1. An electric current is the
- storage of charge
- flow of electrons
- ionization of atom
- opposition to electrons
Answer: 2
2. The dielectric material used in variable capacitor is generally
- air
- mica
- ceramic
- electrolyte
Answer: 1
3. How many electrons will constitute 2 Coulombs of charge?
- 6.24 * 1018 electrons
- 12.48 * 1018 electrons
- 1.602 * 1019 electrons
- 3.204 * 1019 electrons
Answer: 2
Explanation: One Coulomb of charge consists of 1/(1.602*10-19) electron that is 6.24 * 1018 electrons. A coulomb is a unit for the charge. Thus, for 2 Coulombs of charge will have 6.24 * 1018 * 2 = 12.48 * 1018 electrons.
4. What is responsible for the current to flow?
- Protons
- Electrons
- Nucleus
- Protons and Electrons
Answer: 2
Explanation: For the current to flow in a circuit electrons are required. Electrons are negatively charged and when the potential difference is applied these electrons flow to constitute a current. The current direction is opposite to the electron flow.
5. Which of the following type of circuits in electrical engineering cannot be analyzed using Ohm’s law?
- Unilateral
- Bilateral
- Linear
- Conductors
Answer: 1
Explanation: Ohm’s law cannot be used for analyzing unilateral networks as such networks only allow current flow in one direction. A unilateral network can consist diode, transistor, etc.
6. Which of the following is correct about direct current?
- Frequency is zero
- Can be transported to larger distances with less loss in power
- Flows in one direction
- Magnitude is constan
Answer: 1
Explanation: A direct current has a fixed value and does not change with time. The frequency of the direct current is equal to zero as it does not change with time.
7. A capacitor consists of two
- insulation separated by a dielectric
- ceramic plates and one mica disc
- silver-coated insulators
- conductors separated by an insulator
Answer: 4
8. In a cable capacitor, voltage gradient is maximum at the surface of the
- sheath
- earth
- conductor
- insulator
Answer: 3
9. The capacitance of a cable capacitor depends on
- core diameter
- ratio of cylinder radii
- potential difference
- insulation thickness
Answer: 2
10. The time constant of an R-C circuit is defined as the time during which capacitor charging current becomes ——— percent of its —— value.
- 37, initial
- 37, final
- 63, initial
- 63, final
Answer: 1
