Doubling the diameter of the coil in an inductor:

reduces the value of inductance by one-half

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

A atom that has a shortage of electrons in its outer orbit

The smallest particle of a substance that retains the properties of that substance

A atom that has a shortage of electrons in its outer orbit

A atom that has an excessive number of electrons in its outer orbit

A atom that flows whenever there is an imbalance of electrical charges between two points

Which one of the following statements best applies to a parallel RLC circuit?

The sum of the current is always less than the applied current

The voltage waveform for each component always has the same amplitude and phase as the applied voltage

The sum of the current is always less than the applied current

The current waveform for each component always has the same amplitude and phase as the applied current

Which one of the following statements best applies to a series RLC circuit?

The voltage waveform for each component always has the same amplitude and phase as the applied voltage

The current waveform for each component always has the same amplitude and phase as the applied current

The sum of the current is always less than the applied current

Which one of the following is a direct statement of Ohm's law?

The total resistance of a parallel circuit is less than the value of the smallest resistance

The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it

The total resistance of a parallel circuit is less than the value of the smallest resistance

The algebraic sum of voltages in a loop is equal to zero

The algebraic sum of currents entering and leaving a point is equal to zero

Which one of the following phrases most accurately describes a purely inductive circuit?

Combinations of resistance and inductive reactance provide any opposition to current flow

Resistances provide the only opposition to current flow

Inductive reactance provides the only opposition to current flow

Combinations of resistance and inductive reactance provide any opposition to current flow

The ac voltage lags the current by 90 degree

Which one of the following statements regarding ac circuits is correct?

Current leads the voltage through a resistor

Current and voltages are in phase through a resistor

Current leads the voltage through a resistor

Current lags the voltage through a resistor

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

parallel RLC circuit operated above its resonant frequency

The core of an electromagnet is said to be in saturation when:

frequent changes in the direction of current through the coil causes heating effects in the core material

the core is permitted to move freely within the coil

an increase in current through the coil causes no further increase in the mmf

frequent changes in the direction of current through the coil causes heating effects in the core material

changing the polarity of the current in the coil changes the polarity of the magnetic field around the core

Which one of the following phrasers best describes flux density?

The rate of change of the number of lines of magnetic force

The concentration of lines of magnetic force

The rate of change of the number of lines of magnetic force

The opposition to a build-up of magnetic fields

The force that maintains lines of force

What is a negative ion?

An atom that contains more protons than electrons

An atom that contains more electrons than neutrons

An atom that contains more protons than neutrons

An atom that contains more electrons than protons

An atom that contains more protons than electrons

Which one of the following statements is true for current flowing in a series circuit?

The total current in a series circuit is equal to the total voltage multiplied by the total resistance

The amount of current flow through each part of a series circuit can be different, depending on the resistance of each part and the amount of voltage applied to it

The total current in a series circuit is equal to the sum of the currents flowing through the individual components in the circuit

The same current flows through every part of a series circuit

The total current in a series circuit is equal to the total voltage multiplied by the total resistance

The north pole of a magnet is the one:

that would be repelled by the south pole of another magnet

that has its molecules arranged in a random pattern

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

that would be repelled by the south pole of another magnet

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

Reducing the amount of current through an inductor:

reduces the value of inductance by one-half

multiplies the value of inductance by four

multiplies the value of inductance by two

has no effect on the inductance

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

The total resistance of a parallel circuit is equal to the total voltage

The total resistance is equal to the sum of the individual resistances in a parallel circuit.

The total resistance of a parallel circuit is always less than the value of the smallest resistance

The total resistance of a parallel circuit is equal to the total voltage

The total resistance in a parallel circuit is equal to the average value of the individual resistances

The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:

No more than 10% less than the primary current

Which one of the following phrases best describes residual magnetism?

The force of attraction between the poles of a permanent and temporary magnetic field

Magnetism that remains in the core of an electromagnet after the current through the coil is turned off

The force of attraction between the poles of a permanent and temporary magnetic field

The amount of magnetic flux that is not confined to the core material of an electromagnet

The circular magnetic field that surrounds a conductor carrying a current

The total capacitance of a series capacitor circuit is:

equal to the sun of the individual capacitive-reactance values

equal to the sum of the individual capacitance values

equal to the source voltage divided by total current

less than the value of the smallest capacitor

What is a free electron?

