Important questions about Electronic Principles. Electronic Principles MCQ questions with answers. Electronic Principles exam questions and answers for students and interviews.

1. What is the smallest number of polarities required for current flow?

Options

A : One - a negative terminal

B : Two - a negative terminal and a positive terminal

C : Three - negative, positive and neutral terminals

D : Four - two negative and two positive

2. The value of a capacitor can be made larger by:

Options

A : increasing the area of the plates

B : decreasing the area of the plates

C : increasing the frequency of the applied voltage

D : increasing the voltage applied to the plates

3. Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance?

Options

A : P = I 2 R

B : P = IE

C : P = E 2 /R

D : I = P/E

4. Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?

Options

A : 5 Ohm

B : 50 Ohm or more

C : 100 Ohm

D : 6 Ohm

5. Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it?

Options

A : E = PR

B : E = I 2 R

C : I = E/R

D : I = ER

6. Voltage is

Options

A : The flow of charged particles through a material

B : The smallest electrically charged particle

C : Trie force that causes electrons to flow

D : The number of free electrons in an atom

7. The north pole of a magnet is the one:

Options

A : that has its molecules arranged in a random pattern

B : that would be attracted to the earth's north magnetic pole

C : that would be repelled by the south pole of another magnet

D : that would be attracted to the earth's south magnetic pole

8. A resistor has a rated value of 100 ohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?

Options

A : 90 Ohm - 101 ohm

B : 90 Ohm - 110 ohm

C : 98 Ohm - 100.1 ohm

D : 99 Ohm - 102 ohm

9. What is the turns ratio for the transformer specified in the above question?

Options

A : 10.738

B : 0.707

C : 1.5

D : 0.575

10. What is a negative ion?

Options

A : An atom that contains more electrons than neutrons

B : An atom that contains more protons than neutrons

C : An atom that contains more electrons than protons

D : An atom that contains more protons than electrons

1. Which is the most widely used semiconductor?

Options

A : Copper

B : Silicon

C : Germanium

D : All of the above

2. Which one of the following statements is true?

Options

A : Power dissipation of a pure inductor decreases with operating frequency

B : Power dissipation of a pure inductor is at a maximum for dc source voltages

C : Power dissipation of a pure inductor increases with operating frequency

D : There is no meaningful relationship between the power dissipation of a pure inductor and its operating frequency

3. How much power is being dissipated by a 1000 W resistance that has 25 V applied to it?

Options

A : 0.24 W

B : 0.625 W

C : 80 W

D : 325 kW

4. Current can flow through a normally open push button switch as long as:

Options

A : you are pressing the button

B : you are not pressing the button

C : its contact remain open

D : its contact remain open

5. The transistor has a current gain of 175. If the base current is 0.1 mA, what is the collector current?

Options

A : 1750 mA

B : 17.5 mA

C : 175 mA

D : 1.75 mA

6. An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

Options

A : Doping

B : Valence electrons

C : Free electrons

D : Thermal energy

7. When operating above its resonant frequency, a parallel RLC circuit has the characteristics of a:

Options

A : parallel RL circuit

B : parallel RC circuit

C : parallel RLC circuit operated above its resonant frequency

D : purely resistive circuit

8. A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

Options

A : 15 V

B : 16 V

C : 7.5 V

D : 8 V

9. An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?

Options

A : 28.4 mA

B : 24.2 mA

C : 34.4 mA

D : 68.4 mA

10. Doubling the operating frequency of a purely capacitive circuit: