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# MCQ in DC Circuits Part 6 | REE Board Exam

This is the Multiple Choice Questions Part 6 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 6 of the Series

OHMโS LAW AND ELECTRIC CIRCUITS

Choose the letter of the best answer in each questions.

251.ย  Which of the following statement is TRUE both for a series and parallel d.c circuit?

D.ย  elements have individual currents

Solution:

252.ย  A 100-W, 110-V and a 50-W lamp are connected in series across a 220-V dc source. If the resistances of the two lamps are assumed to remain constant, the voltage across the 100-W lamp is ____ volt.

A.ย  110

B.ย  73.3

C.ย  146.7

D.ย  220

Solution:

253.ย  Inย  theย  parallelย  circuitย  ofย  Fig.1.3,ย  theย  valueย  ofย  V0ย  is _____ volt.

A.ย  12

B.ย  24

C.ย  0

D.ย  -12

Solution:

254.ย  Inย  theย  seriesย  circuitย  ofย  Figย  1.4,ย  theย  valueย  ofย  V0ย  is ____ volt.

A.ย  12

B.ย  -12

C.ย  0

D.ย  6

Solution:

255.ย  In Fig 1.5, there is a drop of 20 V on each resistor. The potential of point A would be ____ volt.

A.ย  +80

B.ย  -40

C.ย  +40

D.ย  -80

Solution:

256.ย  From the voltmeter reading of Fig. 1.6, is it obvious that

A.ย  the 3 ฮฉ resistor is short circuited

B.ย  the 6 ฮฉ resistor is short circuited

C.ย  nothing is wrong with the circuit

D.ย  the 3 ฮฉ resistor is open-circuited

Solution:

257.ย  Withย  referenceย  toย  Figย  1.7,ย  whichย  ofย  theย  following statement is true?

A.ย  E and R1 form a series circuit

B.ย  R1 is in series with R3

C.ย  R1 is in series with R2

D.ย  there is no series circuit

Solution:

258.ย  Whichย  ofย  theย  followingย  statementsย  isย  correct concerning the Fig. 1.8?

A.ย  R2 and R3 form a series of path

B.ย  E is in series with R1

C.ย  R1 is in parallel in R3

D.ย  R1, R2 and R3 form a series of circuit

Solution:

259.ย  What is the equivalent resistance in ohms between pointsย  Aย  andย  Bย  ofย  Fig.ย  1.9?ย  Allย  resistancesย  areย  in ohms.

A.ย  12

B.ย  14.4

C.ย  22

D.ย  2

Solution:

260.ย  Whatย  doย  youย  callย  aย  resistorย  thatย  doesย  notย  obey Ohmโs Law?

A.ย  Potentiometer

B.ย  Carbon-Film Resistor

C.ย  Wire-Wound Type

D.ย  Non-linear Resistor

Solution:

261.ย  Aย  100ย  W,ย  110ย  Vย  andย  50ย  W,ย  110ย  Vย  lampsย  are connected in series across a 220 V DC source. If theย  resistancesย  ofย  theย  twoย  lampsย  areย  assumedย  to remain constant, the voltage across the 100 W lamp is _____ volt?

A.ย  110 V

B.ย  73.3 V

C.ย  146.7 V

D.ย  220 V

Solution:

262.ย  Aย  potentialย  dividerย  ofย  resistanceย  ofย  50ย  ohmsย  is connectedย  acrossย  aย  100ย  Vย  DCย  source.ย  Aย  load resistance of 10 ohms is connected across a tap in the potential divider and the negative terminal of the source.ย  Ifย  aย  currentย  ofย  4ย  Aย  flowsย  towardsย  theย  load, what is the current supplied by the source?

A.ย  5.32 A

B.ย  5.05 A

C.ย  5.21 A

D.ย  5.48 A

Solution:

263.ย  Twoย  resistorsย  Aย  andย  Bย  madeย  ofย  differentย  materials have temperature coefficients of resistance at 20ยฐC ofย  0.004ย  andย  0.006ย  respectively.ย  Whenย  connected across a voltage sourceย  at 20ยฐC, they draw current equally. Whatย  percentageย  ofย  theย  totalย  currentย  at 100ยฐC does resistor A carry?