An electron that has been freed from its parent atom

An electron that has no electrical charge

An electron that has twice the amount of charge of a normal electron

231 + Mcqs in Electronic Principles in Computer Science Page 4 McqOptions

151.	The basic unit of measurement for current is the:
A.	volt
B.	watt
C.	ampere
D.	ohm
Answer» D. ohm

Discussion

152.	Doubling the diameter of the coil in an inductor:
A.	multiplies the value of inductance by two
B.	reduces the value of inductance by one-half
C.	reduces the value of inductance by one-fourth
D.	multiplies the value of inductance by four
Answer» B. reduces the value of inductance by one-half

Discussion

153.	Molecule is
A.	The smallest particle of a substance that retains the properties of that substance
B.	A atom that has a shortage of electrons in its outer orbit
C.	A atom that has an excessive number of electrons in its outer orbit
D.	A atom that flows whenever there is an imbalance of electrical charges between two points
Answer» B. A atom that has a shortage of electrons in its outer orbit

Discussion

154.	If a load resistance is 1 kW, a stiff voltage source has a resistance of
A.	At least 10 Ohm
B.	less than 10 Ohm
C.	More than 100 k Ohm
D.	Less than 100 k Ohm
Answer» C. More than 100 k Ohm

Discussion

155.	A battery is a device composed of one or more:
A.	chemical cells
B.	voltage generators
C.	solar cells
D.	piezoeletric cells
Answer» B. voltage generators

Discussion

156.	Which one of the following devices is most often used for measuring opposition to current flow in a circuit?
A.	Ammeter
B.	Voltmeter
C.	Ohmmeter
D.	Wattmeter
Answer» D. Wattmeter

Discussion

157.	How may valence electrons does a silicon atom have?
A.	0
B.	1
C.	2
D.	4
Answer» E.

Discussion

158.	Absolute Zero temperature equals
A.	0o C
B.	-273o C
C.	-276o C
D.	25o C
Answer» C. -276o C

Discussion

159.	A transistor has a current gain of 125 and a base current of 30 ¬µA. What is the collector current?
A.	3.75 mA
B.	3.2 mA
C.	0.05 mA
D.	13 mA
Answer» B. 3.2 mA

Discussion

160.	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?
A.	P = I2R
B.	P = IE
C.	P = E2/R
D.	I = P/E
Answer» D. I = P/E

Discussion

161.	What is the total resistance of a series circuit that contains four resistors having values of 220W, 470W, 1W, and 1.2W?
A.	692.2 Ohm
B.	844.5 Ohm
C.	3890 Ohm
D.	1234 Ohm
Answer» B. 844.5 Ohm

Discussion

162.	Which one of the following statements best applies to a parallel RLC circuit?
A.	The voltage waveform for each component always has the same amplitude and phase as the applied voltage
B.	The sum of the current is always less than the applied current
C.	The current waveform for each component always has the same amplitude and phase as the applied current
D.	All of the above
Answer» B. The sum of the current is always less than the applied current

Discussion

163.	Which one of the following statements best applies to a series RLC circuit?
A.	The voltage waveform for each component always has the same amplitude and phase as the applied voltage
B.	The current waveform for each component always has the same amplitude and phase as the applied current
C.	All of the above
D.	The sum of the current is always less than the applied current
Answer» C. All of the above

Discussion

164.	The number of free electrons and holes in intrinsic semiconductor increases when the temperature
A.	Decreases
B.	Increases
C.	Stays the same
D.	0oC
Answer» C. Stays the same

Discussion

165.	Which one of the following is a direct statement of Ohm's law?
A.	The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
B.	The total resistance of a parallel circuit is less than the value of the smallest resistance
C.	The algebraic sum of voltages in a loop is equal to zero
D.	The algebraic sum of currents entering and leaving a point is equal to zero
Answer» B. The total resistance of a parallel circuit is less than the value of the smallest resistance

Discussion

166.	A transistor has how many doped regions?
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

167.	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?
A.	P = I2R
B.	P = IE
C.	P = E2/R
D.	I = P/E
Answer» E.

