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# MCQ in DC Circuits Part 3 | REE Board Exam

This is the Multiple Choice Questions Part 3 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.

DC CIRCUITS: BASIC PRINCIPLES

#### Continue Practice Exam Test Questions Part 3 of the Series

Choose the letter of the best answer in each questions.

101.ย  Aย  certainย  wireย  20ย  ftย  longย  and 100ย  circularย  mil area has a resistance of 1.6 ฮฉ. What is its resistivity?

A.ย  10.3 ohm-CM/ft

B.ย  2.2 ohm-CM/ft

C.ย  8 ohm-CM/ft

D.ย  15.2 ohm-CM/ft

Solution:

102.ย  How many circular mils does a round copper rod of 0.25 inch diameter have?

A.ย  196,000

B.ย  62,500

C.ย  1,963,500

D.ย  49,000

Solution:

103.ย  A substance whose molecules consist of the same kind of atoms is called ______.

A.ย  mixture

B.ย  element

C.ย  compound

D.ย  none of these

Solution:

104.ย  The diameter of the atom is about ______.

A.ย  10-10 m

B.ย  10-8 m

C.ย  10-2 m

D.ย  10-15 m

Solution:

105.ย  Theย  numberย  ofย  compoundsย  availableย  inย  natureย  is ______.

A.ย  105

B.ย  300

C.ย  1000

D.ย  unlimited

Solution:

106.ย  Theย  massย  ofย  aย  protonย  isย  ____ย  theย  massย  ofย  an electron.

A.ย  equal to

B.ย  less than

D.ย  200 times

Solution:

107.ย  Theย  maximumย  numberย  ofย  electronsย  thatย  canย  be accommodated in the last orbit is ____.

A.ย  4

B.ย  8

C.ย  18

D.ย  2

Solution:

108.ย  The electrons in the last orbit of an atom are called _____ electrons.

A.ย  free

B.ย  bound

C.ย  valence

D.ย  thermionic

Solution:

109.ย  Ifย  theย  numberย  ofย  valenceย  electronsย  ofย  anย  atomย  is less than 4, the substance is usually ____.

A.ย  a conductor

B.ย  an insulator

C.ย  a semiconductor

D.ย  none of these

Solution:

110.ย  Ifย  theย  numberย  ofย  valenceย  electronsย  ofย  anย  atomย  is more than 4, the substance is usually ____.

A.ย  a semiconductor

B.ย  a conductor

C.ย  an insulator

D.ย  none of these

Solution:

111.ย  Ifย  theย  numberย  ofย  valenceย  electronsย  ofย  anย  atomย  is exactly 4, the substance is usually ____.

A.ย  a semiconductor

B.ย  an insulator

C.ย  a conductor

D.ย  a semiconductor

Solution:

112.ย  The number of valence electrons of an atom is less than 4. The substance will be probably ____.

A.ย  a metal

B.ย  a non-metal

C.ย  an insulator

D.ย  a semiconductor

Solution:

113.ย  Oneย  coulombย  ofย  chargeย  isย  equalย  toย  theย  chargeย  on ____ electrons.

A.ย  628 x 1016

C.ย  62.8 x 1016

B.ย  6.28 x 1016

D.ย  0.628 x 1016

Solution:

114.ย  Oneย  cc of copper has about _____ free electrons at room temperature.

A.ย  200

B.ย  20 x 1010

C.ย  8.5 x 1022

D.ย  3 x 105

Solution:

115.ย  Electric current in a wire is the flow of ______.

A.ย  free electrons

B.ย  bound electrons

C.ย  valence electrons

D.ย  atoms

Solution:

116.ย  EMF in a circuit is ______.

A.ย  cause current to flow

B.ย  maintains potential difference

C.ย  increases the circuit resistance

D.ย  none of these

Solution:

117.ย  EMF has the unit of _____.

A.ย  power

B.ย  energy

C.ย  charge

D.ย  none of these

Solution:

118.ย  Potential difference has the unit of _____.

