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MCQs

Total Questions : 575 | Page 54 of 58 pages
Question 531. 3. The area of hysteresis loss is a measure of
  1.    permittivity
  2.    permeance
  3.    energy loss per cycle
  4.    magnetic flux
 Discuss Question
Answer: Option C. -> energy loss per cycle
Question 532. 9. The 'magnetic field intensity vector of a plane wave is given by
  1.    P x V x13? V2 P
  2.    V2 P+ V (V ? P)
  3.    V2 P+ V xP
  4.    2j
 Discuss Question
Answer: Option C. -> V2 P+ V xP
Question 533. 0. where a y denotes the unit vector is y direction. The wave is propagating with a phase velocity
  1.    5 x 104 m/s.
  2.    ?3 x 108 mA.
  3.    -1.25 x 107 m/s.
  4.    ?3 x 108 m/s.
 Discuss Question
Answer: Option D. -> ?3 x 108 m/s.
Question 534. 1. 55 (V x P) ? ds, where P is a vector, is equal to
  1.    f P ? dl
  2.    f V x V xP?d1
  3.    f V x13?d1
  4.    fff v?P dv
 Discuss Question
Answer: Option A. -> f P ? dl
Question 535. 3. A medium is divided into regions 1 and II about x = 0 plane, as shown in the figure 4.6 below. An electromagnetic wave with electric field E1 = 4? + 3 iy + 5 az is incident normally on the interface from region-I. The electric field E2 in region-II at the interface is
  1.    E2 = El
  2.    4 ax + 0.75 1.25 5z
  3.    3 fix + 3 fiy + 5 iz
  4.    ?3 fix + 3 fiy +5?
 Discuss Question
Answer: Option C. -> 3 fix + 3 fiy + 5 iz
Question 536. 5. A plane wave of wavelength A, is travelling in a direction making an angle 300 with positive x-axis and 90? with positive y-axis. The E field of the plane wave can be represented as (E0 is a constant)j(cut
  1.    E- = Eo e
  2.    E=E0e J(cot ?X ? ?x- Z
  3.    E = Eo e
  4.    Ec, e
 Discuss Question
Answer: Option A. -> E- = Eo e
Question 537. 2. The wave is
  1.    linearly polarized in the z-direction
  2.    elliptically polarized
  3.    left-hand circularly polarized
  4.    right-hand circularly polarized
 Discuss Question
Answer: Option C. -> left-hand circularly polarized
Question 538. 4. When a plane wave travelling in free-space is incident normally on a medium having Cr = 4.0, then fraction of power transmitted into the medium is given by
  1.    92
  2.    15
  3.    3
  4.    6
 Discuss Question
Answer: Option A. -> 92
Question 539. 6. It is given that X1, X2, Xm are M non-zero, orthogonal vectors. The dimension of the vector space spanned by the 2M vector X1, X2, XNV XI,?X2,?Xm is
  1.    2M
  2.    M+1
  3.    M
  4.    dependent on the choice of XI, X2, Xm
 Discuss Question
Answer: Option C. -> M
Question 540. 7. The fl field (in Aim) of a plane wa?c propagating in free space is given by 110 =5,rs cos (wt ? oz) + y ? sin Tlo5(mt --13z-f-Lt2The time average power flow density in Watts isI1
  1.    100
  2.    501102
  3.    50
  4.    107
 Discuss Question
Answer: Option D. -> 107

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