Q.1
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
0 h : 0 m : 1 s