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# MCQ in DC Circuits Part 4 | REE Board Exam

This is the Multiple Choice Questions Part 4 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 4 of the Series

OHMโS LAW AND ELECTRIC CIRCUITS

Choose the letter of the best answer in each questions.

151.ย  REE Board Exam October 1998

Theย  resistanceย  ofย  120ย  metersย  ofย  wireย  isย  12ย  ohms. What is its conductance?

A.ย  0.0521 siemens

B.ย  0.0833 siemens

C.ย  6 siemens

D.ย  12 siemens

Solution:

152.ย  EE April 1981, October 1984

Twoย  (2)ย  115-Vย  incandescentย  lampsย  Aย  andย  Bย  are connected in series across a 230-V source. If lamp Aย  isย  ratedย  75ย  wattsย  andย  lampย  Bย  isย  ratedย  50ย  watts, determineย  theย  currentย  drawnย  byย  theย  series connection.

A.ย  0.52 A

B.ย  0.64 A

C.ย  0.48 A

D.ย  0.57 A

Solution:

153.ย  REE Board Exam March 1998

Threeย  resistorsย  ofย  10,ย  15ย  andย  20ย  ohmsย  eachย  are connectedย  inย  parallel.ย  Whatย  isย  theย  equivalent resistance?

A.ย  45 ohms

B.ย  17.2 ohms

C.ย  0.22 ohm

D.ย  4.62 ohms

Solution:

154.ย  REE Board Exam March 1998

Threeย  resistorsย  ofย  10,ย  15ย  andย  20ย  ohmsย  eachย  are connectedย  inย  parallel.ย  Whatย  isย  theย  total conductance?

A.ย  0.217 siemens

B.ย  3.41 siemens

C.ย  4.52 siemens

D.ย  0.562 siemens

Solution:

155.ย  REE Board Exam October 1997

Aย  5-ohmย  resistanceย  isย  connectedย  inย  parallelย  withย  a 10-ohm resistance. Another set, a 6-ohm and an 8-ohm resistances are also connected in parallel. The twoย  setsย  areย  connectedย  inย  series.ย  Whatย  isย  the equivalent resistance?

A.ย  6.76 ohm

B.ย  9.25 ohm

C.ย  14.4 ohms

D.ย  21.2 ohms

Solution:

156.ย  REE Board Exam March 1998

Twoย  resistancesย  ofย  10ย  andย  15ย  ohmsย  each respectively are connected inย  parallel. The two are thenย  connectedย  inย  seriesย  withย  aย  5-ohmย  resistance. What is the equivalent resistance?

A.ย  11 ohms

B.ย  12 ohms

C.ย  10 ohms

D.ย  9 ohms

Solution:

157.ย  REE Board Exam October 1997

A 10-ohm and a 20-ohm resistance are connected inย  parallel.ย  Anotherย  resistanceย  ofย  5-ohmย  is connectedย  inย  seriesย  withย  theย  two.ย  Ifย  theย  supply voltage is 48 volts, what is the current through the 10-ohm resistor?

A.ย  3.21 A

B.ย  2.74 A

C.ย  4.02 A

D.ย  5.72 A

Solution:

158.ย  REE Board Exam March 1998

Twoย  resistancesย  ofย  10ย  andย  15ย  ohms,ย  each respectively are connected in parallel. The two are then connected in series with a 5-ohm resistance. It isย  then connectedย  acrossย  a 12-Vย  battery,ย  whatย  are the current and power?

A.ย  1.2 A, 17.28 W

B.ย  0.96 A, 11.52 W

C.ย  1.09 A, 13.1 W

D.ย  1.5 A, 20.25 W

Solution:

159.ย  REE Board Exam September 2001

Three resistors 10-ฮฉ, 15-ฮฉ and 20-ฮฉ are connected in series across a 48-V source. What is the voltage across the 15-ฮฉ resistor?

A.ย  20 V

B.ย  16 V

C.ย  24 V

D.ย  12 V

Solution:

160.ย  REE Board Exam September 2001

Three resistors 10-ฮฉ, 15-ฮฉ and 20-ฮฉ are connected in parallel. What is the total resistance?

A.ย  3.56 ฮฉ

B.ย  4.62 ฮฉ

C.ย  0.217 ฮฉ

D.ย  45 ฮฉ

Solution:

161.ย  REE Board Exam September 2000

Twoย  10-ฮฉย  resistancesย  areย  connectedย  inย  parallel. Theย  twoย  areย  thenย  connectedย  inย  seriesย  withย  aย  5-ฮฉ resistance.ย  Itย  isย  thenย  connectedย  acrossย  aย  24-volt battery; find the voltage across the 5-ฮฉ resistor.

