Electronic Principles — Part 1 MCQs with Explanations

The correct answer is C: 2 Here's why: In a semiconductor, there are two main types of charge carriers that contribute to current flow: 1. Electrons: These are negatively charged particles. 2. Holes: These are the absence of electrons, effectively acting as positive charge carriers. Think of them as bubbles in a liquid; when a bubble moves, it's the liquid moving around it that creates the bubble's apparent movement. Therefore, there are two types of flow (electron flow and hole flow) in a semiconductor.

Equals the number of holes is the correct answer to “In an intrinsic semiconductor, the number of free electrons”. This question is standard in competitive examination syllabi for Electronic Principles.

generator is the correct answer to “A device that converts mechanical into electrical energy is”. This question is standard in competitive examination syllabi for Electronic Principles.

A diamagnetic material is the correct answer to “Which one of the following kinds of materials has the lowest permeability”. This question is standard in competitive examination syllabi for Electronic Principles.

is maximum at the resonant frequency is the correct answer to “The total impedance of a parallel RLC circuit:”. This question is standard in competitive examination syllabi for Electronic Principles.

from 10% of the peak value to 90% of the peak value is the correct answer to “The rise time of a pulse waveform is the time required for the voltage to rise:”. This question is standard in competitive examination syllabi for Electronic Principles.

ac current leads the voltage by 90 degree is the correct answer to “For a pure capacitor:”. This question is standard in competitive examination syllabi for Electronic Principles.

commutator is the correct answer to “The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:”. This question is standard in competitive examination syllabi for Electronic Principles.

ac current lags the voltage by 90 degree is the correct answer to “In a pure inductor:”. This question is standard in competitive examination syllabi for Electronic Principles.

amplitude on the vertical axis and the passage of time on the horizontal axis is the correct answer to “Waveforms are graphs that show:”. This question is standard in competitive examination syllabi for Electronic Principles.

increases is the correct answer to “When the collector current increases, what does the current gain do”. This question is standard in competitive examination syllabi for Electronic Principles.

Ohmmeter is the correct answer to “Which one of the following devices is most often used for measuring opposition to current flow in a circuit”. This question is standard in competitive examination syllabi for Electronic Principles.

Chemical energy is the correct answer to “What form of energy is used to maintain an imbalance of charges between the terminals of a battery”. This question is standard in competitive examination syllabi for Electronic Principles.

The voltage waveform for each component always has the same amplitude and phase as the applied voltage is the correct answer to “Which one of the following statements best applies to a parallel RLC circuit”. This question is standard in competitive examination syllabi for Electronic Principles.

one-millionth of an ampere is the correct answer to “The equivalent of 1 micro A is:”. This question is standard in competitive examination syllabi for Electronic Principles.

Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently is the correct answer to “Which one of the following statements best describes magnetic hysteresis”. This question is standard in competitive examination syllabi for Electronic Principles.

Magnetism that remains in the core of an electromagnet after the current through the coil is turned off is the correct answer to “Which one of the following phrases best describes residual magnetism”. This question is standard in competitive examination syllabi for Electronic Principles.

208 mA is the correct answer to “A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current”. This question is standard in competitive examination syllabi for Electronic Principles.

I = P/E is the correct answer to “Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs”. This question is standard in competitive examination syllabi for Electronic Principles.

Inductive reactance provides the only opposition to current flow is the correct answer to “Which one of the following phrases most accurately describes a purely inductive circuit”. This question is standard in competitive examination syllabi for Electronic Principles.

Barrier potential is the correct answer to “The knee voltage of a diode is approximately equal to the”. This question is standard in competitive examination syllabi for Electronic Principles.

410 Ohm is the correct answer to “A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have”. This question is standard in competitive examination syllabi for Electronic Principles.

equal to 0.707 times the peak amplitude is the correct answer to “The rms value of a sine waveform is:”. This question is standard in competitive examination syllabi for Electronic Principles.

The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it is the correct answer to “Which one of the following is a direct statement of Ohm's law”. This question is standard in competitive examination syllabi for Electronic Principles.

passes higher-frequency signals and reduces lower-frequency signals is the correct answer to “A high-pass filter:”. This question is standard in competitive examination syllabi for Electronic Principles.

The total voltage is less than the sum of the voltages across the resistance and capacitance is the correct answer to “Which one of the following statements is true for the voltages in a series RC circuit”. This question is standard in competitive examination syllabi for Electronic Principles.

chemical cells is the correct answer to “A battery is a device composed of one or more:”. This question is standard in competitive examination syllabi for Electronic Principles.

has no effect on the capacitive reactance is the correct answer to “Doubling the operating voltage of a purely capacitive circuit:”. This question is standard in competitive examination syllabi for Electronic Principles.

0.955 A is the correct answer to “How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source”. This question is standard in competitive examination syllabi for Electronic Principles.

250 µA is the correct answer to “The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor”. This question is standard in competitive examination syllabi for Electronic Principles.

45 degree is the correct answer to “What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm”. This question is standard in competitive examination syllabi for Electronic Principles.

The smallest particle of a substance that retains the properties of that substance is the correct answer to “Molecule is”. This question is standard in competitive examination syllabi for Electronic Principles.

Light energy is the correct answer to “What form of energy is used for creating static electricity”. This question is standard in competitive examination syllabi for Electronic Principles.

0.17 V is the correct answer to “Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA”. This question is standard in competitive examination syllabi for Electronic Principles.

3.75 mA is the correct answer to “A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current”. This question is standard in competitive examination syllabi for Electronic Principles.

a good insulator is the correct answer to “A dielectric material is:”. This question is standard in competitive examination syllabi for Electronic Principles.

1000 A is the correct answer to “A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns”. This question is standard in competitive examination syllabi for Electronic Principles.

More than 100 k Ohm is the correct answer to “If a load resistance is 1 kW, a stiff current source has a resistance of”. This question is standard in competitive examination syllabi for Electronic Principles.

100 Ohm or more is the correct answer to “A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff”. This question is standard in competitive examination syllabi for Electronic Principles.

Increases is the correct answer to “The number of free electrons and holes in intrinsic semiconductor increases when the temperature”. This question is standard in competitive examination syllabi for Electronic Principles.