A.ย  47.14%

B.ย  52.86%

C.ย  61.34%

D.ย  38.66%

Solution:

264.ย  A conductor has a resistance of 7 ohms at 0ยฐC. At 20ยฐC,ย  theย  resistanceย  hasย  becomeย  7.5ย  ohms. Calculateย  theย  temperatureย  coefficientย  ofย  the conductor at 20ยฐC.

A.ย  1/300 /ยฐC

B.ย  1/400 /ยฐC

C.ย  1/500 /ยฐC

D.ย  1/600 /ยฐC

Solution:

265.ย  Which of the following is a non-linear element?

A.ย ย ย  diode

B.ย ย ย  heater coil

C.ย  transistor

D.ย  electric arc with unlike electrode

Solution:

ELECTRICAL AND HEAT ENERGY

266.ย  EE Board Exam April 1992

An electric kettle was marked 500 W, 230 V found toย  takeย  15ย  minutesย  toย  bringย  1ย  kilogramย  ofย  waterย  at 15ยฐC to boiling point. Determine the heat efficiency of the kettle.

A.ย  79.1%

B.ย  75.3%

C.ย  72.4%

D.ย  74.8%

Solution:

267.ย  REE Board Exam October 1997

A process equipment contains 100 gallons of water atย  25ยฐC.ย  Itย  isย  requiredย  toย  bringย  itย  toย  boilingย  inย  10 minutes. The heat loss is estimated to be 5%. What is the kW rating of the heater?

A.ย  125 kW

B.ย  252 kW

C.ย  50.5 kW

D.ย  207 kW

Solution:

268.ย  EE October 1989

A total of 0.8 kg of water at 20ยฐC is placed in a 1-kW electric kettle. How long a time in minute is needed to raise the temperature of the water to 100ยฐC?

A.ย  4.46 min

B.ย  5.32 min

C.ย  5.34 min

D.ย  4,.56 min

Solution:

269.ย  REE October 1998

Howย  manyย  caloriesย  doesย  anย  electricย  heaterย  ofย  100 watts generate per second?

A.ย  10

B.ย  1000

C.ย  23.88

D.ย  42.25

Solution:

270.ย  REE Board Exam October 1997

Theย  electricย  energyย  requiredย  toย  raiseย  the temperature of water in a pool is 1000 kWh. If the heatย  lossesย  areย  25%,ย  theย  heatingย  energyย  required will be ______.

A.ย  1111 kWh

B.ย  1266 kWh

C.ย  1750 kWh

D.ย  1333 kWh

Solution:

271.ย  EE Board Exam April 1992

Anย  electricย  heaterย  carriesย  12ย  Aย  atย  110ย  V,ย  is submergedย  inย  22.5ย  lbsย  ofย  waterย  forย  30ย  minutes. What will be the final temperature of the water if its initial temperature is 35ยฐF?

A.ย  135.43ยฐF

B.ย  125.42ยฐF

C.ย  133.56ยฐF

D.ย  128.33ยฐF

Solution:

272.ย  EE Board Exam October 1990

Inย  anย  electric heaterย  theย  inlet temperatureย  isย  15ยฐC. Waterย  isย  flowingย  atย  theย  rateย  ofย  300ย  gramsย  per minute. The voltmeter measuring voltage across the heatingย  elementย  readsย  120ย  voltsย  andย  anย  ammeter measuringย  currentย  takenย  readsย  10ย  amperes. When steadyย  stateย  isย  finallyย  reached,ย  whatย  isย  theย  final reading of the outlet thermometer?

A.ย  57.6ยฐC

B.ย  68.4ยฐC

C.ย  72.6ยฐC

D.ย  42.6ยฐC

Solution:

273.ย  EE Board Exam October 1991

Fourย  cubicย  metersย  ofย  waterย  isย  toย  beย  heatedย  by meansย  ofย  fourย  1.5ย  kW,ย  230-Vย  immersionย  heating elements. Assuming the efficiency of the heater as 90%,ย  determineย  theย  timeย  requiredย  inย  boilingย  the water if the initial temperature is 20ยฐC and if all four elements are connected in parallel.