A.ย  12 volts

B.ย  24 volts

C.ย  9 volts

D.ย  15 volts

Solution:

162.ย  REE Board Exam April 1997

Aย  circuitย  consistsย  ofย  threeย  resistorsย  ratedย  3-ฮฉ,ย  4-ฮฉ andย  5-ฮฉย  connectedย  inย  parallel.ย  Ifย  theย  circuitย  is connectedย  toย  aย  batteryย  whichย  hasย  anย  internal resistanceย  ofย  0.2-ฮฉ,ย  whatย  wouldย  beย  theย  current through the 4-ฮฉ resistor?

A.ย  2.04 A

B.ย  4.8 A

C.ย  2.4 A

D.ย  3.0 A

Solution:

163.ย  REE Board Exam September 2000

How many abvolts in 1 volt?

A.ย  108 abvolts

B.ย  10-8 abvolts

C.ย  1 abvolt

D.ย  10 abvolt

Solution:

164.ย  REE Board Exam September 2003

Aย  totalย  current of 60ย  Aย  is divided among 3ย  parallel branches having resistances of 10 ฮฉ, 6 ฮฉ and 12 ฮฉ, respectively. What is the current that flows through the branch with 10 ฮฉ resistance?

A.ย  17.1 A

B.ย  28.6 A

C.ย  14.3 A

D.ย  42.9 A

Solution:

165.ย  REE Board Exam October 2000

Twoย  10-ohmย  parallelย  resistorsย  areย  connectedย  in seriesย  withย  aย  5-ohmย  resistor.ย  Theย  combinationย  is then connected across a 24 volts battery. Find the voltage drop across the 5-ohm resistor.

A.ย  6 V

B.ย  18 V

C.ย  12 V

D.ย  20 V

Solution:

166.ย  ECE Board Exam November 1998

Theย  theoryย  ofย  Ohmโsย  lawย  isย  appliedย  inย  aย  _____ circuit.

A.ย  linear

B.ย  exponential

C.ย  trivalent

D.ย  unilateral

Solution:

167.ย  ECE Board Exam April 2000

Refersย  toย  theย  mostย  importantย  componentsย  in controlling flow of electrons

A.ย  voltage, electromotive force and current

B.ย  reactance, current and resistance

C.ย  conductance, resistance and reactance

D.ย  voltage, resistance and current

Solution:

168.ย  ECE Board Exam November 1999

Whichย  ofย  theย  followingย  isย  notย  aย  validย  expressionย  of ohmโs law?

A.ย  E = IR

B.ย  R = PI

C.ย  R = E/I

D.ย  I = E/R

Solution:

169.ย  ECE Board Exam November 2000

Aย  simpleย  electronicย  equipmentย  whichย  takesย  aย  2 amperesย  currentย  fromย  aย  powerย  sourceย  hasย  aย  total loadย  resistanceย  ofย  100ย  ohms.ย  Howย  muchย  power does it use?

A.ย  200 watts

B.ย  100 watts

C.ย  400 watts

D.ย  50 watts

Solution:

170.ย  ECE Board Exam November 1996

Whatย  doย  youย  expectย  whenย  youย  useย  theย  twoย  20 kohms, 1 watt resistor in parallel instead of one 10 kohms, 1 watt?

A.ย  Provide lighter current

B.ย  Provide wider tolerance

C.ย  Provide more power

D.ย  Provide less power

Solution:

171.ย  ECE Board Exam November 1999

The total resistance of a two similar wire conductors connected in parallel is ______

A.ย  same resistance of one wire

B.ย  double the resistance of one wire

C.ย  one half the resistance of one wire

D.ย  resistance of one wire multiplied by 4

Solution:

172.ย  ECE Board Exam March 1996

Whenย  youย  increaseย  theย  resistanceย  inย  aย  circuit,ย  the flow of electrons will ______.

A.ย  be constant

B.ย  flow faster

C.ย  be stopped

D.ย  be decreased

Solution:

173.ย  ECE Board Exam April 2001

Which of the following allows more current if applied to the same voltage?

A.ย  0.002 siemen

B.ย  25 ohms

C.ย  0.004 siemen

D.ย  2.5 ohms

Solution:

174.ย  ECE Board Exam April 1998

Ohmโs law refers to _____.

