1. Calculate the total capacitance value in the circuit.
B 6 µF
C 30 µF
D 70 µF
2. What is the unit of capacitance?
A Mho
B Henry
C Farad
D Coulomb
3. What is the capacitance value of a capacitor that requires 0.5 coulomb to charge to 35 volt?
A 0.014 F
B 0.025 F
C 0.14 F
D 0.25 F
4. How the value of capacitance can be decreased?
A Increasing the plate area
B Increasing the resistance of the plates
C Increasing the distance between the plates
D Using high dielectric constant material
5. Which is the diamagnetic substance?
A Air
B Steel
C Water
D Platinum
6. Which factor affects the polarity of the electromagnet?
A Length of the coil
B Direction of current
C Strength of current
D Strength of the magnetic field
7. What is the unit of Magneto Motive Force (MMF)?
A $\displaystyle Ampere/m^{2}$
B $\displaystyle Ampere-m$
C $\displaystyle Ampere-turns$
D $\displaystyle Ampere/turns$
8. What is the total inductance if 3 inductors (L1, L2 and L3) are connected in series?
A $\displaystyle L_{T}=L_{1}\times L_{2}\times L_{3}$
B $\displaystyle L_{T}=L_{1}+L_{2}+L_{3}$
C $\displaystyle L_{T}=\frac{1}{L_{1}}+\frac{1}{L_{2}}+\frac{1}{L_{3}}$
D $\displaystyle L_{T}=\frac{1}{L_{1}+L_{2}+L_{3}}$
9. What is the unit of permeance?
A Ampere - turns
B Weber/Ampere turns
C Ampere turns/Weber
D Weber/Square metre
10. Which rule is applied to find the direction of magnetic fields in a solenoid coil?
A Cork screw rule
B Right hand palm rule
C Flemings left hand rule
D Flemings right hand rule
11. Calculate the total value of capacitance of series capacitor circuit.
B 10µfd
C 15µfd
D 40µfd
12. What precaution to be taken before connecting the different voltage rating capacitors in series?
A All the capacitors must be same manufacturer
B Each capacitors voltage drop must be less than its voltage rating
C Total capacitors value must be less than the lowest value of capacitor
D Break down voltage of each capacitor must be same
13. Which material is the paramagnetic substance?
A Cleat wiring
B Copper
C Bismuth
D Graphite
14. What is the part marked as X in B.H curve?
B Saturation point
C Magnetizing force
D Residual magnetism
15. What is the similar term in magnetic circuit for “conductance” in electrical circuit?
A Reluctivity
B Permeance
C Reluctance
D Permeability
16. What is the unit of Reluctance?
A $\displaystyle Weber/metre^{2}$
B $\displaystyle Weber/metre$
C $\displaystyle Ampere\: turns/Weber$
D $\displaystyle Ampere\: turns / metre^{2}$
17. Which is the correct expression of capacitance C if the electric charge is Q and the voltage is V?
A $\displaystyle C=Q/V$
B $\displaystyle C=V/Q$
C $\displaystyle C=VQ$
D $\displaystyle C=\sqrt{VQ}$
18. How can you increase the pulling strength of an electromagnet?
A Increase the field intensity
B Reduce the current in the coil
C Reduce the number of turns in the coil
D Increase the B-H curve of the material
19. Which defines the flux density is always lagging behind the magnetizing force?
A Hysteresis
B Magnetic intensity
C Magnetic induction
D Residual magnetism
20. What is the effect on surrounding metal placed in a magnetic field?
A Hysteresis
B Skin effect
C Eddy current
D Dielectric stress
21. In which device the air capacitors are used?
A TV tuner
B Oscillator
C Loudspeaker
D Radio receiver
22. What will happen, if the polarized electrolytic capacitor is reversely connected?
A No effect on the capacitor
B Explode due to excessive heat
C Current is reduced in the circuit
D Value of capacitance will be increased
23. Which is the diamagnetic substance?
A Wood
B Nickel
C Platinum
D Manganese
24. What is the S.I unit of Flux density?
A Tesla
B Weber
C Weber/metre
D Ampere-turns
25. What indicates the shape of a BH curve (Hysteresis loop) of material?
A Reluctance of the material
B Field intensity of the substance
C Magnetic properties of the material
D Pulling power of the magnetic material
26. Which electrical quantity is directly proportional to the eddy current?
A Voltage
B Current
C Frequency
D Resistance
27. Which is the cause for changing the permeability?
A Length
B Flux density
C Field intensity
D Magneto motive force
28. Which type of capacitor is used for space electronics?
A Plastic film type
B Ceramic disc type
C Electrolytic-Aluminum type
D Electrolytic-Tantalum type
29. What is the effect of the electrolytic capacitor, if open circuit fault occurs?
A It will not function
B It will burst at once
C It will become leaky
D It will function normally
30. What will be the change in value of capacitance if the distance of the plates are decreased in the capacitor?
A Becomes zero
B Remains same
C Decreases
D Increases
31. Which property of magnet is illustrated?
B Induction property
C Saturation property
D Poles existing property
32. Which is a paramagnetic substance?
A Air
B Steel
C Glass
D Water
33. Which method of magnetization is used to make commercial purpose permanent magnets?
A Induction method
B Single touch method
C Double touch method
D Divided touch method
34. What is the effect of inductance if the distance between the turns increases?
A Increases
B Decreases
C Becomes zero
D Remains same
35. What is the function of dielectric insulator in capacitor?
A Increases the strength of capacitance
B Prevents any current flow between plates
C Protects from short circuit between the plates
D Helps to hold the charge in capacitor for long period
36. Which factor is determining the value of capacitance in capacitor?
A Area of the plates
B Shape of the plates
C Material of the plates
D Thickness of the plates
37. Which type of capacitors are used in RF coupling circuit?
A Tantalum
B Monolithic
C Electrolytic
D Metalized poly propylene
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