunctions in a network

D.  electric circuits

476.  Kirchhoff’s voltage law is concerned with

A.  IR drops

B.  battery e.m.f.s.

C.  junction voltages

D.  both A and B

477.  According to KVL, the algebraic sum of all IR drops and  e.m.f.s  in  any  closed  loop  of  a  network  is always

A.  zero

B.  positive

C.  negative

D.  determined by the battery e.m.f.s

478.  The  algebraic  sign  of  an  IR  drop  is  primarily dependent upon the

A.  amount of current flowing through it

B.  value of R

C.  direction of current flow

D.  battery connection

479.  Maxwell’s  loop current  method  of solving  electrical networks

A.  uses branch currents

B.  utilizes Kirchhoff’s voltage law

C.  is confined to single-loop circuits

D.  is a network reduction method

480.  Point  out  the  WRONG  statement.  In  the  node-voltage  technique  of  solving  networks,  choice  of  a reference node does not

A.  affect the operation of the circuit

B.  change the voltage across any element

C.  alter the p.d. between any pair of nodes

D.  affect the voltages of various nodes

481.  The  nodal  analysis  is  primarily  based  on  the application of

A.  KVL

B.  KCL

C.  Ohm’s Law

D.  both B and C

482.  Superposition  theorem  is  can  be  applied  only  to circuits having ____ elements.

A.  non-linear

B.  passive

C.  linear bilateral

D.  resistive

483.  The Superposition theorem is essentially based on the concept of

A.  duality

B.  linearity

C.  reciprocity

D.  non-linearity

484.  While Thevenizing a circuit between two terminals, V_th equals

A.  short-circuit terminal voltage

B.  open circuit terminal voltage

C.  EMF of the battery nearest to the terminal

D.  net voltage available in the circuit

485.  Thevenin resistance R_th is found

A.  between any two “open” terminals

B.  by short-circuiting the given two terminals

C.   by  removing  voltage  sources  along  with  their internal resistance

D.  between same open terminals as for V_th

486.  While  calculating  R_th,  constant-current  sources  in the circuit are

A.  replaced by “opens”

B.  replaced by “shorts”

C.  treated in parallel with other voltage sources

D.  converted into equivalent voltage sources

487.  Thevenin resistance of the circuit of  Fig. 2.1 across its terminals A and B is ____ ohm.

A.  6

B.  3

C.  9

D.  2

488.  The  load  resistance  needed  to  extract  maximum power from the circuit of Fig. 2.2 is ____ ohm.

A.  2

B.  9

C.  6

D.  18

489.  The Norton equivalent circuit for the network of Fig. 2.2  between  A  and  B  is  ____  current  source  with parallel resistance of ____.

A.  2 A, 6 Ω

B.  3 A, 2 Ω

C.  2 A, 3 Ω

D.  3 A, 9 Ω

490.  The Norton equivalent of a circuit consists of a 2 A current  source  in  parallel  with  a  4 Ω  resistor. Thevenin  equivalent  of  this  circuit  is  a  ____  volt source in series with a 4 Ω resistor.

A.  2

B.  0.5

C.  6

D.  8

491.  If  two  identical  3  A,  4  Ω Norton  equivalent  circuits are  connected  in  parallel  with  like  polarity  to  like, the combined Norton equivalent circuit is

A.  6 A, 4 Ω

B.  6 A, 2 Ω

C.  3 A, 2 Ω

D.  6 A, 8 Ω

492.  Two  6  V,  2  Ω batteries  are  connected  in  series aiding.  This  combination  can  be  replaced  by  a single  equivalent  current  generator  of  ____  with  a parallel resistance of ____ ohm.

A.  3 A, 4 Ω

B.  3 A, 2 Ω

C.  3 A, 1 Ω

D.  5 A, 2 Ω

493.  Two  identical  3  A,  1  Ω batteries  are  connected  in parallel  with  like  polarity  with  like  polarity  to  like. The Norton equivalent circuit of the combination is

A.  3 A, 0.5 Ω

B.  6 A, 1 Ω

C.  3 A, 1 Ω

D.  6 A, 0.5 Ω

494.  Thevenin equivalent circuit of the network shown in Fig.  2.3  is  required.  The  value  of  the  open-circuit voltage  across  terminals  a  and  b  of  this  circuit  is ____ volt.

A.  zero

B.  2i/10

C.  2i/5

D. 2i/15

495.  For  a  linear  network  containing  generators  and impedance,  the  ratio  of  the  voltage  to  the  current produced  in  other  loop  is  the  same  as  the  ratio  of voltage and  current obtained when the positions of the voltage source and the ammeter measuring the current  are  interchanged.  This  network  theorem  is known as ____ theorem.

A.  Millman’s

B.  Norton’s

C.  Tellegen’s

D.  Reciprocity

496.  A  12  volt  source  with  an  internal  resistance  of  1.2 ohms  is  connected  across  a  wire-wound  resistor. Maximum  power  will  be  dissipated  in  the  resistor when its resistance is equal to

A.  zero

B.  1.2 ohm

C.  12 ohms

D.  infinity

497.  Three 3.33 Ω  resistors are connected in wye. What is the value of the equivalent resistors connected in delta?

A.  3.33 Ω

B.  10 Ω

C.  6.67 Ω

D.  20 Ω

498.  Find the equivalent resistance between terminals a &  b  of  the  circuit  shown.   Each  resistance  has  a value of 1 ohm.

A.  5/6 ohms

B.  5/11 ohms

C.  5/14 ohms

D.  5/21 ohms

499.  What do you call the head to tail connection of two or more op-amp circuits wherein the output of one op-amp is the input of another op-amp?

A.  Parallel Op-Amps

B.  Follow-Thru Connection

C.  Cascade Connection

D.  Series Op-Amps

500.  Find the power dissipation in the 6 ohms resistor in the next figure.

A.  54 W

B.  216 W

C.  121.5 W

D.  150 W

⇒ MCQ in DC Circuits Part 11 | REE Board Exam

Questions and Answers in DC Circuits

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