19 Jun 2025 Electrician 1st Sem – NSQF – Module 5 – Magnetism and Capacitors MOCK TEST by admin | posted in: Uncategorized | 0 0% Question 1 of 37 1. What is the unit of permeance? Weber/Ampere turns Ampere - turns Weber/Square metre Ampere turns/Weber Loading... Question 1 of 37Question 2 of 37 2. Which factor is determining the value of capacitance in capacitor? Shape of the plates Area of the plates Thickness of the plates Material of the plates Loading... Question 2 of 37Question 3 of 37 3. What is the unit of Magneto Motive Force (MMF)? Ampere - M Ampere / turns Ampere - turns Ampere / M2 Loading... Question 3 of 37Question 4 of 37 4. What will happen, if the polarized electrolytic capacitor is reversely connected? Explode due to excessive heat Current is reduced in the circuit No effect on the capacitor Value of capacitance will be increased Loading... Question 4 of 37Question 5 of 37 5. What precaution to be taken before connecting the different voltage rating capacitors in series? Break down voltage of each capacitor must be same Total capacitors value must be less than the lowest value of capacitor All the capacitors must be same manufacturer Each capacitors voltage drop must be less than its voltage rating Loading... Question 5 of 37Question 6 of 37 6. Which defines the flux density is always lagging behind the magnetising force? Hysteresis Residual magnetism Magnetic intensity Magnetic induction Loading... Question 6 of 37Question 7 of 37 7. How the value of capacitance can be decreased? Using high dielectric constant material Increasing the plate area Increasing the distance between the plates Increasing the resistance of the plates Loading... Question 7 of 37Question 8 of 37 8. What is the function of dielectric insulator in capacitor? Increases the strength of capacitance Helps to hold the charge in capacitor for long period Protects from short circuit between the plates Prevents any current flow between plates Loading... Question 8 of 37Question 9 of 37 9. Which electrical quantity is directly proportional to the eddy current? Resistance Frequency Current Voltage Loading... Question 9 of 37Question 10 of 37 10. What is the unit of capacitance? Henry Mho Coulomb Farad Loading... Question 10 of 37Question 11 of 37 11. What is the similar term in magnetic circuit for "conductance" in electrical circuit? Reluctivity Permeability Permeance Reluctance Loading... Question 11 of 37Question 12 of 37 12. What is the effect on surrounding metal placed in a magnetic field? Hysteresis Eddy current Skin effect Dielectric stress Loading... Question 12 of 37Question 13 of 37 13. Which is a paramagnetic substance? Glass Steel Water Air Loading... Question 13 of 37Question 14 of 37 14. How can you increase the pulling strength of an electromagnet? Increase the field intensity Reduce the number of turns in the coil Reduce the current in the coil Increase the B-H curve of the material Loading... Question 14 of 37Question 15 of 37 15. Which method of magnetization is used to make commercial purpose permanent magnets? Divided touch method Double touch method Induction method Single touch method Loading... Question 15 of 37Question 16 of 37 16. In which device the air capacitors are used? Radio receiver TV tuner Oscillator Loudspeaker Loading... Question 16 of 37Question 17 of 37 17. What is the total inductance if 3 inductors (L1, L2 and L3) are connected in series? LT = (L1 + L2 + L3)/(L1 x L2 x L3) LT = L1 x L2 x L3 LT = 1/(1/L1 + 1/L2 + 1/L3) LT = L1 + L2 + L3 Loading... Question 17 of 37Question 18 of 37 18. Which property of magnet is illustrated? Directive property Poles existing property Induction property Saturation property Loading... Question 18 of 37Question 19 of 37 19. What is the effect of the electrolytic capacitor, if open circuit fault occurs? It will function normally It will burst at once It will not function It will become leaky Loading... Question 19 of 37Question 20 of 37 20. Calculate the total capacitance value in the circuit. 70 μF 0.16 μF 6 μF 30 μF Loading... Question 20 of 37Question 21 of 37 21. What is the capacitance value of a capacitor that requires 0.5 coulomb to charge to 35 volt? 0.25 F 0.14 F 0.025 F 0.014 F Loading... Question 21 of 37Question 22 of 37 22. Which material is the paramagnetic substance? Cleat wiring Bismuth Graphite Copper Loading... Question 22 of 37Question 23 of 37 23. What indicates the shape of a BH curve (Hysteresis loop) of material? Magnetic properties of the material Pulling power of the magnetic material Reluctance of the material Field intensity of the substance Loading... Question 23 of 37Question 24 of 37 24. What is the S.I unit of Flux density? Ampere-turns Tesla Weber/metre Weber Loading... Question 24 of 37Question 25 of 37 25. What is the unit of Reluctance? Ampere turns / Weber Ampere turns / metre2 Weber / metre2 Weber / metre Loading... Question 25 of 37Question 26 of 37 26. Which type of capacitors are used in RF coupling circuit? Monolithic Tantalum Metalized poly propylene Electrolytic Loading... Question 26 of 37Question 27 of 37 27. Which rule is applied to find the direction of magnetic fields in a solenoid coil? Cork screw rule Flemings right hand rule Flemings left hand rule Right hand palm rule Loading... Question 27 of 37Question 28 of 37 28. What is the part marked as 'X' in B.H curve? Saturation point Magnetizing force Coercivity Residual magnetism Loading... Question 28 of 37Question 29 of 37 29. Which type of capacitor is used for space electronics? Plastic film type Electrolytic-Tantalum type Electrolytic-Aluminium type Ceramic disc type Loading... Question 29 of 37Question 30 of 37 30. Which is the diamagnetic substance? Platinum Steel Water Air Loading... Question 30 of 37Question 31 of 37 31. What is the effect of inductance if the distance between the turns increases? Becomes zero Increases Remains same Decreases Loading... Question 31 of 37Question 32 of 37 32. Which is the cause for changing the permeability? Field intensity Flux density Magneto motive force Length Loading... Question 32 of 37Question 33 of 37 33. Calculate the total value of capacitance of series capacitor circuit. 4μfd 15μfd 10μfd 40μfd Loading... Question 33 of 37Question 34 of 37 34. Which is the correct expression of capacitance 'C' if the electric charge is 'Q' and the voltage is 'V'? C = 1/QV C = Q/V C = QV C = V/Q Loading... Question 34 of 37Question 35 of 37 35. Which factor affects the polarity of the electromagnet? Strength of current Strength of the magnetic field Direction of current Length of the coil Loading... Question 35 of 37Question 36 of 37 36. Which is the diamagnetic substance? Manganese Wood Platinum Nickel Loading... Question 36 of 37Question 37 of 37 37. What will be the change in value of capacitance if the distance of the plates are decreased in the capacitor? Increases Becomes zero Remains same Decreases Loading... Question 37 of 37 Loading...
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