The concept of a magnetic field being formed around a conductor when current flows through it is called __________.
capacitance
electromagnetism
flux
All of the above
None of the above
Q.2.
Which of the following is not an example of an electromagnetic device?
Solenoid
Relay
Resistor
Motor
Q.3.
The trimmer capacitor is used for..
coupling
filtering
decoupling
fine tuning
Q.4.
The total inductance value of two inductorsandof connected in series is…
05 H
10 H
15 H
25 H
Q.5.
Which unit is used to measure capacitance value?
Mho
Ohm
Farad
Henry
Q.6.
Which value is equal to one picofarad?
106 Farad
1012 Farad
10-6 Farad
10-12 Farad
Q.7.
Which property of the capacitor stores electrical energy in electrostatic field?
Dielectric
Capacitance
Straycapacitance
Capacitivereactance
Q.8.
What is the lowest voltage level of discharging the lead-acid battery?
1.2 V
1.5 V
1.7 V
1.85 V
Q.9.
What is the percentage of sulphuric acid in electrolyte used for lead-acid batteries?
12%
25%
27%
40%
Q.10.
What is the total voltage of six 1.5 V cells, connected in series?
3 VDC
6 VDC
9 VDC
12 VDC
Q.11.
A 10-turn ideal solenoid has an inductance of 4.0 mH. To generate an emf of 2.0 V the current should change at a rate of:
0 A/s
0.5 A/s
50 A/s
250 A/s
500 A/s
Q.12.
Which energy is converted by the battery to produce electricity?
Electricalenergy into light energy
Chemical energyinto electrical energy
Mechanicalenergy into electrical energy
Electricalenergy into mechanical energy
Q.13.
A 10-turn ideal solenoid has an inductance of 3.5 mH. When the solenoid carries a current of 2.0 A the magnetic flux through each turn is:
0 Wb
3.5 x 10^–4 Wb
7.0 x 10^–4 Wb
7.0 x 10^–3 Wb
7.0 x10^–2 Wb
Q.14.
Which of the following has the largest inductance?
A solenoid of radius 1 cm, length 5 cm, and with 100 turns of wire per centimeter
A solenoid of radius 3 cm, length 1 cm, and with 100 turns of wire per centimeter
A solenoid of radius 2 cm, length 2 cm, and with 100 turns of wire per centimeter
A solenoid of radius 1 cm, length 1 cm, and with 200 turns of wire per centimeter
A solenoid of radius 2 cm, length 5 cm, and with 100 turns of wire per centimeter
Q.15.
A 7.2 mH inductor is connected to a current source. What is the magnitude of the voltage in the inductor at time 𝑡 = 3.0 𝑠 if the current is 𝐼(𝑡) = 5.0 + 7.− 2.0𝑡^2?
22 mV
36 mV
58 mV
90 mV
230 mV
Q.16.
A long narrow solenoid has length ℓ and a total of N turns, each of which has cross-sectional area A. Its inductance is:
μ0 N^2 Aℓ
μ0 N^2 A/ℓ
μ0 NA/ℓ
μ0 N^2 ℓ/A
none of these
Q.17.
How much energy is stored in a long solenoid withturns, length 𝐿 = 3.2 𝑚, and cross sectional area 𝐴 =𝑐𝑚^when the current in it is 𝐼 =𝐴?
1.10 𝑚𝐽
1.10 𝑘𝐽
9.1 1𝑘𝐽
5.21 𝑘𝐽
7.48 𝑘𝐽
Q.18.
How large a current must flow through a 1.2 H inductance so that the energy stored isJ?
1.17 A
2.31 A
25.6 A
44.2 A
107.1 A
Q.19.
A 5.6 mH inductor is connected to a current source.What is the magnitude of the voltage in the inductorat time 𝑡 = 4.0 𝑠 if the current is 𝐼(𝑡) = 10.0 + 9.−3.0𝑡^2?
11 mV
22 mV
84 mV
58 mV
185 mV
Q.20.
Energy can be stored in many ways. What is theprimary energy storage form of an inductor?
Kinetic
Electric field
Magnetic field
Gravitational field
Spring displacement
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