Practice Electronic Principles Multiple Choice Questions Quiz-6 - MCQGeeks.com

Q.1

Doubling the diameter of the coil in an inductor:

multiplies the value of inductance by two
reduces the value of inductance by one-half
reduces the value of inductance by one-fourth
multiplies the value of inductance by four
None of the above

Q.2

If the current gain is 200 and the collector current is 100 mA, the base current is

2 mA
0.5 mA
2:00 AM
200 A
None of the above

Q.3

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

One - a negative terminal
Two - a negative terminal and a positive terminal
Three - negative, positive and neutral terminals
Four - two negative and two positive
None of the above

Q.4

A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?

55 A
55.86 A
18.2 mA
16.3 mA
None of the above

Q.5

What is the barrier potential of a silicon diode at room temperature?

0.7V
0.3V
1 V
2 m V per degree Celsius
None of the above

Q.6

The Norton current is sometimes called the

Shorted-load current
Open-load current
Thevenin current
Thevenin voltage
None of the above

Q.7

When a parallel RLC circuit is operating at its resonant frequency:

capacitive reactance is greater than the inductive reactance
inductive reactance is greater than the capacitive reactance
inductive reactance is equal to the capacitive reactance
the difference between inductive and capacitive reactance is equal to the resistance
None of the above

Q.8

For normal operation of the transistor, the collector diode has to be

Forward-biased
Reverse-biased
Nonconducting
Operating in the breakdown region
None of the above

Q.9

Two diodes are in series. The first diode has a voltage of 0.75 V and the second has a voltage of 0.8 V. If the current through the first diode is 500 mA, what is the current through the second diode

11 mA
12 mA
10 mA
14 mA
None of the above

Q.10

The graph of current gain versus collector current indicates that the current gain

varies enormously
is contant
varies slightly
equals the collector current divided by the base current
None of the above

Q.11

At room temperature a conductor has low many holes?

Same number as free electrons
many
Only those produced by thermal energy
less than the free electrons
None of the above

Q.12

A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?

2 k Ohm
10 k Ohm
20 k Ohm
1 k Ohm
None of the above

Q.13

In a step-down transformer, which is larger?

Primary voltage
Secondary voltage
Neither
Impossible to say
None of the above

Q.14

Which one of the following principles best describes the basic operation of an electromagnet?

Current is induced in a conductor that is moving through a magnetic field
Like magnetic poles repel, while unlike poles attract
Current flowing through a conductor generates a magnetic field
Like magnetic poles attract, while unlike poles repel
None of the above

Q.15

The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?

14.8 µA
10.3 µA
7.8 µA
7.75 µA
None of the above

Q.16

Which one of the following statements is true for the currents in a parallel RL circuit?

The total current is equal to the sum of the currents through the resistance and inductance
The current always has the same amplitude and phase for every part of the circuit
The total current is less than the sum of the currents through the resistance and inductance
The total current leads the total voltage by less than 90
None of the above

Q.17

When the Q point moves along the load line, the voltage increases when the current

Decreases
Stays the same
Increases
Can be any of above
None of the above

Q.18

Current and voltage are said to be in phase when:

their waveforms are both ac or both dc
they have the same amplitude and frequency
their waveforms cross through zero and reach positive and negative peaks at the same time
All of the above
None of the above

Q.19

Silicon atoms combine into an orderly pattern called a

Crystal
Covalent bond
Semiconductor
Valence orbit
None of the above

Q.20

The rotating coil of wire in an electric motor is called the:

armature
brush
commutator
loop
None of the above

Q.21

Which one of the following statements is true?

Current flows in a capacitor circuit only while ions are permitted to flow through the dielectric material
Current flows in a capacitor circuit only while the charge on the plates is large enough to force the dielectric to conduct electrons
Current can flow in a capacitor circuit, but not through the dielectric material itself
Power returned to the circuit is always greater than the power absorbed
None of the above

Q.22

Which one of the following statements is true for the currents in a series RC circuit?

The current always has the same amplitude and phase for every part of the circuit
The total current is equal to the sum of the currents for the resistance and capacitance
The total current is greater than the sum of the currents for the resistance and capacitance
The total current is less than the sum of the currents for the resistance and capacitance
None of the above

Q.23

A transistor has how many doped regions?

1
2
3
4
None of the above

Q.24

What is the total resistance of a series circuit that contains four resistors having values of 220W, 470W, 1W, and 1.2W?

692.2 Ohm
844.5 Ohm
3890 Ohm
1234 Ohm
None of the above

Q.25

Holes act like:

Atoms
Crystals
Negative charges
Positive charges
None of the above

Q.26

How may valence electrons does a silicon atom have?

0
1
2
4
None of the above

Q.27

The total inductance of a series inductor circuit is:

equal to the sum of the individual inductance values
equal to the sum of the individual inductive-reactance values
less than the value of the smallest inductor
equal to the source voltage divided by total current
None of the above

Q.28

Determine the resistance value and tolerance of a resistor that has the following color bands; first band is red, second band is red, third band is orange, and the fourth band is gold

220 Ohm, 5%
220 Ohm, 10%
22,000 Ohm, 5%
22, 000 Ohm, 10%
None of the above

Q.29

Which one of the following is most likely used for measuring the rate of electron flow?

Voltmeter
Ammeter
Wattmeter
Ohmmeter
None of the above

Q.30

The voltage across a 1N4001 is 0.93V when the current is 1A. What is the power dissipation of the diode for these values?

0.93 W
0.93 V
1:00 AM
9.3 W
None of the above

0 h : 0 m : 1 s