Q. In an unloaded transformer, the fluxes limiting the primary and secondary are 30 mWb and 20 mWb. The coefficient of coupling is

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Q. Heat in calories = I²Rt/4.186.

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Q. Poles and zeros of a driving point function of a network are simple and alternate on jω axis. The network consists of

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Q. If A = 3 + j1, A⁴ =

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Q. In a two terminals network the O.C. voltage measured at the given terminals is 100 V and s.c., currents at the same terminals 5 A. If a load of 80 Ω resistance is connected at the terminals, load current is

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Q. Colour code of carbon resistors has only two bands.

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Q. A coil has resistance R and inductance L. At ω = ∞ the phase angle between voltage and current is

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Q. A constant k band pass filter has a pass band from 100 to 400 Hz. The resonant frequency of series and shunt arms is

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Q. Two similar coupled coils are connected in series. The total inductance in series aiding connection is 100 mH. If currents is 3 A, the energy stored in magnetic field is

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Q. A two branch tuned circuit has a coil of resistance R and inductance L in one branch and capacitance C in the second branch. If R is increased, the dynamic resistance

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Q. A 1 μF capacitor is connected to 12 V battery. The energy stored in the capacitor is

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Q. The poles with greater displacement from the real axis correspond to

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Q. In a series RLC circuit p.f is lagging when f < resonance frequency.

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Q. The units for apparent power are watts.

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Q. In a series RLC circuit the phase angle θ of impedance Z ∠θ is positive. The circuit will behave as

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Q. A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10 nF capacitor in the second branch. At resonance frequency is

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Q. A circuit is replaced by its Thevenin's equivalent to find current through a certain branch. If VTH = 10 V and RTH = 20 Ω, the current through the branch

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Q. A capacitor used for power factor correction is single phase circuit decreases

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Q. Evaluate the value of 2 [u (t - 1) - u (1 - 2t)] (u ( t + 1) + u (t)) at t = 3 sec.

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Q. Assertion (A): In an R-L circuit having high inductance, the rise of current is very slow.

Reason (R): The time constant of R-L circuit is L/R.

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