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Total Questions : 2104 | Page 7 of 211 pages
Question 61.

The unit of permeability is



  1.    T
  2.    Wb
  3.    H/M
  4.    H
 Discuss Question
Answer: Option C. -> H/M


Question 62.

In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will


  1.    be reduced by half
  2.    be doubled
  3.    be four times as high
  4.    be reduced to one fourth
 Discuss Question
Answer: Option A. -> be reduced by half


Question 63.

Two coupled
coils lie in parallel planes such that 50% of magnetic flux produced by
one links the other. The coefficient of coupling is


  1.    0.5
  2.    0.25
  3.    0.125
  4.    `sqrt(0.5)`
 Discuss Question
Answer: Option A. -> 0.5


Question 64.


Assertion (A): A band elimination filter attenuates signals whose frequencies lie between the cutoff frequencies.

Reason (R): A band elimination circuit is very different from band pass circuit.



  1.    Both A and R are true and R is correct explanation of A
  2.    Both A and R are true and R is not the correct explanation of A
  3.    A is true but R is false
  4.    A is false but R is true
 Discuss Question
Answer: Option B. -> Both A and R are true and R is not the correct explanation of A


Question 65.

The flux linkage `psi`, self inductance L and current i are related as


  1.    ψ = L/i
  2.    ψ = Li
  3.    ψ = Li2
  4.    ψ = `1/2` Li2
 Discuss Question
Answer: Option C. -> ψ = Li2


Question 66.

The series element in band pass filter is


  1.    capacitive
  2.    inductive
  3.    parallel combination of inductance and capacitance
  4.    series combination of inductance and capacitance
 Discuss Question
Answer: Option D. -> series combination of inductance and capacitance


Question 67.

A
sinusoidal current having peak value of 7.07 A is superimposed on dc of
5A. If a hot-wire ammeter is used to measure the combined current in
the circuit, it will indicate __________ ampere.



  1.    7.07
  2.    10
  3.    12.07
  4.    2.07
 Discuss Question
Answer: Option A. -> 7.07


Question 68.

An ideal current source has


  1.    infinite source resistance
  2.    zero source resistance
  3.    large value of source resistance
  4.    finite value of source resistance
 Discuss Question
Answer: Option A. -> infinite source resistance


Question 69.

For a reactance function H(s)



  1.    Re [H(jω)] is positive for ω ≤ 0
  2.    Re [H(jω)] is zero for ω ≤ 0
  3.    Re [H(jω)] is positive or zero for ω ≤ 0
  4.    Re [H(jω)] is zero or negative for ω ≤ 0
 Discuss Question
Answer: Option B. -> Re [H(jω)] is zero for ω ≤ 0


Question 70.

Two
coils having equal resistance but different inductances are connected
in series. The time constant of the series combination is



  1.    average of the time constants of individual coils
  2.    sum of the time constants of the individual coils
  3.    geometric mean of the time constants of individual coils
  4.    product of the time constants of the individual coils
 Discuss Question
Answer: Option A. -> average of the time constants of individual coils


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