Objective questions of alternating current

This assignment (Objective questions of alternating current),provide the important objective questions of the chapter alternating current ,which is important for the students preparing for class-12th board examination or , other competitive examinations (JEE/NEET)

Before to solve this assignment (Objective questions of alternating current), student should solve the assignment of objective questions of electromagnetic induction-

1. A direct current of 5 amp is superimposed on an alternating current I = 10sin ɷt flowing through a wire. The effective value of the resulting current will be:

• (a)(15/2) amp     (b) 5√3 amp  (c) 5√5 amp      (d) 15 amp

2. In an AC circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current is 45°, the value of inductive reactance will be:

• (a)R/4
• (b)R/2
• (c)R
• (d)cannot be found with the given data

3. Resonance frequency of L – C circuit is:

• (a)1/2π √LC       (b) 1/2πLC   (c) 1/2π √L/C   (d) 1/2π √LC

4. In L-C-R series AC circuit, the phase angle between current and voltage is:

• (a)any angle between 0 and ± π/2
• (b)π/2
• (c)π
• (d)any angle between 0 and π

5. In an L-C-R circuit, the capacitance is made one-fourth, when in resonance, so that the circuit remains in resonance?

• (a)4 times    (b) (1/4) times       (c) 8 times        (d) 2 times

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