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
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⇐ MCQ in DC Circuits Part 2 | REE Board Exam
101. A certain wire 20 ft long and 100 circular mil area has a resistance of 1.6 Ω. What is its resistivity?
A. 10.3 ohm-CM/ft
B. 2.2 ohm-CM/ft
C. 8 ohm-CM/ft
D. 15.2 ohm-CM/ft
Answer: Option C
Solution:
102. How many circular mils does a round copper rod of 0.25 inch diameter have?
A. 196,000
B. 62,500
C. 1,963,500
D. 49,000
Answer: Option B
Solution:
103. A substance whose molecules consist of the same kind of atoms is called ______.
A. mixture
B. element
C. compound
D. none of these
Answer: Option B
Solution:
104. The diameter of the atom is about ______.
A. 10-10 m
B. 10-8 m
C. 10-2 m
D. 10-15 m
Answer: Option A
Solution:
105. The number of compounds available in nature is ______.
A. 105
B. 300
C. 1000
D. unlimited
Answer: Option D
Solution:
106. The mass of a proton is ____ the mass of an electron.
A. equal to
B. less than
C. about 1837 times
D. 200 times
Answer: Option C
Solution:
107. The maximum number of electrons that can be accommodated in the last orbit is ____.
A. 4
B. 8
C. 18
D. 2
Answer: Option B
Solution:
108. The electrons in the last orbit of an atom are called _____ electrons.
A. free
B. bound
C. valence
D. thermionic
Answer: Option C
Solution:
109. If the number of valence electrons of an atom is less than 4, the substance is usually ____.
A. a conductor
B. an insulator
C. a semiconductor
D. none of these
Answer: Option A
Solution:
110. If the number of valence electrons of an atom is more than 4, the substance is usually ____.
A. a semiconductor
B. a conductor
C. an insulator
D. none of these
Answer: Option C
Solution:
111. If the number of valence electrons of an atom is exactly 4, the substance is usually ____.
A. a semiconductor
B. an insulator
C. a conductor
D. a semiconductor
Answer: Option A
Solution:
112. The number of valence electrons of an atom is less than 4. The substance will be probably ____.
A. a metal
B. a non-metal
C. an insulator
D. a semiconductor
Answer: Option A
Solution:
113. One coulomb of charge is equal to the charge on ____ electrons.
A. 628 x 1016
C. 62.8 x 1016
B. 6.28 x 1016
D. 0.628 x 1016
Answer: Option A
Solution:
114. One cc of copper has about _____ free electrons at room temperature.
A. 200
B. 20 x 1010
C. 8.5 x 1022
D. 3 x 105
Answer: Option C
Solution:
115. Electric current in a wire is the flow of ______.
A. free electrons
B. bound electrons
C. valence electrons
D. atoms
Answer: Option A
Solution:
116. EMF in a circuit is ______.
A. cause current to flow
B. maintains potential difference
C. increases the circuit resistance
D. none of these
Answer: Option B
Solution:
117. EMF has the unit of _____.
A. power
B. energy
C. charge
D. none of these
Answer: Option B
Solution:
118. Potential difference has the unit of _____.
A. charge
B. power
C. energy
D. none of these
Answer: Option C
Solution:
119. The resistance of a material is ____ its area of cross-section.
A. directly proportional to
B. inversely proportional to
C. independent of
D. none of these
Answer: Option B
Solution:
120. If the length and area of cross-section of a wire are doubled up, then its resistance ______.
A. becomes four times
B. remains unchanged
C. becomes sixteen times
D. none of these
Answer: Option B
Solution:
121. A length of wire has a resistance of 6 ohms. The resistance of a wire of the same material three times as long and twice the cross-sectional area will be ____.
A. 36 ohms
B. 12 ohms
C. 9 ohms
D. 1 ohm
Answer: Option C
Solution:
122. The SI unit of specific resistance is ______.
A. mho
B. ohm-m
C. ohm-m2
D. ohm-cm
Answer: Option B
Solution:
123. The specific resistance of a conductor ______ with rise in temperature.
A. increases
B. decreases
C. remains unchanged
D. none of these
Answer: Option A
Solution:
124. The SI unit of conductivity is ______.
A. ohm-m
B. ohm/m
C. mho-m
D. mho/m
Answer: Option D
Solution:
125. The SI unit of conductance is ______.
A. mho
B. ohm
C. ohm-m
D. ohm-cm
Answer: Option A
Solution:
126. The resistance of a material 2 m long and 2 m2 in cross-sectional area is 1.6 x 10-8 Ω. Its specific resistance will be ______.
