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Electrical Engineering
Electrical Inductors
Quiz 2
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Q.1
The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
1.8 mV
18 mV
180 mV
1.25 mV
Q.2
A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
91 mA
78 mA
57 mA
400 mA
Q.3
Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
219 kΩ
66 kΩ
660 kΩ
1.3 MO
Q.4
A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is
9.9 mH
Greater than 5 mH
9.9 mH or greater than 5 mH
Less than 0.6 mH
Q.5
Three 15 mH inductors are in series. The total inductance is
15 mH
30 mH
45 mH
5 mH
Q.6
An inductance of 0.08 µH is larger than
0.0000008 H
0.000000008 H
0.000008 H
0.00008 mH
Q.7
An inductance of 0.43 mH is smaller than
43 µH
430 µH
0.05 H
0.00043 H
Q.8
The voltage across a coil when di/dt = 20 mA/µs and L = 8 µH is
16 mV
160 mV
1.6 mV
2.5 mV
Q.9
What is the symbol for Inductance?
I
Z
XL
L
Q.10
Lamination of transformer core is made of
Cast Iron
Silicon Steel
Aluminium
Cast Steel
Q.11
If supply frequency of a transformer increases, the secondary output voltage of the transformer
Increase
Decrease
Remain the same
Any of the above
Q.12
Inductor stores energy in the form of
Electric field
Electromagnetic field
Magnetic field
None of the above
Q.13
To demonstrate static electricity, a teacher takes an inflated balloon and rubs it against his hair. The rubber balloon picks up electrons from his hair, which makes his hair have
a net negative charge
a magnetic force
a net positive charge
Q.14
------------------------ is created out of two metal plates and an insulating material called a dielectric.
An inductor
A capacitor
A fixed resistor
A variable resistor
Q.15
The production of a voltage across an inductor as a result of its own expanding or contracting magnetic field is called ____.
Flux density
Self-inductance
Counter emf
Faraday's second law
Q.16
Neutrons have a __________ charge.
Negative
Positive
Neutral
Q.17
Why do socks stick together when they come out of the dryer?
One has a negative charge and the other has a positive charge
Both have negative charges
Both have positive charges
Q.18
The closer the charges, the ___________ the force between them
closer
further
stronger
weaker
Q.19
If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?
A positive charge.
A negative charge.
A neutral charge
No charge at all
Q.20
What types of charges repel?
Positive and Positive
Positive and Neutral
Negative and Neutral
Neutral and Neutral
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