Exercise: Exam Question Papers

Questions for: Exam Question Papers

Consider the following assertions
SI: For Zener effect at occur, a very abrupt junction is required
S2: For quantum tunnelling to occur, a very narrow energy barrier is required
Which of the following is correct?
A:
Only S2 is true
B:
SI and S2 are both true but S2 is not a reason for SI
C:
SI and S2 are both true and S2 is a reason for SI
D:
Both SI and S2 are false
Answer: A
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The reflection coefficient on a 500 m long transmission line has a phase angle of - 150°. If the operating wavelength is 150 m, what will be the number of voltage maxima on the line?
A:
0
B:
3
C:
6
D:
7
Answer: C
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In an n-type silicon crystal at room temperature, which of the following can have a concentration of 4 x 1019 cm-3?
A:
Silicon atoms
B:
Holes
C:
Dopant atoms
D:
Valence electrons
Answer: C
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It is required to match a 200 Ω load to a 450 Ω transmission line. To reduce the SWR along the line to 1, what must be the characteristic impedance of the quarter-wave transformer used for this purpose, if it is connected directly to the load?
A:
90 kΩ
B:
300 kΩ
C:
D:
Answer: B
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Assertion (A): The line integral of B about a closed contour, in a region containing steady current, is μ0 times the total net current, following through the contour of integration.

Reason (R): The curl of B is equal to μ0 times the current density vector J

A:
Both (A) and (R) are true and (R) is the correct explanation of (A)
B:
Both (A) and (R) are true but (R) is not the correct explanation of (A)
C:
(A) is true but (R) is false
D:
(A) is false but (R) is true
Answer: B
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