NEET 2016 Phase 2 | Alternating Current Question 31 | Physics

The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is

0.4

0.5

0.8

1.0

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

Which of the following combinations should be selected for better tuning of an L-C-R circuit used for combination ?

R = 20 $$\Omega $$, L = 1.5 H, C = 35 $$\mu $$F

R = 25 $$\Omega $$, L = 2.5 H, C = 45 $$\mu $$F

R = 15 $$\Omega $$, L = 3.5 H, C = 30 $$\mu $$F

R = 25 $$\Omega $$, L = 1.5 H, C = 45 $$\mu $$F

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

An inductor 20 mH, a capacitor 50 $$\mu F$$ and a resistor 40 $$\Omega $$ are connected in series across a source of emf V = 10 sin 340t. The power loss in A.C. circuit is

0.76 W

0.89 W

0.51 W

0.67 W

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

A small signal voltage V(t) = V₀ sin$$\omega $$t is applied across an ideal capacitor C

Current $$I(t)$$ is in phase with voltage $$V(t)$$.

Current $$I(t)$$ leads voltage V(t) by 180^o

Current $$I(t)$$, legs voltage $$V(t)$$ by 90^o.

Over a full cycle the capacitor C foes not consume any energy from the voltage source.

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