Electrical Engineering · Question Bank

Fundamentals of Electricity

136 of 141 questions match · page 2 of 7. Answer in your head first, then check the solution.

Study the lessons
TypeAll 136Problem solving 42Objective 94
DifficultyAll 141Easy 136Medium 5Hard
✕ Clear filters
#21📜 EE Pre-Board March 2015📘 PowerhouseEasy
The resistance of a copper wire at 30°C is 50 Ω. If the temperature coefficient of copper at 0°C is 0.00427, what is the resistance at 100°C?
A72.26 Ω
B63.24 Ω
C54.25 Ω
D58.15 Ω
#22📜 EE Pre-Board March 2015📘 PowerhouseEasy
A constant current of 2 A flows through a circuit element. In 10 seconds, how much net charge passes through the element?
A0.2 C
B2 C
C20 C
D200 C
#23📜 EE Pre-Board March 2015📘 PowerhouseEasy
Compute the resistance of a copper wire having a diameter of 2.05 mm and a length of 10 m.
A52 Ω
B5.2 Ω
C0.52 Ω
D0.052 Ω
#24📜 EE Pre-Board March 2015📘 PowerhouseEasy
What is \(10^{13}\) ergs/sec in kW?
A1,000 KW
B2,000 KW
C1,800 KW
D3,000 KW
#25📜 EE Pre-Board August 2015📘 PowerhouseEasy
One kwhr is equal to_____ BTU.
A960
B3,413
C3600
D1000
#26📜 EE Pre-Board August 2015📘 PowerhouseEasy
When the length of a wire is doubled and all other factors remained the same, what would the wire resistance become?
ARemained the same
BDoubled
Cdecreased
Dcould not be determined
#27📜 EE Pre-Board August 2015📘 PowerhouseEasy
An aluminum wire has a diameter of 2 mm. What must be the diameter of copper wire of the same resistance and length as aluminum?
A1.33 mm
B1.45 mm
C1.56 mm
D1.75 mm
#28📜 EE Pre-Board August 2015📘 PowerhouseEasy
A 220-V bulb draws a current of 10 A. How much charge in kilocoulombs will pass through the bulb in a two-hour period?
A7.2
B3.6
C36
D72
#29📜 EE Pre-Board August 2015📘 PowerhouseEasy
\(7.1 \times 10^{10}\) BTU is equal to______ Gcal.
A17.829
B178.92
C1,789.2
D17,892
#30📜 EE Pre-Board August 2015📘 PowerhouseEasy
The resistance of a coil of wire increases from 40 Ω at 10°C to 48.25 Ω at 60°C. Find the temperature coefficient at 0°C of the conductor material.
A0.0043 /°C
B0.0039 /°C
C0.0027 /°C
D0.0013 /°C
#31📜 EE Pre-Board August 2015📘 PowerhouseEasy
A substance that contains atoms with several bands of electrons but with only one valence electron is
AInsulator
BConductor
CSemiconductor
DResistor
#32📜 EE Pre-Board August 2015📘 PowerhouseEasy
What is the resistance of 2,000 m of copper wire that has a resistivity of \(1.72 \times 10^{-8}\) Ω·m and a diameter of 4 mm?
A0.086 Ω
B2.74 Ω
C1.37 Ω
D3.24 Ω
#33📜 EE Pre-Board August 2015📘 PowerhouseEasy
A coulomb
ARepresent a current of 1 ampere
BFlows through a 100-watt light bulb
CIs equivalent to 1 ampere per second
Dis an extremely large number of charge carriers
#34📜 EE Pre-Board August 2015📘 PowerhouseEasy
The power required to produce a gain of 10dB over 4 w of original power is
A80 W
B40 W
C0.4 W
D8 W
#35📜 EE Pre-Board August 2015📘 PowerhouseEasy
An ion
AIs electrically neutral
BHas positive electric charge
Chas negative electric charge
Dcan have either a positive or negative charge
#36📜 EE Pre-Board March 2016📘 PowerhouseEasy
Wavelength is the distance travelled by an electromagnetic wave during the time of one cycle. Given a wavelength of 12 meters, what is the frequency?
A250 KHZ
B25KHz
C250MHZ
D25MHZ
#37📜 EE Pre-Board March 2016📘 PowerhouseEasy
Joule found out that the heat produced in a current carrying conductor is proportional to
AThe square of the current
BThe current
Cthe square of resistance
Dinversely proportional to time
#38📜 EE Pre-Board March 2016📘 PowerhouseEasy
The resistances of the same length of aluminum and copper wires are found to be equal. Find the ratio of radii of aluminum to copper.
A0.78
B1.29
C0.88
D1.14
#39📜 EE Pre-Board March 2016📘 PowerhouseEasy
The specific resistance ρ is defined as
AResistance of a conductor which has a length of 1 m and a cross section of 1 m² at 20°C
BResistance of any conductor at 25°C
CResistance of any conductor at 20°C
DResistance of a conductor which has a length of 1 m and a cross section of 1 cm²
#40📜 EE Pre-Board March 2016📘 PowerhouseEasy
The current-carrying capacity of a copper wire having twice the diameter of another copper wire is ______________ as great.
ATwice
BHalf
C4 Times
D3 Times

More Electrical Engineering topics