Electrical Engineering · Question Bank

Fundamentals of Electricity

141 questions · page 3 of 8. Answer in your head first, then check the solution.

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#41📜 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

#42📜 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

#43📜 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

#44📜 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

#45📜 EE Pre-Board March 2016📘 PowerhouseEasy

Find the amount of electrical energy expended in raising the temperature of 45 liters of water by 75°C. Assume a heater efficiency of 90%.

A2.64 KWHR

B3.46 KWHR

C4.36 KWHR

D6.34 KWHR

#46📜 EE Pre-Board March 2017📘 PowerhouseEasy

One KWHR is equal to __________ BTU.

A360

B3,413

C3,600

D1,000

#47📜 EE Pre-Board March 2017📘 PowerhouseEasy

Heating effect of current has an undesirable side effect in

AElectric oven

Bimmersion heater

Celectric iron

Dvacuum cleaner

#48📜 EE Pre-Board March 2017📘 PowerhouseEasy

A Walkman has 4 – AA batteries. The combination has a capacity of 200 watt-sec. How long will it take to discharge if Walkman consumes 10 mA at 6 v?

A55.6 min

B65.6 min

C45.6 min

D75.6 min

#49📜 EE Pre-Board March 2017📘 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 at 20°C

#50📜 EE Pre-Board March 2017📘 PowerhouseEasy

Which is not a source of power?

AThermocouple

BFuel cell

CPhotovoltaic cell

DSolar cell

#51📜 EE Pre-Board March 2017📘 PowerhouseEasy

A copper wire is drawn down such that its length is doubled but the volume remains the same, what is the new resistance of the wire?

A\(R_{1}\)

B\(R_{1}\) /2

C2\(R_{1}\)

D4\(R_{1}\)

#52📜 EE Pre-Board March 2017📘 PowerhouseEasy

A certain amount of fuel contains \(15 \times 10^{10}\) BTU of energy. What is the corresponding energy in kilocalories?

A\(3.78 \times 10^{13}\) kcal

B\(3.78 \times 10^{12}\) kcal

C\(3.78 \times 10^{11}\) kcal

D\(3.78 \times 10^{10}\) kcal

#53📜 EE Pre-Board March 2017📘 PowerhouseEasy

The velocity of electromagnetic waves in free space is given by

A\(\sqrt{\mu_0/\varepsilon_0}\)

B\(\sqrt{\mu_0\varepsilon_0}\)

C\(1/\sqrt{\mu_0\varepsilon_0}\)

D\(\sqrt{\varepsilon_0/\mu_0}\)

#54📜 EE Pre-Board March 2017📘 PowerhouseEasy

Human body is

AInsulator

Blow resistive

Cconductor

Delectrolyte

#55📜 EE Pre-Board March 2017📘 PowerhouseEasy

The resistance of a winding wire made up to copper is 25 ohms at 30°C. What is its resistance when it operates at a temperature of 75°C? Assume temperature coefficient at 20°C equals 0.004/°C.

A31.36 Ω

B24.04 Ω

C27.45 Ω

D29.33 Ω

#56📜 EE Pre-Board March 2017📘 PowerhouseEasy

A 40 m metallic conductor of cross-sectional area 1 mm² has a resistance of 12 Ω. Calculate the conductivity of the metal.

A3.33 kS/m

B33.3 MS/m

C33.3 kS/m

D3.33 MS/m

#57📜 EE Pre-Board March 2017📘 PowerhouseEasy

A car battery supplies 48 J of energy at 12 v over a certain period of time. Determine the charge moved during this period.

A0.33 C

B0.25 C

C4 C

D2 C

#58📜 EE Pre-Board August 2017📘 PowerhouseEasy

The current-carrying capacity of a copper wire having twice the diameter of another copper wire is ______________ as great.

Atwice

Bfour times

Chalf

Deight times

#59📜 EE Pre-Board August 2017📘 PowerhouseEasy

\(10^{13}\) ergs/sec is equal to how many kW?

A1,000 kW

B100 kW

C10,000 kW

D10 kW

#60📜 EE Pre-Board August 2017📘 PowerhouseEasy

A coil of copper wire has a resistance of 5.46 Ω at 75°C. What will be its resistance at 25°C?

A6.51 Ω

B4.85 Ω

C4.12 Ω

D4.58 Ω

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