Electrical Engineering · Question Bank

Fundamentals of Electricity

47 of 141 questions match · page 1 of 3. Answer in your head first, then check the solution.

#1📜 EE Pre-Board August 2012📘 PowerhouseEasy

An electric motor converted 700 W of electrical input into work at 58.186 kg-m/s. The speed was 1750 rpm. Find the kg-m of driven torque.

A0.183

B0.381

C0.138

D0.318

#2📜 EE Pre-Board March 2013📘 PowerhouseMedium

A total of 0.8 kg of water at 20 °C is placed in a 1-kW electric kettle. How long a time in minutes is needed to raise the temperature of the water to 100 °C?

A4.46 min

B4.56 min

C5.32 min

D6.34 min

#3📜 EE Pre-Board August 2013📘 PowerhouseEasy

A conductor radius of 0.1625 inch. What is the area in circular mils?

A26,406.25

B82,957.68

C100,000

D105,625

#4📜 EE Pre-Board August 2013📘 PowerhouseEasy

A heater wire of length 50 cm and 1 mm² in cross-section carries a current of 2 A when connected across a 2 V battery. What is the resistivity of the wire?

A\(2 \times 10^{-6}\) Ω-m

B\(2 \times 10^{-5}\) Ω-m

C\(4 \times 10^{-6}\) Ω-m

D\(4 \times 10^{-5}\) Ω-m

#5📜 EE Pre-Board August 2013📘 PowerhouseEasy

A rectangular bus bar is made of aluminum and is 90 cm long, 10 cm wide and 1 cm thick. If the bus bar current flows along its length, find the bus bar conductance provided the conductivity is \(3.6 \times 10^{8}\) S/m.

A\(0.4 \times 10^{6}\) S

B\(0.4 \times 10^{5}\) S

C\(0.5 \times 10^{6}\) S

D\(0.5 \times 10^{5}\) S

#6📜 EE Pre-Board August 2013📘 PowerhouseEasy

An energy source supplies 500 J of energy at 100 v for a certain period of time. Determine the quantity of charge passed through.

A0.2 c

B50 kc

C20 c

D5 c

#7📜 EE Pre-Board August 2013📘 PowerhouseEasy

A 500 MCM ACSR cable has 37 strands. Determine the diameter in mils of each strand.

A116.25

B118.34

C110.35

D120.24

#8📜 EE Pre-Board March 2014📘 PowerhouseEasy

There are two wired A and B. If the resistance of B is R and the diameter of A is twice of B, the length and the nature of the material is the same, find resistance of A.

AR/2

BR/4

C4R

D2R

#9📜 EE Pre-Board March 2014📘 PowerhouseEasy

The breakdown voltage of the dielectric of a cable is 800 volts/mil. A factor of safety of 4 is used. Find the maximum voltage at 3.5 mils.

A2,800 v

B700 v

C3,600 v

D900v

#10📜 EE Pre-Board March 2014📘 PowerhouseEasy

A wire has a resistance of 1 Ω. If the length is increased four times and the area is doubled, find the new resistance of the wire.

A5 Ω

B2 Ω

C1 Ω

D0.5

#11📜 EE Pre-Board March 2014📘 PowerhouseMedium

An aluminum cable has 10 identical strands, a length of 1,500 m and a diameter of 2.50 mm each. What is the resistance of the cable?

A5.63 Ω

B0.563 Ω

C8.63 Ω

D0.863 Ω

#12📜 EE Pre-Board March 2014📘 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 MS/m

B0.333 MS/m

C6.67 MS/m

D0.667 MS/m

#13📜 EE Pre-Board March 2014📘 PowerhouseMedium

A light bulb having a tungsten filament draws 0.5 A at 110 V. The cold resistance of the filament is 20 Ω at 20 °C. At this temperature the temperature coefficient of resistance for tungsten is 0.005 per °C. Determine the operating temperature of the bulb.

A1,980 °C

B2,080 °C

C2,120 °C

D2,020 °C

#14📜 EE Pre-Board March 2014📘 PowerhouseEasy

A span of wire 1 km long has a conductance of 0.6 s. What is the conductance of a span of this same wire that is 3 km long?

A1.8 s

B0.6 s

C0.2 s

D0.36 s

#15📜 EE Pre-Board August 2014📘 PowerhouseMedium

An electric heater develops a power of 1 kW when run on a 230 V supply. If the heater resistance wire has a diameter of 0.5 mm and a resistivity of \(60 \times 10^{-8}\) Ω-m, find the minimum length of the wire required.

A11.33 m

B13.3 m

C15.3 m

D17.3 m

#16📜 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

#17📜 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

#18📜 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

#19📜 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

#20📜 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

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