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# MCQ in DC Circuits Part 5 | REE Board Exam

This is the Multiple Choice Questions Part 5 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 5 of the Series

OHMโS LAW AND ELECTRIC CIRCUITS

Choose the letter of the best answer in each questions.

201.ย  Theย  hotย  resistanceย  ofย  anย  incandescentย  lampย  isย  10 ohms and the rated voltage is 50 V. Find the series resistance required to operate the lamp from an 80 V supply.

A.ย  8 ฮฉ

B.ย  4 ฮฉ

C.ย  6 ฮฉ

D.ย  10 ฮฉ

Solution:

202.ย  Ohmโs law is not applicable to

A.ย  copper

B.ย  silver

C.ย  silicon carbide

D.ย  aluminum

Solution:

203.ย  The practical unit of electrical energy is

A.ย  watt

B.ย  kilowatt

C.ย  kilowatt-hour

D.ย  megawatt

Solution:

204.ย  A 100 watt lamp working for 20 hoursย  will consume ____ units.

A.ย  200

B.ย  20

C.ย  2

D.ย  5

Solution:

205.ย  Theย  hotย  resistanceย  ofย  anย  incandescentย  lampย  is about ____ its cold resistance.

A.ย  10 times

B.ย  2 times

C.ย  100 times

D.ย  50 times

Solution:

206.ย  A d.c. circuit usually has ______ as the load.

A.ย  resistance

B.ย  inductance

C.ย  capacitance

D.ย  both inductance and capacitance

Solution:

207.ย  The purpose of load in an electric circuit is to ______.

A.ย  increase the circuit current

B.ย  utilize electrical energy

C.ย  decrease the circuit current

D.ย  none of these

Solution:

208.ย  Electricalย  appliancesย  areย  notย  connectedย  inย  series because ______.

A.ย  series circuit is complicated

B.ย  appliances have differentย ย  current rating

C.ย  power loss is more

D.ย  none of these

Solution:

209.ย  Electricalย  appliancesย  areย  connectedย  inย  parallel because it ______.

A.ย  is a simple circuit

B.ย  draws less current

C.ย  results in reduce in power loss

D.ย  makes the operation of appliances independent of each other

Solution:

210.ย  Inductanceย  andย  capacitanceย  areย  notย  relevantย  inย  a d.c. circuit because ______.

A.ย  frequency of d.c. is zero

B.ย  it is a simple circuit

C.ย  they do not exist in a d.c. circuit

D.ย  none of these

Solution:

211.ย  Theย  hotย  resistanceย  ofย  aย  100ย  watt,ย  250ย  V incandescent lamp would be

A.ย  2.5 ohms

B.ย  625 ohms

C.ย  25 ohms

D.ย  none of these

Solution:

212.ย  Theย  voltageย  dropย  acrossย  14.5ย  ohmย  resistorย  inย  Fig. 2.1 is ______.

A.ย  29 V

B.ย  14 V

C.ย  30.5 V

D.ย  18 V

Solution:

213.ย  The circuit shown in Fig. 2.1 is called a series circuit because ______.

A.ย  it contains a few resistances

B.ย  itย  carriesย  theย  sameย  currentย  throughoutย  the circuit

C.ย  it is a simple circuit

D.ย  none of these

Solution:

214. Referringย  toย  Fig.ย  2.2,ย  theย  totalย  circuitย  resistanceย  willย  be ______.

A.ย  1000 ohms

B.ย  400 ohms

C.ย  1400 ohms

D.ย  135 ohms

Solution:

215.ย  In Fig. 2.2 ____.

A.ย  the lamp A will be brighter than lamp B

B.ย  the lamp B will be brighter than lamp A

C.ย  the two lamps will be equally bright

D.ย  none of these

Solution:

216.ย  Whenย  aย  numberย  ofย  resistancesย  areย  connectedย  in parallel, the total resistance is ______.

A.ย  less than the smaller resistance

B.ย  greater than the smaller resistance

C.ย  between the smaller and greatest resistance

D.ย  none of these

Solution:

217.ย  Twoย  resistancesย  ofย  6ย  ohmsย  andย  3ย  ohmsย  are connected in parallel. The total resistance is ______.

A.ย  9 ohms

B.ย  18 ohms

C.ย  0.5 ohm

D.ย  2 ohms

Solution:

218.ย  The value of R that will give a total resistance of 1.5 ohms in Fig. 2.3 is _____.