A.ย  charge

B.ย  power

C.ย  energy

D.ย  none of these

Solution:

119.ย  Theย  resistanceย  ofย  aย  materialย  isย  ____ย  itsย  areaย  of cross-section.

A.ย  directly proportional to

B.ย  inversely proportional to

C.ย  independent of

D.ย  none of these

Solution:

120.ย  If the length and area ofย  cross-section of a wire are doubled up, then its resistance ______.

A.ย  becomes four times

B.ย  remains unchanged

C.ย  becomes sixteen times

D.ย  none of these

Solution:

121.ย  Aย  lengthย  ofย  wireย  hasย  aย  resistanceย  ofย  6ย  ohms.ย  The resistanceย  ofย  aย  wireย  ofย  theย  sameย  materialย  three times as long and twice the cross-sectional area will be ____.

A.ย  36 ohms

B.ย  12 ohms

C.ย  9 ohms

D.ย  1 ohm

Solution:

122.ย  The SI unit of specific resistance is ______.

A.ย  mho

B.ย  ohm-m

C.ย  ohm-m2

D.ย  ohm-cm

Solution:

123.ย  Theย  specificย  resistanceย  ofย  aย  conductorย  ______ย  with rise in temperature.

A.ย  increases

B.ย  decreases

C.ย  remains unchanged

D.ย  none of these

Solution:

124.ย  The SI unit of conductivity is ______.

A.ย  ohm-m

B.ย  ohm/m

C.ย ย  mho-m

D.ย  mho/m

Solution:

125.ย  The SI unit of conductance is ______.

A.ย  mho

B.ย  ohm

C.ย  ohm-m

D.ย  ohm-cm

Solution:

126.ย  The resistance of a material 2 m long and 2 m2 in cross-sectionalย  areaย  isย  1.6ย  xย  10-8 ฮฉ.ย  Itsย  specific resistance will be ______.

A.ย  3.2 x 10-8 ohm-m

B.ย  6.4 x 10-8 ohm-m

C.ย  1.6 x 10-8 ohm-m

D.ย  0.16 x 10-8 ohm-m

Solution:

127.ย  Conductorsย  haveย  ______ย  temperatureย  coefficientย  of resistance.

A.ย  positive

B.ย  negative

C.ย  zero

D.ย  none of these

Solution:

128.ย  Semiconductors have ______ temperature coefficient of resistance.

A.ย  negative

B.ย  positive

C.ย  zero

D.ย  none of these

Solution:

129.ย  Theย  valueย  ofย  ฮฑย  (i.e.ย  temperatureย  coefficientย  of resistance) depends upon

A.ย  length of the material

B.ย  cross-sectional area of the material

C.ย  volume of the material

D.ย  nature of the material and temperature

Solution:

130.ย  Theย  temperatureย  coefficientย  ofย  resistanceย  ofย  a conductor ______ with rise in temperature.

A.ย  increases

B.ย  decreases

C.ย  remains unchanged

D.ย  none of these

Solution:

131.ย  Insulatorsย  haveย  ______ย  temperatureย  coefficientย  of resistance.

A.ย  zero

B.ย  positive

C.ย  negative

D.ย  none of these

Solution:

132.ย  Eurekaย  hasย  ______ย  temperatureย  coefficientย  of resistance.

A.ย  positive

B.ย  negative

C.ย  almost zero

D.ย  none of these

Solution:

133.ย  Fig. 1.1 shows the temperature/resistance graph of a conductor. The value of ฮฑ0 is ______.

A.ย  0.005/ยฐC

B.ย  0.004/ยฐC

C.ย  0.1/ยฐC

D.ย  0.4/ยฐC

Solution:

134.ย  Referringย  toย  Fig.ย  1.1,ย  theย  valueย  ofย  theย  ฮฑ50ย  willย  be ______.

A.ย  0.005/ยฐC

B.ย  0.004/ยฐC

C.ย  0.1/ยฐC

D.ย  0.4/ยฐC

Solution:

135.ย  Referring to Fig. 1.2, the value of ฮฑ0 is ______.

