The magnetising current component of the no-load current of an induction motor is much larger than a corresponding transformer because of
For a p-pole machine, the relation between electrical (θe)and mechanical (θm) degrees is given by
The reflection coefficient for the transmission line shown in the figure at P is ________
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Solution
In the circuit shown in the given figure,it is desired to have a constant direct current i(t) through the ideal inductor L. The nature of the voltage source v(t) must be
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Solution
If diameter of a λ⁄2 dipole antenna is increased from λ⁄100 to λ⁄50, then its
The magnitudes of the open-circuit and short-circuit input impedances of atransmission line are 100 Ω and 25 Ω respectively. The characteristic impedance of the line is_______ Ω.
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Solution
\(F=\sqrt{100\times 25}=50\Omega\)
Four alternators, each rated at 5 MVA, 11 kV with 20% reactance are working in parallel. The short circuit level at bus bars is _________
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Solution
6.25 MVA
It an ac chopper is feeding an inductive load, then firing pulse to the SCR
A driving-point impedance function is given by
\(F=\frac{(s+ k_{1})(s+ k_{2})(s+ k_{3})}{(s + 1) (s + 2) (s + 3) (s + 4)}\)The product k1 k2 k3 cannot be more than ________
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Solution
24
Consider the following driving-point functions :
\(F_{1}=\frac{(s^{2}+1)(s^{2}+3)}{s(s^{2}+4)},F_{2}=\frac{(s^{2}+1)(s^{2}+3)}{(s^{2}+2)(s^{2}+4)}\) \(F_{3}=\frac{s(s^{2}+3)}{(s^{2}+2)(s^{2}+4)}\: and\: F_{4}=\frac{(s^{2}+2)(s^{2}+5)}{s(s^{2}+4)}\)Among these, LC functions would include