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Electromagnetic Induction Test - 69
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Electromagnetic Induction Test - 69

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  • Question 1/10
    4 / -1
    To core of a transformer is laminated so that
  • Question 2/10
    4 / -1
    In transformer, core is made of soft iron to reduce.
  • Question 3/10
    4 / -1
    A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately
    Solutions

  • Question 4/10
    4 / -1
    In a transformer 220 ac voltage is increased to 2200 volts. If the number of turns in the secondary are 2000, then the number of turns in the primary will be
    Solutions

  • Question 5/10
    4 / -1
    The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an ac supply of 120 V and the current flowing in it is 10 A. The voltage and the current in thesecondary are
    Solutions

  • Question 6/10
    4 / -1
    A transformer is employed to reduce 220 V to 11 V. The primary draws a current of 5 A and the secondary 90 A. The efficiency of the transformer is
    Solutions

  • Question 7/10
    4 / -1
    In a step-up transformer, the turn ratio is 1 : 2. A Leclanche cell (e.m.f. 1.5 V) is connected across the primary. The voltage developed in the secondary wouldbe
  • Question 8/10
    4 / -1
    The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux ϕ linked with the primary coil is given by ϕ = ϕ0 + 4t, where ϕ is in webers, t is time in seconds and ϕ0, is a constant, the output voltage across the secondary coil is
    Solutions

  • Question 9/10
    4 / -1
    A transformer connected to 220 volt line shows an output of 2 A at 11000 volt. The efficiency is 100%. The current drawn from the line is
    Solutions

  • Question 10/10
    4 / -1
    A step-up transformer operates on a 230 V line and supplies a load of 2 ampere. The ratio of the primary and secondary windings is 1 : 25. The current in the primary is
    Solutions

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