A.ย  4 ohms

B.ย  6 ohms

C.ย  3 ohms

D.ย  9 ohms

Solution:

219.ย  Theย  currentย  inย  2.5ย  ohmย  resistorย  inย  Fig.ย  2.4ย  willย  be ____.

A.ย  3 A

B.ย  4.5 A

C.ย  2.5 A

D.ย  2 A

Solution:

220.ย  The current in 4.5 ohms resistor in Fig. 2.4 will be ______.

A.ย  3.5 A

B.ย  3 A

C.ย  2 A

D.ย  2.5 A

Solution:

221.ย  Ifย  18ย  resistances,ย  eachย  ofย  valueย  36ย  ohms,ย  are connectedย  inย  parallel,ย  thenย  theย  totalย  resistanceย  is ______.

A.ย  2 ohms

B.ย  54 ohms

C.ย  36 ohms

D.ย  none of these

Solution:

222.ย  Twoย  incandescentย  lampsย  ofย  100ย  W,ย  200ย  Vย  areย  in parallelย  acrossย  200ย  Vย  supply.ย  Theย  totalย  resistance will be ____.

A.ย  800 ohms

B.ย  200 ohms

C.ย  400 ohms

D.ย  600 ohms

Solution:

223.ย  The resistance across the terminals AB of the circuit shown in Fig. 2.5 is ______.

A.ย  36 ohms

B.ย  18 ohms

C.ย  9 ohms

D.ย  15 ohms

Solution:

224.ย  Ifย  aย  d.c.ย  supplyย  ofย  180ย  Vย  isย  connectedย  across terminalsย  ABย  inย  Fig.ย  2.5,ย  thenย  currentย  inย  6ย  ohm resistor will be ____.

A.ย  10 A

B.ย  5 A

C.ย  12 A

D.ย  6 A

Solution:

225.ย  Theย  resistanceย  acrossย  terminalsย  ACย  inย  Fig.ย  2.5ย  is ______.

A.ย  36 ohms

B.ย  9 ohms

C.ย  18 ohms

D.ย  8 ohms

Solution:

226.ย  Theย  resistanceย  acrossย  terminalsย  ABย  ofย  theย  circuit shown in Fig. 2.6 is ______.

A.ย  4 ohms

B.ย  18 ohms

C.ย  34 ohms

D.ย  8 ohms

Solution:

227.ย  If a battery of 24 V is applied across terminals AB of the circuit shown in Fig. 2.6, then current in 2 ohm resistor will be ____.

A.ย  3 A

B.ย  6 A

C.ย  2.5 A

D.ย  1.5 A

Solution:

228.ย  If a battery of 24 V is applied across terminals AB in Fig. 2.6, then power loss in 5 ohms resistor will be ______.

A.ย  180 W

B.ย  45 W

C.ย  90 W

D.ย  24 W

Solution:

229.ย  Theย  totalย  conductanceย  ofย  theย  circuitย  shownย  inย  Fig. 2.7 is _____.

A.ย  13 mhos

B.ย  1.6 mhos

C.ย  6 mhos

D.ย  2.5 mhos

Solution:

230.ย  Ifย  10ย  ohmsย  resistanceย  isย  removedย  inย  Fig.ย  2.7,ย  then total conductance of the circuit will be _____.

A.ย  3 mhos

B.ย  6 mhos

C.ย  2 mhos

D.ย  1.5 mhos

Solution:

231.ย  The voltage across the parallel circuit shown in Fig. 2.8 is _____.

A.ย  15 V

B.ย  10 V

C.ย  30 V

D.ย  12. 5 V

Solution:

232.ย  The current in 10 ohms resistor in Fig. 2.8 is ______.

A.ย  3 A

B.ย  2.5 A

C.ย  1.5 A

D.ย  3.5 A

Solution:

233.ย  Theย  totalย  resistanceย  betweenย  terminalsย  1ย  andย  2ย  of the circuit shown in Fig. 2.9 is _____.

A.ย  12 ohms

B.ย  2.67 ohms

C.ย  2 ohms

D.ย  64 ohms

Solution:

234.ย  If a battery of 12 V is applied across terminals 1 and 2 of Fig. 1.9, then current through 4 ohms resistor will be _____.

