Exercise: Networks Analysis And Synthesis

Questions for: Networks Analysis And Synthesis

Assertion (A): In an R-L circuit having low resistance, current lags the voltage by nearly 90°.

Reason (R): Power factor of a series RL circuit is R/Z.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true and R is not the correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: A
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For the given circuit, the current I is
A:
2 A
B:
5 A
C:
7 A
D:
8 A
Answer: C
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A battery charger can drive a current of 5A with 1Ω resistance connected at its output. If it can charge 2 V battery at 7 A rate, its Thevenin's equivalent circuit will be
A:
7.5 in series with 0.5 Ω resistance
B:
1.25 V in series with 1.5 Ω resistance
C:
7.5 V in parallel with 0.5 Ω resistance
D:
12.5 V in parallel with 1.5 Ω resistance
Answer: A
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Current through a charging capacitor exhibits
A:
an exponential growth function
B:
an exponential decay function
C:
a step decay function
D:
a linear decay function
Answer: C
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In a varistor, as the voltage increases beyond a certain value, its resistance
A:
rapidly increases
B:
rapidly decreases
C:
becomes negative, i.e., varistor goes into negative resistance region
D:
none of these
Answer: B
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