A.ย  powerย  isย  directlyย  proportionalย  toย  bothย  voltage squared and the resistance

B.ย  power is directly proportional to the resistance and inversely as the current squared

C.ย  currentย  variesย  directlyย  asย  theย  voltageย  and inversely as the resistance

D.ย  currentย  isย  directlyย  proportionalย  toย  bothย  voltage and resistance

Solution:

175.ย  ECE Board Exam November 2000

Aย  circuitย  whichย  aย  breakย  existsย  inย  theย  complete conduction pathway

A.ย  Open circuit

B.ย  Short circuit

C.ย  Close circuit

D.ย  Circuit

Solution:

176.ย  ECE Board Exam November 1997

How much is the equivalent power in watts can a 3 horse power provide?

A.ย  3000 watts

B.ย  248.66 watts

C.ย  1492 watts

D.ย  2238 watts

Solution:

177.ย  ECE Board Exam March 1996

Theย  currentย  neededย  toย  operateย  aย  solderingย  iron which has a rating of 600 watts at 110 volts is

A.ย  18,200 A

B.ย  0.182 A

C.ย  66,000 A

D.ย  5.455 A

Solution:

178.ย  ECE Board Exam November 1997

Findย  theย  powerย  acrossย  theย  resistorย  ofย  5ย  ohms delivered from a battery of an internal resistance of 3 ohms and a constant emf of 4 volts.

A.ย  120 watts

B.ย  100 watts

C.ย  60 watts

D.ย  1.25 watts

Solution:

179.ย  ECE Board Exam April 2000

Aย  seriesย  circuitย  inย  whichย  desiredย  portionsย  ofย  the sourceย  voltageย  mayย  beย  tappedย  offย  forย  use equipment.

A.ย  Voltage trap

B.ย  Voltage selector

C.ย  Voltage divider

D.ย  Dividing network

Solution:

180.ย  ECE Board Exam April 1998

Anย  electronicย  deviceย  drawsย  300ย  wattsย  fromย  itsย  24 volt power source. Find effective resistance.

A.ย  1.25 ฮฉ

B.ย  1.92 ฮฉ

C.ย ย  19.20 ฮฉ

D.ย  12.50 ฮฉ

Solution:

181.ย  ECE Board Exam November 1997

Howย  muchย  powerย  doesย  anย  electronicย  equipment consume, assuming a 5.50 amperes current flowing and a 120 volts power source?

A.ย  125.5 watts

B.ย  66 watts

C.ย  660 watts

D.ย  60 watts

Solution:

182.ย  ECE Board Exam March 1996

What type of circuit whose parameters are constant which do not change with voltage or current?

A.ย  Tuned circuit

B.ย  Linear circuit

C.ย  Reactive circuit

D.ย  Lumped circuit

Solution:

183.ย  ECE Board Exam April 2000

If three circuits, each with a value of 560 ohms are connected in parallel, what is the total resistance of the combination?

A.ย  1680 ohms

B.ย  560 ohms

C.ย  18567 ohms

D.ย  187 0hms

Solution:

184.ย  ECE Board Exam November 1997

Otherย  factorsย  remainingย  constant,ย  whatย  wouldย  be the effect on the current flow in a given circuit if the applied potential were doubled?

A.ย  It would double

B.ย  It would increase 4 times

C.ย  It would remain the same

D.ย  It would be decrease by ยฝ

Solution:

185.ย  ECE Board Exam April 1999

Findย  usedย  powerย  ofย  aย  circuitย  whoseย  powerย  source suppliesย  20ย  voltsย  andย  aย  loadย  resistanceย  ofย  200 ohms.

A.ย  1 watt

B.ย  4 kilowatts

C.ย  10 watts

D.ย  2 watts

Solution:

186.ย  ECE Board Exam April 1998

Whenย  resistorsย  areย  connectedย  inย  series,ย  what happens?

A.ย  Nothing

B.ย  The tolerance is decreased

C.ย  The effective resistance is decreased

D.ย  The effective resistance is increased

Solution:

187.ย  ECE Board Exam November 1999

A condition in which the heat in of around the circuit increases beyond or to a higher than normal level.

A.ย  Excessive heat condition

B.ย  Open condition

C.ย  Direct short

D.ย  Grounded

Solution:

188.ย  ECE Board Exam November 1999

Aย  33ย  kiloย  ohmsย  resistorย  isย  connectedย  inย  aย  series parallelย  combinationย  madeย  upย  ofย  aย  56ย  kiloย  ohm resistorย  andย  aย  7.8ย  kiloย  ohmย  resistor.ย ย  Whatย  isย  the total combined resistance of these three resistors?

