MAGNETISM AND CAPACITOR

What is the unit of capacitance? Mho Henry Farad Coulomb

What is the capacitance value of a capacitor that requires 0.5 coulomb to charge to 35 volt? 0.014 F 0.025 F 0.14 F 0.25 F

How can the value of capacitance be decreased? Increasing the plate area Increasing the resistance of the plates Increasing the distance between the plates Using high dielectric constant material

Which is the diamagnetic substance? Air Steel Water Platinum

Which factor affects the polarity of the electromagnet? Length of the coil Direction of current Strength of current Strength of the magnetic field

What is the unit of Magnetomotive Force (MMF)? Ampere / M2 Ampere - M Ampere - turns Ampere / turns

What is the unit of permeance? Ampere - turns Weber/Ampere turns Ampere turns/Weber Weber/Square meter

Which rule is applied to find the direction of magnetic fields in a solenoid coil? Cork screw rule Right hand palm rule Flemings left hand rule Flemings right hand rule

What precaution to be taken before connecting the different voltage rating capacitors in series? All the capacitors must be same manufacturer Each capacitors voltage drop must be less than its voltage rating Total capacitors value must be less than the lowest value of capacitor Break down voltage of each capacitor must be same

Which material is the paramagnetic substance? Cleat wiring Copper Bismuth Graphite

What is the similar term in magnetic circuit for conductance in electrical circuit? Reluctivity Permeance Reluctance Permeability

What is the unit of Reluctance? Weber / metre2 Weber / meter Ampere turns / Weber Ampere turns / metre2

Which is the correct expression of capacitance C if the electric charge is Q and the voltage is V? C = Q/V C = V/Q C = VQ C = √VQ

How can you increase the pulling strength of an electromagnet? Increase the field intensity Reduce the current in the coil Reduce the number of turns in the coil Increase the B-H curve of the material

Which defines the flux density is always lagging behind the magnetizing force? Hysteresis Magnetic intensity Magnetic induction Residual magnetism

What is the effect on surrounding metal placed in a magnetic field? Hysteresis Skin effect Eddy current Dielectric stress

In which device the air capacitors are used? TV tuner Oscillator Loudspeaker Radio receiver

Which is the diamagnetic substance? Wood Nickel Platinum Manganese

What is the S.I unit of Flux density? Tesla Weber Weber/meter Ampere-turns

What indicates the shape of a BH curve (Hysteresis loop) of material? Reluctance of the material Field intensity of the substance Magnetic properties of the material Pulling power of the magnetic material

Which electrical quantity is directly proportional to the eddy current? Voltage Current Frequency Resistance

Which is the cause for changing the permeability? Length Flux density Field intensity Magneto motive force

Which type of capacitor is used for space electronics? Plastic film type Ceramic disc type Electrolytic-Aluminum type Electrolytic-Tantalum type

What is the effect of the electrolytic capacitor, if open circuit fault occurs? It will not function It will burst at once It will become leaky It will function normally

What will be the change in value of capacitance if the distance of the plates are decreased in the capacitor? Becomes zero Remains same Decreases Increases

Which property of magnet is illustrated?

Directive property Induction property Saturation property Poles existing property

Which is a paramagnetic substance? Air Steel Glass Water

Which method of magnetization is used to make commercial purpose permanent magnets? Induction method Single touch method Double touch method Divided touch method

What is the effect of inductance if the distance between the turns increases? Increases Decreases Becomes zero Remains same

Which factor is determining the value of capacitance in capacitor? Thickness of the plates Shape of the plates Area of the plates Material of the plates

Which type of capacitors are used in RF coupling circuits? Tantalum Monolithic Electrolytic Metalized polypropylene