A.ย  1/30 per ยฐC

B.ย  1/40 per ยฐC

C.ย  1/1200 per ยฐC

D.ย  none of these

Solution:

136.ย  Referring to Fig. 1.2, the value of R40 will be _____.

A.ย  70 ohms

B.ย  40 ohms

C.ย  35 ohms

D.ย  50 ohms

Solution:

137.ย  Referring to Fig. 1.2, the value of ฮฑ40 will be _____.

A.ย  1/30 per ยฐC

B.ย  1/70 per ยฐC

C.ย  1/50 per ยฐC

D.ย  1/1200 per ยฐC

Solution:

138.ย  The value of ฮฑ0ย  of a conductor is 1/236 per ยฐC. The value of ฮฑ18 will be _____.

A.ย  1/218 per ยฐC

B.ย  1/272 per ยฐC

C.ย  1/254 per ยฐC

D.ย  none of these

Solution:

139.ย  The value of ฮฑ50 of a conductor is 1/230 per ยฐC. The value of ฮฑ0 will be ____.

A.ย  1/180 per ยฐC

B.ย  1/280 per ยฐC

C.ย  1/250 per ยฐC

D.ย  none of these

Solution:

140.ย  A good electric conductor is one that

A.ย  has low conductance

B.ย  is always made of copper wire

C.ย  produces a minimum voltage drop

D.ย  has few free electrons

Solution:

141.ย  Twoย  wiresย  Aย  andย  Bย  haveย  theย  sameย  cross-section and are made of the same material, RA = 600 ฮฉ and RB = 100 ฮฉ. The number of times A is longer than B is

A.ย  6

B.ย  2

C.ย  4

D.ย  5

Solution:

142.ย  A coil has a resistance of 100 ฮฉย  at 90ยฐC. At 100ยฐC, its resistance is 101ย  ฮฉ. The temperature coefficient of wire at 90ยฐC is

A.ย  0.01

B.ย  0.1

C.ย  0.0001

D.ย  0.001

Solution:

143.ย  Whichย  ofย  theย  followingย  materialย  hasย  nearlyย  zero temperature-coefficient of resistance?

A.ย  carbon

B.ย  porcelain

C.ย  copper

D.ย  manganin

Solution:

144.ย  Whichย  ofย  theย  followingย  materialย  hasย  aย  negative temperature coefficient of resistance?

A.ย  brass

B.ย  copper

C.ย  aluminum

D.ย  carbon

Solution:

145.ย  A cylindrical wire 1 m in length, has a resistance of 100ย  ฮฉ.ย  Whatย  wouldย  beย  theย  resistanceย  ofย  aย  wire madeย  fromย  theย  sameย  materialย  bothย  theย  lengthย  and the cross-sectional area are doubled?

A.ย  200

B.ย  400

C.ย  100

D.ย  50

Solution:

146.ย  Carbonย  compositionย  resistorsย  areย  mostย  popular because they

A.ย  cost the least

B.ย  are smaller

D.ย  do not produce electric noise

Solution:

147.ย  A unique feature of a wire-wound resistor is its

A.ย  lower power rating

B.ย  low cost

C.ย  high stability

D.ย  small size

Solution:

148.ย  Aย  coilย  hasย  aย  resistanceย  ofย  100ย  ohmsย  atย  90ยฐC.ย  At 100ยฐC,ย  itsย  resistanceย  isย  101ย  ohms.ย  Whatย  isย  the temperature coefficient of the wire at 90ยฐC?

A.ย  0.01

B.ย  0.1

C.ย  0.0001

D.ย  0.001

Solution:

149.ย  What is the unit for charge (Q)?

B.ย  Joule

C.ย  Siemens

D.ย  Coulomb

Solution:

150.ย  The charge delivered by a constant voltage source isย  shown.ย  Determineย  theย  currentย  suppliedย  byย  the source at (a) t = 1 s (b) t = 3 s.

A.ย  5 ma, -3.33 ma

B.ย  5 ma, 3.33 ma

C.ย  โ3.33 ma, 5 ma

D.ย  3.33 ma, 5 ma

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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