A.ย  39067 ohms

B.ย  49069 ohms

C.ย  63769 ohms

D.ย  95800 ohms

Solution:

189.ย  ECE Board Exam April 2001

Ifย  3,300ย  ohmsย  resistorย  andย  a 22,000ย  ohmsย  resistor areย  connectedย  inย  series,ย  whatย  isย  theย  total resistance?

A.ย  18,700 ohms

B.ย  25,300 ohms

C.ย  5,500 ohms

D.ย  2,870 ohms

Solution:

190.ย  ECE Board Exam November 2000

A device that draws current

A.ย  Source

D.ย  Shunt

Solution:

191.ย  ECE Board Exam April 1998

Withย  theย  sameย  voltageย  appliedย  whichย  ofย  the following allows more current?

A.ย  25 ohms

B.ย  250 ohms

C.ย  2.5 ohms

D.ย  0.25 ohms

Solution:

192.ย  ECE Board Exam April 1998

If 12 V are applied to a circuit that consumes 78 W, what is the current flow through the circuits?

A.ย  6.5 A

B.ย  936 A

C.ย  0.15 A

D.ย  9.36 A

Solution:

193.ย  ECE Board Exam April 1998

Find the current that flows through the filament of a 400 watt flat iron connected to a 220 volt power line.

A.ย  50 mA

B.ย  500 mA

C.ย  5 mA

D.ย  5 A

Solution:

194.ย  Fourย  equalย  resistancesย  areย  connectedย  inย  parallel acrossย  aย  certainย  supplyย  producingย  Pย  power.ย  How much power will be produced if the resistances are now connected in series across the same supply?

A.ย  16P

B.ย  P/16

C.ย  4P

D.ย  P/4

Solution:

195.ย  A resistor R is connected across a 120 V supply. A voltmeterย  ofย  10,000ย  ohmsย  resistanceย  isย  connected between the center of the resistor and oneย  side of the supply and reads 40 V. What is the value of the resistance R?

A.ย  10,000 ฮฉ

B.ย  20,000 ฮฉ

C.ย  30,000 ฮฉ

D. 40,000 ฮฉ

Solution:

196.ย  Aย  240ย  Vย  motorย  requiringย  2,000ย  Wย  isย  locatedย  1ย  km from a power source. What diameter of copper wire is to be used if the power loss is to be kept 5%?

A.ย  0.49 cm

B.ย  0.54 cm

C.ย  0.39 cm

D.ย  0.35 cm

Solution:

197.ย  Three resistors of 10, 12 and โxโ ohms, respectively are connected in parallel across a constant current sourceย  ofย  8ย  A.ย  Determineย  โxโย  ifย  thisย  resistorย  draws 2.5 A.

A.ย  10 ฮฉ

B.ย  12 ฮฉ

C.ย  13 ฮฉ

D.ย  11 ฮฉ

Solution:

198.ย  An arc lamp takes 10 A at 50 volts. A resistance R isย  toย  beย  placeย  inย  seriesย  soย  thatย  theย  lampย  myย  burn correctlyย  fromย  aย  110ย  Vย  supply.ย  Findย  theย  power wasted in this resistor.

A.ย  800 watts

B.ย  600 watts

C.ย  700 watts

D.ย  900 watts

Solution:

199.ย  A 20 ฮฉย  and 10 ฮฉย  resistors are connected in parallel andย  aย  5ย  ฮฉย  resistorย  isย  connectedย  inย  seriesย  withย  the parallelย  combination.ย  Theย  circuitย  isย  connected across a 48 V source with an internal resistance of 0.2ย  ฮฉ. Calculateย  theย  currentย  throughย  theย  5ย  ฮฉ resistor.

A.ย  5.57 amperes

B.ย  4.04 amperes

C.ย  3.58 amperes

D.ย  7.63 amperes

Solution:

200.ย  A variable resistor R is connected in parallel with a fixed resistor of 1.25 ohms. The combination is then connectedย  acrossย  aย  12ย  Vย  batteryย  withย  internal resistance of 0.25 โฆ. Solve for the maximum power that can delivered to R.

A.ย  130.20 W

B.ย  115.52 W

C.ย  120.21 W

D.ย  142.42 W

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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