QUESTIONS CARRY TWO MARKS EACH.
Figure below shows the circuit of a gate in the Resistor Transistor Logic (RTL) family.The circuit represents a
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Solution
QUESTIONS CARRY TWO MARKS EACH.
In an unbalanced 3-phase system, currents are measured
as
Ia= zero, Ib= 6∠120° and
Ic= 6 ∠– 120°.
The corresponding sequence components will be
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Solution
QUESTIONS CARRY TWO MARKS EACH.
The insulation resistance of a 20 km long underground cable is 8 mega ohm. Other things being the same, the insulation resistance of a 10 km long cable will be ______
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Solution
QUESTIONS CARRY TWO MARKS EACH.
If the secondary winding of the ideal transformer of the circuit shown in the figure below has 40 turns, then for maximum power transfer to the 2-ohm resistor, the number of turns required in the primary winding will be _____.
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Solution
QUESTIONS CARRY TWO MARKS EACH.
A PMMC voltmeter is connected across a series combination of DC voltage source V1= 2 V and AC voltage source V2(t) = 3 sin(4t) V. The meter reads
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Solution
PMMC instruments reads DC value only so it reads 2V.
QUESTIONS CARRY TWO MARKS EACH.
Are ctifier type ammeter indicates a current reading of 7.07 A when a sinusoidal current i (t) = 10 sin wt is passed through it.A current having a waveform shown in the figure below is passed through the rectifier type instrument
True RMS current in the circuit is _______ A.
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Solution
7.07 A
QUESTIONS CARRY TWO MARKS EACH.
An npn BJT has gm= 38 mA/V, Cμ= 10–4F,Cπ= 4 × 10–13F, and DC current gain β0= 90.For this transistor fT and fb respectively are
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Solution
QUESTIONS CARRY TWO MARKS EACH.
The characteristic polynomial of a system is
q(s) = 2s5+ s4+ 4s3+ 2s2+ 2s + 1.The system is
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Solution
Characteristic equation is
(2s+ 1) (s4+ 2s2+ 1) =0
The roots are s= – 0.5
s= + j, ± j
Since double roots are present on the imaginary axis and one root at negative real axis, therefore system response will be oscillatory.
QUESTIONS CARRY TWO MARKS EACH.
Transfer function of a system is
\(G(s)=\frac{100}{(s+1)(s+100)}\)For a unit-stepinput to the system, approximate settling time for 2% criterion is
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Solution
QUESTIONS CARRY TWO MARKS EACH.
A centre zero ammeter connected in the rotor circuit of a 6-pole 50 Hz induction motor makes 30 oscillations in one minute. The rotor speed is
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Solution