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

OHMโS LAW AND ELECTRIC CIRCUITS

**Choose the letter of the best answer in each questions.**

โ MCQ in DC Circuits Part 5 | REE Board Exam

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

A.ย powers are additive

B.ย voltages are additive

C.ย current additive

D.ย elements have individual currents

Answer: **Option A**

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

Answer: **Option A**

Solution:

253.ย Inย theย parallelย circuitย ofย Fig.1.3,ย theย valueย ofย V_{0}ย is _____ volt.

A.ย 12

B.ย 24

C.ย 0

D.ย -12

Answer: **Option C**

Solution:

254.ย Inย theย seriesย circuitย ofย Figย 1.4,ย theย valueย ofย V_{0}ย is ____ volt.

A.ย 12

B.ย -12

C.ย 0

D.ย 6

Answer: **Option D**

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

Answer: **Option C**

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

Answer: **Option D**

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

Answer: **Option A**

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

Answer: **Option B**

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

Answer: **Option D**

Solution:

260.ย Whatย doย youย callย aย resistorย thatย doesย notย obey Ohmโs Law?

A.ย Potentiometer

B.ย Carbon-Film Resistor

C.ย Wire-Wound Type

D.ย Non-linear Resistor

Answer: **Option D**

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

Answer: **Option B**

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

Answer: **Option B**

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%

Answer: **Option B**

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

Answer: **Option A**

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

Answer: **Option A**

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%

Answer: **Option A**

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

Answer: **Option D**

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

Answer: **Option A**

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

Answer: **Option C**

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

Answer: **Option D**

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

Answer: **Option A**

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

Answer: **Option C
**

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

Answer: **Option C**

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

Answer: **Option A**

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

Answer: **Option A**

Solution:

276.ย REE Board Exam September 2001

10^{13} ergs/sec is equal to how many kilowatts?

A.ย 1,000

B.ย 250

C.ย 100

D.ย 10

Answer: **Option A**

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

Answer: **Option B**

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 10^{5}

B.ย 9.8 x 10^{7}

C.ย 98 x 10^{7}

D.ย 1.96 x 10^{7}

Answer: **Option B**

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

Answer: **Option C**

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 Boyleโs law

C.ย Specific heat

D.ย Isothermal expansion

Answer: **Option A**

Solution:

281.ย REE Board Exam September 2002

What is 10^{12} ergs/sec in kW?

A.ย 100 kW

B.ย 1,000 kW

C.ย 10 kW

D.ย 10,000 kW

Answer: **Option A**

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

Answer: **Option B**

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

Answer: **Option B**

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

Answer: **Option C**

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

Answer: **Option B**

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

Answer: **Option B**

Solution:

287.ย The basic unit of electric charge is

A.ย ampere-hour

B.ย watt-hour

C.ย coulomb

D.ย farad

Answer: **Option C**

Solution:

288.ย The SI unit of energy is

A.ย Joule

B.ย kWh

C.ย kcal

D.ย m-kg

Answer: **Option A**

Solution:

289.ย The SI unit of energy is

A.ย Joule

B.ย kWh

C.ย kcal

D.ย m-kg

Answer: **Option A**

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

Answer: **Option C**

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

Answer: **Option C**

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

Answer: **Option A**

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

Answer: **Option C**

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

Answer: **Option B**

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

Answer: **Option D**

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

Answer: **Option A**

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

Answer: **Option B**

Solution:

298.ย One watt is equal to ____.

A.ย 4.19 cal/sec

B.ย 778 BTU/sec

C.ย 10^{7} ergs/sec

D.ย 10^{-7} ergs/sec

Answer: **Option C**

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

Answer: **Option D**

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

Answer: **Option A**

Solution:

โ MCQ in DC Circuits Part 7 | REE Board Exam

#### Questions and Answers in DC Circuits

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

**MCQ in DC Circuits**

**MCQ from Number 1 โ 50**Answer key:

**included**

**MCQ from Number 51 โ 100**Answer key:

**included**

**MCQ from Number 101 โ 150**Answer key:

**included**

**MCQ from Number 151 โ 200**Answer key:

**included**

**MCQ from Number 201 โ 250**Answer key:

**included**

**MCQ from Number 251 โ 300**Answer key:

**included**

**MCQ from Number 301 โ 350**Answer key:

**included**

**MCQ from Number 351 โ 400**Answer key:

**included**

**MCQ from Number 401 โ 450**Answer key:

**included**

**MCQ from Number 451 โ 500**Answer key:

**included**

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