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

OHMโS LAW AND ELECTRIC CIRCUITS

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

โ MCQ in DC Circuits Part 3 | REE Board Exam

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

Answer: **Option B**

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

Answer: **Option 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

Answer: **Option D**

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

Answer: **Option A**

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

Answer: **Option A**

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

Answer: **Option A**

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

Answer: **Option B**

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

Answer: **Option C
**

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

Answer: **Option B**

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

Answer: **Option B**

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

Answer: **Option A**

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

Answer: **Option D**

Solution:

163.ย REE Board Exam September 2000

How many abvolts in 1 volt?

A.ย 10^{8} abvolts

B.ย 10-8 abvolts

C.ย 1 abvolt

D.ย 10 abvolt

Answer: **Option A**

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

Answer: **Option 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

Answer: **Option C**

Solution:

166.ย ECE Board Exam November 1998

Theย theoryย ofย Ohmโsย lawย isย appliedย inย aย _____ circuit.

A.ย linear

B.ย exponential

C.ย trivalent

D.ย unilateral

Answer: **Option A**

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

Answer: **Option D**

Solution:

168.ย ECE Board Exam November 1999

Whichย ofย theย followingย isย notย aย validย expressionย of ohmโs law?

A.ย E = IR

B.ย R = PI

C.ย R = E/I

D.ย I = E/R

Answer: **Option B**

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

Answer: **Option C**

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

Answer: **Option C**

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

Answer: **Option C**

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

Answer: **Option D**

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

Answer: **Option D**

Solution:

174.ย ECE Board Exam April 1998

Ohmโs 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

Answer: **Option C**

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

Answer: **Option A**

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

Answer: **Option D**

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

Answer: **Option D**

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

Answer: **Option D**

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

Answer: **Option C**

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

Answer: **Option B**

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

Answer: **Option C**

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

Answer: **Option B**

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

Answer: **Option D**

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

Answer: **Option A**

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

Answer: **Option D**

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

Answer: **Option D**

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

Answer: **Option A**

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

Answer: **Option A**

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

Answer: **Option B**

Solution:

190.ย ECE Board Exam November 2000

A device that draws current

A.ย Source

B.ย No load

C.ย Load

D.ย Shunt

Answer: **Option C**

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

Answer: **Option D**

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

Answer: **Option 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

Answer: **Option B**

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

Answer: **Option B**

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

Answer: **Option B**

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

Answer: **Option B**

Solution:

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

A.ย 10 ฮฉ

B.ย 12 ฮฉ

C.ย 13 ฮฉ

D.ย 11 ฮฉ

Answer: **Option B**

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

Answer: **Option B**

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

Answer: **Option B**

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 โฆ. 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

Answer: **Option C**

Solution:

โ MCQ in DC Circuits Part 5 | 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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