A.ย  1.5 A

B.ย  3 A

C.ย  2 A

D.ย  2.5 A

Solution:

235.ย  Theย  resistanceย  betweenย  terminalsย  1ย  andย  2ย  ofย  Fig. 1.10 is ______.

A.ย  12 ohms

B.ย  8 ohms

C.ย  16 ohms

D.ย  3 ohms

Solution:

236.ย  Theย  resistanceย  betweenย  terminalsย  1ย  andย  2ย  inย  Fig. 1.11 is ______.

A.ย  2 ohms

B.ย  1.5 ohms

C.ย  1 ohm

D.ย  4 ohms

Solution:

237.ย  Ifย  a battery of 6 V is applied across terminals 1 and 2 in Fig. 1.11, then current in the horizontal 2 ohm resistor will be _____.

A.ย  1 A

B.ย  2 A

C.ย  3 A

D.ย  0.5 A

Solution:

238.ย  The resistance across terminals 1 and 2 in Fig. 1.12 is ____.

A.ย  6 ohms

B.ย  12 ohms

C.ย  18 ohms

D.ย  24 ohms

Solution:

239.ย  Twoย  equalย  resistancesย  areย  connectedย  inย  series across a certain supply. If the resistances are now connectedย  inย  parallelย  acrossย  theย  sameย  supply,ย  the powerย  producedย  willย  beย  ____ย  thatย  ofย  series connection.

A.ย  two times

B.ย  four times

C.ย  one-half

D.ย  one-fourth

Solution:

240.ย  Referringย  toย  Fig.ย  1.13,ย  theย  resistanceย  across terminals BE is _____.

A.ย  9 ohms

B.ย  18 ohms

C.ย  10 ohms

D.ย  none of these

Solution:

241.ย  Referringย  toย  Fig.ย  1.13,ย  theย  resistanceย  across terminals AF is ______.

A.ย  20.5 ohms

B.ย  18 ohms

C.ย  11 ohms

D.ย  none of these

Solution:

242.ย  Referringย  toย  Fig.ย  1.13,ย  theย  currentย  inย  18ย  ohms resistor will be _____.

A.ย  2 A

B.ย  1.5 A

C.ย  1 A

D.ย  none of these

Solution:

243.ย  Referringย  toย  Fig.ย  1.13,ย  theย  powerย  lossย  inย  11ย  ohms will be _____.

A.ย  11 W

B.ย  24 W

C.ย  16 W

D.ย  none of these

Solution:

244.ย  If in Fig. 1.14, switches S1ย  and S2ย  are closed, then total circuit resistance is _____.

A.ย  400 ohms

B.ย  1200 ohms

C.ย  1000 ohms

D.ย  2400 ohms

Solution:

245.ย  If switch S1ย  is open and switch S2ย  is closed in Fig. 1.14, then circuit resistance will be _____.

A.ย  1200 ohms

B.ย  1000 ohms

C.ย  1400 ohms

D.ย  2400 ohms

Solution:

246.ย  If in Fig. 1.14, both switches S1ย  and S2ย  are closed, then _____.

A.ย  L1 will be brighter than L2 or L3

B.ย  L1 will be dimmer than L2 or L3

C.ย  L1 will be as bright as L2 or L3

D.ย  none of these

Solution:

247.ย  Ifย  inย  Fig.ย  1.14ย  switchesย  S1ย  andย  S2ย  areย  open,ย  then lamp L1 will give output ______.

A.ย  less than 40 W

B.ย  more than 40 W

C.ย  equal to 40 W

D.ย  none of these

Solution:

248.ย  If in Fig. 1.14 switches S1 and S2 are closed and the supply voltage is increased to 400 V, then _____.

A.ย  lamp L1 will burn out

B.ย  lamp L2 will burn out

C.ย  both lamps L2 and L3 will burn out

D.ย  all the lamps will be safe

Solution:

249.ย  Ifย  inย  Fig.ย  1.1,ย  resistorย  R2ย  becomesย  open-circuited, the reading of the voltmeter will become

A.ย  zero

B.ย  150 V

C.ย  50 V

D.ย  200 V

Solution:

250.ย  Whatever the battery voltage in Fig. 1.2, it is certain thatย  smallestย  currentย  willย  flowย  inย  theย  resistanceย  of _____ ohm.

A.ย  300

B.ย  500

C.ย  200

D.ย  100

Solution:

#### Questions and Answers in DC Circuits

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

MCQ in DC 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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