Related InterviewSolutions

• In relation to a transformer, the relation `(n_p)/(n_s)=10` indicated thatA. the secondary voltage is 10 times the primary voltageB. the primary current is 10 times the secondary voltageC. there are 10 turns in the primary and only one turn in the secondaryD. for every 10 turns in the primary there is only one turns in the secondary
• Which is the wrong relation from the following ? At resonance, in a series L-C-R a.c. circuitA. `omega = 1/(sqrt(LC))`B. `1/(LC)`C. `omega L = 1/(omega C)`D. `f=1/(2 pisqrt(LC))`
• Displacement current is produced due toA. displacement of charge from one point to anotherB. an electric fieldC. a magnetic fieldD. a time varying electric field
• In a series LCR circuit, at resonant frequency.A. the impedance and the current are maximumB. the impedance is maximumC. the current and voltage are maximumD. the current and voltage are minimum
• An acceptor circuit isA. a parallel LC resonant circuitB. a series LCR resonant circuitC. used as a fitter circuitD. used at the output stage of a radiowave transmitter
• For tuning radio and T.V. circuits, series resonance circuits are used asA. rectifier circuitsB. amplifier circuitsC. rejector circuitsD. acceptor circuits
• An inductor stores the energy inA. 1. its electric fieldB. 2. its coilC. 3. its magnetic fieldD. 4. both in electric and magnetic fields
• A bar magnet is kept along the axis is coil with its N-pole facing the coil. The magnet is then rotated along its own axis. The induced current in the coil will weA. clockwiseB. anticlockwiseC. an alternating currentD. zero
• The instantaneous current in an A.C. circuit is given by `I= 2 sin (omega t+theta)` ampere. The r.m.s. value of the current isA. 2 ampereB. `2sqrt(2)` ampereC. `sqrt(2)` ampereD. `1/(sqrt(2))` ampere
• A current `I=100sqrt(2) cos (omega t - phi)` is passed through a D.C. ammeter. The ammeter will readA. `100sqrt(2)`B. `100A`C. `(100)/(sqrt2)A`D. zero