For small size, high frequency coils, the most common core material is- a. )Air b. )Ferrite c.) Powdered ion d.) Steel
11 21244. If we have a parallel plate capacitor of plate area 'A' and plate separatoin t and having a capacity C and a metallic plate r of area A and of negligible thickness is introduced in the capacitor at a distance from either of the two plates as shown in the given figure then the capacity of the capacitor will become a.) b.) C c.) 2C d.) 4C
3 7432. A superconductor is a a.) A material showing perfect conductivity and Meissner effect below a critical temperature b.) A conductor having zero resistance c.) A perfect conductor with highest di-magnetic susceptibility d.) A perfect conductor which becomes resistance when the current density through it exceeds a critical value
1 6141When an inductor tunes at 200 KHz with 624 pF capacitor and at 600 KHz with 60.4 pF capacitor then the self capacitance of the inductor would be a) 8.05 pF b) 10.05pF c.) 16.01pF d.) 20.01pF
3 10035Sparking occur when a load is switched off because the circuit has high a.) Inductance b.) Capacitance c.) Resistance d.) None
14 41726Sparking between contacts can be reduced by inserting a a.) Resistance in the line b.) Capacitor in series with contacts c.) Capacitor in parallel with contacts d.) None
4 15871RF amplifier of an A.M. receiver is normally biased in a.) Class 'A' b.) Class 'b' c.) Class 'C' d.) None
5 167461.two coupled coils with L1=L2=0.6 H have a coupling coefficient of k=0.8 the turns ratio N1/N2 is......
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