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Electrical Engineering
Electrical Inductors
Quiz 3
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Q.1
The transfer of what type of atomic particle is responsible for the static charges on objects?
neutrons
protons
electrons
none of these
Q.2
Charged objects can be attracted to:
Neutral objects
Objects with the opposite charge
Both
Q.3
Which of the following does not change in an ordinary transformer........
.Frequency
.Voltage
.Current
Any of the above
Q.4
Mutual inductance between two magnetically coupled coils depends on
Permeability of the core material
Number of turns of the coils
Cross sectional area of their common core
All of the above
Q.5
If in an iron cored coil the iron core is removed so as to make the air cored coil, the inductance of the coil will be
More
Less
The same
None of these
Q.6
The center of an inductor, which is either made from insulating or conducting material is called the ____.
henry
dielectric
core
center
Q.7
Inductance value is also affected by permeability, , cross sectional area and____________.
impedance
the alternating current
the number of turns
impedance
Q.8
Capacitors are identified by which two values?
Farads and watts
Maxwells and current
Farads and voltage
Watts and henries
Q.9
What is the unit of measurement for capacitance?
Maxwells
Farads
Henries
Watts
Q.10
The ability of a capacitor to store a charge is called __________.
Resistance
Capacitance
Inductance
Dielectric constant
Q.11
Two common inductor cores are ___________.
air and iron
carbon and copper
plastic and Teflon
desiccant and lead
Q.12
Which of the following is NOT a dielectric material ?
air
ceramic
glass
copper
Q.13
If the capacitance of a capacitor is 47μF, and the voltage difference across the capacitor terminals is 6V, then the energy stored in that capacitor is:
846×10-6Joule
7.23×10-3 Joule
6.76×10-5Joule
5.94×10-2Joule
Q.14
How much energy is stored whenA flowsthrough aH inductor?
500 J
10000 J
12500 J
25000 J
50000 J
Q.15
An inductor with an inductance of 5mH is connected in series with aohm resistor.What is the time constant of the inductor?
2.5 x 10^-4 s
4 x 10^4 s
0.1s
100s
Q.16
With respect to the capacitor, which relationship is true?
C = Q/V
V = C×Q
Q = C/V
Q = V/C
Q.17
What is the voltage across the plates of the capacitor if the capacitance ismicro Farads and the Charge stored ismicro Coulombs?
0.333 V
3 V
300 V
0.3 V
Q.18
Which of the following is the unit of inductance?
Ohm
Henry
Ampere turns
Webers/meter
Q.19
The electrical energy consumed by a coil is stored in the form of:
an electrical field
a force field
an electrostatic field
a magnetic field
Q.20
The voltage induced across an inductor as its magnetic field collapses is called ____.
Counter emf
Transition voltage
Reverse voltage
Counter voltage
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