#1
What is the unit of resistance?
Ampere (A)
Volt (V)
Ohm (Ω)
Watt (W)
#2
What is the unit of inductance?
Ohm (Ω)
Henry (H)
Farad (F)
Ampere (A)
#3
Which of the following materials is commonly used as the core of an inductor?
#4
What is the phenomenon called when the magnetic field collapses around an inductor?
Inductive kick
Magnetic decay
Back electromotive force (EMF)
Inductive reactance
#5
In a parallel RL circuit, what happens to the total impedance as the number of inductors increases?
It decreases
It increases
It remains constant
It becomes zero
#6
Which of the following materials exhibits the highest resistance?
#7
What is the total resistance of resistors connected in series?
Sum of individual resistances
Reciprocal of the sum of reciprocals of individual resistances
Product of individual resistances
Square root of the sum of squares of individual resistances
#8
Which of the following devices stores energy in the form of a magnetic field?
Resistor
Inductor
Capacitor
Diode
#9
What is the formula for calculating the voltage across an inductor?
V = L * I
V = I / L
V = R * I
V = I / R
#10
Which of the following statements about inductors in DC circuits is true?
Inductors block the flow of DC current
Inductors have no effect on DC circuits
Inductors allow DC current to pass through unimpeded
Inductors store energy in DC circuits
#11
Which of the following statements about inductors is correct?
Inductors block AC current but allow DC current to pass through
Inductors block DC current but allow AC current to pass through
Inductors block both AC and DC current
Inductors allow both AC and DC current to pass through unimpeded
#12
What happens to the inductive reactance of an inductor as frequency increases?
It decreases
It increases
It remains constant
It becomes zero
#13
What happens to the current through an inductor when the frequency of the applied voltage increases?
Current decreases
Current increases
Current remains constant
Current becomes zero
#14
In an RL circuit, what happens to the current when the inductor is suddenly connected to a DC source?
The current rises to its maximum value instantaneously
The current rises gradually
The current remains zero
The current decreases gradually
#15
What is the time constant of an RL circuit?
The time taken for the current to reach 63.2% of its maximum value
The time taken for the current to reach 50% of its maximum value
The time taken for the current to reach 100% of its maximum value
The time taken for the current to reach 90% of its maximum value
#16
What happens to the magnetic field around an inductor when current flows through it?
The magnetic field collapses
The magnetic field expands
The magnetic field remains constant
The magnetic field disappears
#17
In an RL circuit, what is the relationship between the voltage across the resistor and the voltage across the inductor when the circuit is connected to an AC source?
They are in phase
They are 180 degrees out of phase
Their phase relationship depends on the frequency of the AC source
Their phase relationship depends on the resistance of the circuit
#18
What is the relationship between the inductance (L) of an inductor and the number of turns in its coil?
Directly proportional
Inversely proportional
Not related
Exponential relationship
#19
What is the phase relationship between the voltage across an inductor and the current flowing through it in an AC circuit?
Voltage leads current by 90 degrees
Voltage lags current by 90 degrees
Voltage and current are in phase
Voltage and current are 180 degrees out of phase