A.ย  71 hrs

B.ย  63 hrs

C.ย  69 hrs

D.ย  66 hrs

Solution:

274.ย  EE Board Exam October 1991

Fourย  cubicย  metersย  ofย  waterย  isย  toย  beย  heatedย  by meansย  ofย  fourย  1.5ย  kW,ย  230-Vย  immersionย  heating elements. Assuming the efficiency of the heater as 90%,ย  determineย  theย  timeย  requiredย  inย  boilingย  the waterย  ifย  theย  initialย  temperatureย  isย  20ยฐCย  andย  ifย  the elementsย  areย  connectedย  twoย  inย  seriesย  inย  parallel with two in series.

A.ย  275.6 hrs

B.ย  295.3 hrs

C.ย  252.2 hrs

D.ย  264.4 hrs

Solution:

275.ย  REE Board Exam September 2001

How many joules per second are then in 10 watts?

A.ย  10

B.ย  5

C.ย  20

D.ย  24.5

Solution:

276.ย  REE Board Exam September 2001

1013 ergs/sec is equal to how many kilowatts?

A.ย  1,000

B.ย  250

C.ย  100

D.ย  10

Solution:

277.ย  REE Board Exam September 2000

What is 1 kW-hr in BTU?

A.ย  4,186

B.ย  3,413

C.ย  746

D.ย  1,000

Solution:

278.ย  REE Board Exam October 1998

Whatย  isย  theย  workย  inย  ergsย  neededย  toย  raiseย  aย  10ย  g weight 100 m up?

A.ย  4.9 x 105

B.ย  9.8 x 107

C.ย  98 x 107

D.ย  1.96 x 107

Solution:

279.ย  REE Board Exam October 1999

Theย  quantityย  ofย  heatย  requiredย  toย  raiseย  the temperature of water by 1ยฐC.

A.ย  energy

B.ย  specific heat

C.ย  calorie

D.ย  BTU

Solution:

280.ย  REE Board Exam October 1999

Whenย  heatย  isย  transferredย  intoย  anyย  otherย  formย  of energy or when other forms of energy are converted intoย  heat,ย  theย  totalย  amountย  ofย  energyย  isย  constant. This is known as

A.ย  First law of thermodynamics

B.ย  Boyleโs law

C.ย  Specific heat

D.ย  Isothermal expansion

Solution:

281.ย  REE Board Exam September 2002

What is 1012 ergs/sec in kW?

A.ย  100 kW

B.ย  1,000 kW

C.ย  10 kW

D.ย  10,000 kW

Solution:

282.ย  REE Board Exam October 2000

An electric heater isย  used to heat up 600 grams of water. It takes 14 minutes to raise the temperature of water by 40ยฐC. If the supply voltage is 220 volts, whatย  isย  theย  powerย  ratingย  ofย  theย  heaterย  neglecting heat losses?

A.ย  180 W

B.ย  120 W

C.ย  200 W

D.ย  60 W

Solution:

283.ย  REE Board Exam April 2001

Aย  100ย  literย  ofย  waterย  isย  heatedย  fromย  20ยฐCย  toย  40ยฐC. How many kWHR of electricity is needed assuming no heat loss?

A.ย  4.2

B.ย  2.3

C.ย  5.6

D.ย  3.7

Solution:

284.ย  REE Board Exam April 2002

Ten (10) kW is equal to ____ gram-cal/sec.

A.ย  156

B.ย  436

C.ย  2,388

D.ย  425

Solution:

285.ย  ECE Board Exam November 1995

Two heaters A and B are in parallel across supply voltageย  V.ย ย  Heaterย  Aย  producesย  500ย  kcalย  inย  20 minutesย  andย  Bย  producesย  1000ย  kcalย  inย  10ย  minutes. Theย  resistanceย  ofย  Aย  isย  10ย  ohms.ย ย  Whatย  isย  the resistance of B, if the same heaters are connected in series voltage V?

