1. Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law?
a) Capacitors
b) Inductors
c) Transistors
d) Resistance
Answer: c
2. What is constant for a charged spherical shell according to basic electrical energy?
a) Electrical potential outside the spherical shell
b) Electrical potential inside the spherical shell
c) Electrical field outside the spherical shell
d) Electrical field inside the spherical shell
View Answer
Answer: b
Explanation: According to principles of electrical energy, the electrical potential inside the spherical shell is constant and is represented as V = kq/R where k = 1/4πεo. This potential is the same as that of the potential on the surface of the sphere.
3. Where does electro-static shielding occur in a charged spherical shell?
a) When electrical potential outside spherical shell is zero
b) When electrical potential inside the spherical shell is zero
c) When electrical field outside the spherical shell
d) Electrical field inside the spherical shell
View Answer
Answer: d
Explanation: The electrical field inside the spherical shell is zero and this is basically known as electrostatic shielding. The electric field outside the sphere is inversely proportional to the square of the radius.
4. Which of the following is a correct representation of peak value in an AC Circuit?
a) RMS value/Peak factor
b) RMS value*Form factor
c) RMS value/Form factor
d) RMS value*Peak factor
View Answer
Answer: d
Explanation: A peak factor in an AC circuit represents the ratio of the peak value to the RMS value. The peak factor also called the crest factor indicates how extreme the peaks are present in a waveform.
5. Which of the following according to fundaments of electrical energy is correct about alternating current?
a) Frequency is zero
b) Magnitude changes with time
c) Can be transported to larger distances with less loss in power
d) Flows in both directions
View Answer
Answer: a
Explanation: An alternating current changes its value with time and flows in both directions. The loss in power is less due to alternating current properties and thus, can be transported to larger distances.