Discussion

168.	The direction of electron current flow is:
A.	from right to left
B.	from positive to negative
C.	from negative to positive
D.	from neutral to positive
Answer» D. from neutral to positive

Discussion

169.	A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?
A.	60 Ohm
B.	50 Ohm
C.	100 Ohm or more
D.	10 Ohm
Answer» D. 10 Ohm

Discussion

170.	The merging of a free electron and a hole is called
A.	Covalent bonding
B.	Lifetime
C.	Recombination
D.	Thermal energy
Answer» D. Thermal energy

Discussion

171.	Which one of the following phrases most accurately describes a purely inductive circuit?
A.	Resistances provide the only opposition to current flow
B.	Inductive reactance provides the only opposition to current flow
C.	Combinations of resistance and inductive reactance provide any opposition to current flow
D.	The ac voltage lags the current by 90 degree
Answer» C. Combinations of resistance and inductive reactance provide any opposition to current flow

Discussion

172.	What is the algebraic sum of this series of values:+2, -3, -6,+4?
A.	-6
B.	-3
C.	0
D.	2
Answer» C. 0

Discussion

173.	The direction of conventional current flow is:
A.	from negative to positive
B.	from positive to negative
C.	from left to right
D.	from neutral to positive
Answer» C. from left to right

Discussion

174.	What is the barrier potential of a silicon diode at room temperature?
A.	0.7V
B.	0.3V
C.	1 V
D.	2 m V per degree Celsius
Answer» B. 0.3V

Discussion

175.	The equivalent of 1 micro A is:
A.	10000A
B.	1000 A
C.	one-millionth of an ampere
D.	one million amperes
Answer» D. one million amperes

Discussion

176.	Which one of the following statements regarding ac circuits is correct?
A.	Current and voltages are in phase through a resistor
B.	Current leads the voltage through a resistor
C.	Current lags the voltage through a resistor
D.	All of the above
Answer» B. Current leads the voltage through a resistor

Discussion

177.	When operating above its resonant frequency, a parallel RLC circuit has the characteristics of a:
A.	parallel RL circuit
B.	parallel RC circuit
C.	parallel RLC circuit operated above its resonant frequency
D.	purely resistive circuit
Answer» C. parallel RLC circuit operated above its resonant frequency

Discussion

178.	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?
A.	0.17 V
B.	10.17 V
C.	20 V
D.	18.8 V
Answer» B. 10.17 V

Discussion

179.	The core of an electromagnet is said to be in saturation when:
A.	the core is permitted to move freely within the coil
B.	an increase in current through the coil causes no further increase in the mmf
C.	frequent changes in the direction of current through the coil causes heating effects in the core material
D.	changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
Answer» C. frequent changes in the direction of current through the coil causes heating effects in the core material

Discussion

180.	The basic unit of measurement for resistance is the:
A.	volt
B.	ampere
C.	ohm
D.	watt
Answer» D. watt

Discussion

181.	Which one of the following phrasers best describes flux density?
A.	The concentration of lines of magnetic force
B.	The rate of change of the number of lines of magnetic force
C.	The opposition to a build-up of magnetic fields
D.	The force that maintains lines of force
Answer» B. The rate of change of the number of lines of magnetic force

Discussion

182.	What is the power dissipation of a resistance that has 24 V dropped across it and 0.25 A flowing through it?
A.	3 W
B.	6 W
C.	64 W
D.	122 W
Answer» C. 64 W

Discussion

183.	How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?
A.	0.02 A
B.	0.955 A
C.	0.41666666666667
D.	2.02 A
Answer» C. 0.41666666666667

Discussion

184.	What is a negative ion?
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
Answer» D. An atom that contains more protons than electrons

Discussion

185.	Which one of the following statements is true for current flowing in a series circuit?
A.	The amount of current flow through each part of a series circuit can be different, depending on the resistance of each part and the amount of voltage applied to it
B.	The total current in a series circuit is equal to the sum of the currents flowing through the individual components in the circuit
C.	The same current flows through every part of a series circuit
D.	The total current in a series circuit is equal to the total voltage multiplied by the total resistance
Answer» D. The total current in a series circuit is equal to the total voltage multiplied by the total resistance

Discussion

186.	The net charge of a neutral copper atom is
A.	0
B.	1
C.	-1
D.	4
Answer» C. -1

Discussion

187.	Holes are the minority carriers in which type of semiconductor?
A.	Extrinsic
B.	Intrinsic
C.	n-type
D.	p-type
Answer» D. p-type

Discussion

188.	What is the capacitive reactance of a 0.1 micro F capacitor that is operating at 1000 Hz?
A.	less than 1 Ohm
B.	1590 Ohm
C.	312 Ohm
D.	690 Ohm
Answer» C. 312 Ohm

Discussion

189.	The north pole of a magnet is the one:
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
Answer» C. that would be repelled by the south pole of another magnet

Discussion

190.	Reducing the amount of current through an inductor:
A.	reduces the value of inductance by one-half
B.	multiplies the value of inductance by four
C.	multiplies the value of inductance by two
D.	has no effect on the inductance
Answer» E.