A.ย  4.5 ohms

B.ย  2.5 ohms

C.ย  4.5 ohms

D.ย  0.14 ohm

Solution:

286.ย  In the SI system of units, the unit of force is

A.ย  kg-wt

B.ย  Newton

C.ย  Joule

D.ย  N-m

Solution:

287.ย  The basic unit of electric charge is

A.ย  ampere-hour

B.ย  watt-hour

C.ย  coulomb

Solution:

288.ย  The SI unit of energy is

A.ย  Joule

B.ย  kWh

C.ย  kcal

D.ย  m-kg

Solution:

289.ย  The SI unit of energy is

A.ย  Joule

B.ย  kWh

C.ย  kcal

D.ย  m-kg

Solution:

290.ย  Two heating elements, each of 230-V, 3.5 kW rating are first joined in parallel and then in series to heat sameย  amountย  ofย  waterย  throughย  theย  sameย  rangeย  of temperature. The ratio of the time taken in the two cases would be

A.ย  1:2

B.ย  2:1

C.ย  1:4

D.ย  4:1

Solution:

291.ย  Ifย  aย  220ย  Vย  heaterย  isย  usedย  onย  110ย  Vย  supply,ย  heat produced by it will be ____ as much

A.ย  one-half

B.ย  twice

C.ย  one-fourth

D.ย  four times

Solution:

292.ย  Forย  aย  givenย  lineย  voltage,ย  fourย  heatingย  coilsย  will produce maximum heat when connected

A.ย  all in parallel

B.ย  all in series

C.ย  with two parallel pairs in series

D.ย  one pair in parallel with the other two in series

Solution:

293.ย  Theย  electricย  energyย  requiredย  toย  raiseย  the temperatureย  ofย  aย  givenย  amountย  ofย  waterย  isย  1000 kWh.ย  Ifย  heatย  lossesย  areย  25%,ย  theย  totalย  heating energy required is ____ kWh.

A.ย  1500

B.ย  1250

C.ย  1333

D.ย  1000

Solution:

294.ย  One kWh of energy equals nearly

A.ย  1000 W

B.ย  860 kcal

C.ย  4186 J

D.ย  735.5 W

Solution:

295.ย  A force of 10,000 N accelerates a body to velocity 0.1 km/s. The power developed is ____ kW.

A.ย  1,000,000

B.ย  36,000

C.ย  3600

D.ย  1000

Solution:

296.ย  A 100 W light bulb burns on an average of 10 hours aย  dayย  forย  oneย  week.ย  Theย  weeklyย  consumptionย  of energy will be ____ unit/s.

A.ย  7

B.ย  70

C.ย  0.7

D.ย  0.07

Solution:

297.ย  Two heaters, rated at 1000 W, 250 volts each, are connectedย  inย  seriesย  acrossย  aย  250ย  volt,ย  50ย  Hzย  A.C. mains.ย  Theย  totalย  powerย  drawnย  fromย  theย  supply would be ____ watt.

A.ย  1000

B.ย  500

C.ย  250

D.ย  2000

Solution:

298.ย  One watt is equal to ____.

A.ย  4.19 cal/sec

B.ย  778 BTU/sec

C.ย  107 ergs/sec

D.ย  10-7 ergs/sec

Solution:

299.ย  The current in an electric lamp is 5 amperes. What quantity of electricity flows toward the filament in 6 minutes?

A.ย  30 C

B.ย  3600 C

C.ย  72 C

D.ย  1800 C

Solution:

300.ย  Anย  electric heater is rated at 120 volts, 1000 watts andย  isย  usedย  toย  boilย  water.ย  Calculateย  theย  timeย  in minutes to raise the temperature of 1 liter of water fromย  15ยฐCย  toย  boiling.ย  Theย  heaterย  hasย  anย  over-all efficiency of 92%.

A.ย  6.4 minutes

B.ย  5.4 minutes

C.ย  4.4 minutes

D.ย  3.4 minutes

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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