A. 3.2 x 10-8 ohm-m
B. 6.4 x 10-8 ohm-m
C. 1.6 x 10-8 ohm-m
D. 0.16 x 10-8 ohm-m
Answer: Option C
Solution:
127. Conductors have ______ temperature coefficient of resistance.
A. positive
B. negative
C. zero
D. none of these
Answer: Option A
Solution:
128. Semiconductors have ______ temperature coefficient of resistance.
A. negative
B. positive
C. zero
D. none of these
Answer: Option A
Solution:
129. The value of α (i.e. temperature coefficient of resistance) depends upon
A. length of the material
B. cross-sectional area of the material
C. volume of the material
D. nature of the material and temperature
Answer: Option D
Solution:
130. The temperature coefficient of resistance of a conductor ______ with rise in temperature.
A. increases
B. decreases
C. remains unchanged
D. none of these
Answer: Option B
Solution:
131. Insulators have ______ temperature coefficient of resistance.
A. zero
B. positive
C. negative
D. none of these
Answer: Option C
Solution:
132. Eureka has ______ temperature coefficient of resistance.
A. positive
B. negative
C. almost zero
D. none of these
Answer: Option C
Solution:
133. Fig. 1.1 shows the temperature/resistance graph of a conductor. The value of α0 is ______.
A. 0.005/°C
B. 0.004/°C
C. 0.1/°C
D. 0.4/°C
Answer: Option A
Solution:
134. Referring to Fig. 1.1, the value of the α50 will be ______.
A. 0.005/°C
B. 0.004/°C
C. 0.1/°C
D. 0.4/°C
Answer: Option B
Solution:
135. Referring to Fig. 1.2, the value of α0 is ______.
A. 1/30 per °C
B. 1/40 per °C
C. 1/1200 per °C
D. none of these
Answer: Option A
Solution:
136. Referring to Fig. 1.2, the value of R40 will be _____.
A. 70 ohms
B. 40 ohms
C. 35 ohms
D. 50 ohms
Answer: Option A
Solution:
137. Referring to Fig. 1.2, the value of α40 will be _____.
A. 1/30 per °C
B. 1/70 per °C
C. 1/50 per °C
D. 1/1200 per °C
Answer: Option B
Solution:
138. The value of α0 of a conductor is 1/236 per °C. The value of α18 will be _____.
A. 1/218 per °C
B. 1/272 per °C
C. 1/254 per °C
D. none of these
Answer: Option C
Solution:
139. The value of α50 of a conductor is 1/230 per °C. The value of α0 will be ____.
A. 1/180 per °C
B. 1/280 per °C
C. 1/250 per °C
D. none of these
Answer: Option A
Solution:
140. A good electric conductor is one that
A. has low conductance
B. is always made of copper wire
C. produces a minimum voltage drop
D. has few free electrons
Answer: Option C
Solution:
141. Two wires A and B have the same cross-section and are made of the same material, RA = 600 Ω and RB = 100 Ω. The number of times A is longer than B is
A. 6
B. 2
C. 4
D. 5
Answer: Option A
Solution:
142. A coil has a resistance of 100 Ω at 90°C. At 100°C, its resistance is 101 Ω. The temperature coefficient of wire at 90°C is
A. 0.01
B. 0.1
C. 0.0001
D. 0.001
Answer: Option D
Solution:
143. Which of the following material has nearly zero temperature-coefficient of resistance?
A. carbon
B. porcelain
C. copper
D. manganin
Answer: Option D
Solution:
144. Which of the following material has a negative temperature coefficient of resistance?
A. brass
B. copper
C. aluminum
D. carbon
Answer: Option D
Solution:
145. A cylindrical wire 1 m in length, has a resistance of 100 Ω. What would be the resistance of a wire made from the same material both the length and the cross-sectional area are doubled?
A. 200
B. 400
C. 100
D. 50
Answer: Option C
Solution:
146. Carbon composition resistors are most popular because they
A. cost the least
B. are smaller
C. can withstand overload
D. do not produce electric noise
Answer: Option A
Solution:
147. A unique feature of a wire-wound resistor is its
A. lower power rating
B. low cost
C. high stability
D. small size
Answer: Option C
Solution:
148. A coil has a resistance of 100 ohms at 90°C. At 100°C, its resistance is 101 ohms. What is the temperature coefficient of the wire at 90°C?
A. 0.01
B. 0.1
C. 0.0001
D. 0.001
Answer: Option D
Solution:
149. What is the unit for charge (Q)?
A. Farad
B. Joule
C. Siemens
D. Coulomb
Answer: Option D
Solution:
150. The charge delivered by a constant voltage source is shown. Determine the current supplied by the source at (a) t = 1 s (b) t = 3 s.
A. 5 ma, -3.33 ma
B. 5 ma, 3.33 ma
C. –3.33 ma, 5 ma
D. 3.33 ma, 5 ma
Answer: Option A
Solution:
⇒ MCQ in DC Circuits Part 4 | REE Board Exam
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