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Alternating Current Test - 43
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Alternating Current Test - 43
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  • Question 1/10
    4 / -1
    Assertion When capacitive reactance is smaller than the inductive reactance in LCR circuit, e.m.f. leads the current.
    Reason The phase angle is the angle between the alternating e.m.f. and alternating current of the circuit.
    Solutions

  • Question 2/10
    4 / -1
    Assertion A capacitor of suitable capacitance can be used in an ac circuit in place of the choke coil.
    Reason A capacitor blocks dc and allows ac only.
  • Question 3/10
    4 / -1
    Assertion If the frequency of alternating current in an ac circuit consisting of an inductance coil is increased then current gets decreased.
    Reason The current is inversely proportional to frequency of alternating current.
    Solutions

  • Question 4/10
    4 / -1
    Assertion An inductance and a resistance are connected in series with an ac circuit. In this circuit the current and the potential difference across the resistance lags behind potential difference across the inductance by an angle π/2.
    Reason In LR circuit voltage leads the current by phase angle which depends on the value of inductance and resistance both.
    Solutions

  • Question 5/10
    4 / -1
    Assertion An alternating current does not show any magnetic effect.
    Reason Alternating current varies with time.
  • Question 6/10
    4 / -1
    Assertion The dc and ac both can be measured by a hot wire instrument.
    Reason The hot wire instrument is based on the principle of magnetic effect of current.
  • Question 7/10
    4 / -1
    Assertion ac is more dangerous than dc.
    Reason Frequency of ac is dangerous for human body.
    Solutions

  • Question 8/10
    4 / -1
    Assertion Average value of ac over a complete cycle is always zero.
    Reason Average value of ac is always defined over half cycle.
    Solutions

  • Question 9/10
    4 / -1
    Assertion The divisions are equally marked on the scale of ac ammeter.
    Reason Heat produced is directly proportional to the current.
  • Question 10/10
    4 / -1
    Assertion For an electric lamp connected in series with a variable capacitor and ac source, its brightness increases with increase in capacitance.
    Reason Capacitive reactance decreases with increase in capacitance of capacitor.
    Solutions

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