Discussion

191.	Which one of the following statements is true for resistance in a parallel circuit?
A.	The total resistance is equal to the sum of the individual resistances in a parallel circuit.
B.	The total resistance of a parallel circuit is always less than the value of the smallest resistance
C.	The total resistance of a parallel circuit is equal to the total voltage
D.	The total resistance in a parallel circuit is equal to the average value of the individual resistances
Answer» C. The total resistance of a parallel circuit is equal to the total voltage

Discussion

192.	The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:
A.	One-half the primary current
B.	Same as the primary current
C.	Twice the primary current
D.	No more than 10% less than the primary current
Answer» B. Same as the primary current

Discussion

193.	Holes act like:
A.	Atoms
B.	Crystals
C.	Negative charges
D.	Positive charges
Answer» E.

Discussion

194.	Which one of the following phrases best describes residual magnetism?
A.	Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
B.	The force of attraction between the poles of a permanent and temporary magnetic field
C.	The amount of magnetic flux that is not confined to the core material of an electromagnet
D.	The circular magnetic field that surrounds a conductor carrying a current
Answer» B. The force of attraction between the poles of a permanent and temporary magnetic field

Discussion

195.	The total capacitance of a series capacitor circuit is:
A.	equal to the sun of the individual capacitive-reactance values
B.	equal to the sum of the individual capacitance values
C.	equal to the source voltage divided by total current
D.	less than the value of the smallest capacitor
Answer» E.

Discussion

196.	The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?
A.	250 ŒºA
B.	350 ŒºA
C.	0.25 ŒºA
D.	300 ŒºA
Answer» B. 350 ŒºA

Discussion

197.	When the graph of current versus voltage is a straight line, the device is referred to as
A.	Active
B.	Linear
C.	Nonlinear
D.	Bipolar
Answer» C. Nonlinear

Discussion

198.	What is a free electron?
A.	An electron that has been freed from its parent atom
B.	An electron that costs nothing
C.	An electron that has no electrical charge
D.	An electron that has twice the amount of charge of a normal electron
Answer» B. An electron that costs nothing

Discussion

199.	If the base supply voltage increases, the Q point moves
A.	down
B.	up
C.	nowhere
D.	off the load line
Answer» B. up

Discussion

200.	What form of energy is used to maintain an imbalance of charges between the terminals of a battery?
A.	Electronical energy
B.	Mechanical energy
C.	Chemical energy
D.	Solar energy
Answer» D. Solar energy

Discussion

Explore topic-wise MCQs in Computer Science.

The basic unit of measurement for current is the:

Doubling the diameter of the coil in an inductor:

Molecule is

If a load resistance is 1 kW, a stiff voltage source has a resistance of

A battery is a device composed of one or more:

Which one of the following devices is most often used for measuring opposition to current flow in a circuit?

How may valence electrons does a silicon atom have?

Absolute Zero temperature equals

A transistor has a current gain of 125 and a base current of 30 ¬µA. What is the collector current?

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?

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

Which one of the following statements best applies to a parallel RLC circuit?

Which one of the following statements best applies to a series RLC circuit?

The number of free electrons and holes in intrinsic semiconductor increases when the temperature

Which one of the following is a direct statement of Ohm's law?

A transistor has how many doped regions?

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?

The direction of electron current flow is:

A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?

The merging of a free electron and a hole is called

Which one of the following phrases most accurately describes a purely inductive circuit?

What is the algebraic sum of this series of values:+2, -3, -6,+4?

The direction of conventional current flow is:

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

The equivalent of 1 micro A is:

Which one of the following statements regarding ac circuits is correct?

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

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?

The core of an electromagnet is said to be in saturation when:

The basic unit of measurement for resistance is the:

Which one of the following phrasers best describes flux density?

What is the power dissipation of a resistance that has 24 V dropped across it and 0.25 A flowing through it?

How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?

What is a negative ion?

Which one of the following statements is true for current flowing in a series circuit?

The net charge of a neutral copper atom is

Holes are the minority carriers in which type of semiconductor?

What is the capacitive reactance of a 0.1 micro F capacitor that is operating at 1000 Hz?

The north pole of a magnet is the one:

Reducing the amount of current through an inductor:

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

The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:

Holes act like:

Which one of the following phrases best describes residual magnetism?

The total capacitance of a series capacitor circuit is:

The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?

When the graph of current versus voltage is a straight line, the device is referred to as

What is a free electron?

If the base supply voltage increases, the Q point moves

What form of energy is used to maintain an imbalance of charges between the terminals of a battery?