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Question
A single phase full converter can operate in
Options
A. 4 quadrants
B. 3 quadrants
C. 2 quadrants
D. 1 quadrant
Correct Answer
2 quadrants
More questions
1. In a microwave coaxial cable the inner conductor radius is
a
and inner radius of outside conductor is
b
. For TE
11
mode the cut off wavelength is about
Options
A.
a
+
b
B.
p
(
a
+
b
)
C.
p
a
D.
p
b
Show Answer
Scratch Pad
Discuss
Correct Answer:
p
(
a
+
b
)
2. A 256 x 4 EPROM has
Options
A. 8 address pins and 4 data pins
B. 8 address pins and 8 data pins
C. 4 address pins and 8 data pins
D. 4 address pins and 4 data pins
Show Answer
Scratch Pad
Discuss
Correct Answer: 8 address pins and 4 data pins
Explanation:
2
8
= 256
3. A capacitor stores 0.15C at 5 V. Its capacitance is
Options
A. 0.75 F
B. 0.75 ?F
C. 0.03 F
D. 0.03 ?F
Show Answer
Scratch Pad
Discuss
Correct Answer: 0.03 F
Explanation:
Q = CV or 0.15 = C(5) or C = 0.03 F.
4. Loss angle of a good quality cable is about
Options
A. 1°
B. 30°
C. 70°
D. 90°
Show Answer
Scratch Pad
Discuss
Correct Answer: 1°
Explanation:
For ideal dielectric loss angle is zero. For good quality cables, loss angle is very small, about 1° only.
5. If B, H and M denote flux density, field intensity and magnetisation, B = ?
0
(H + M).
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
6. Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2
a
x
a
Options
A. critical wavelength for TE
10
mode is the same as that for TE
02
mode
B. critical wavelength for TE
10
mode is one half of that for TE
10
mode
C. critical wavelength for TE
10
mode is the same as that for TM
10
mode
D. critical wavelength for TE
10
mode is double that for TE
01
mode
Show Answer
Scratch Pad
Discuss
Correct Answer: critical wavelength for TE
10
mode is the same as that for TM
10
mode
7. Minimum number of 2-input NAND gates required to implement the function F = (
x
+
y
) (Z + W) is
Options
A. 3
B. 4
C. 5
D. 6
Show Answer
Scratch Pad
Discuss
Correct Answer: 4
Explanation:
F
= (
x
+
y
) (z + w) =
xy
.(z + w)
=
xy
z +
xy
w
=
minimum no. of 2 input NAND gate.
8. The first and second subscripts in models of circular waveguides depict
Options
A. the number of full sine wave variations in circumference in direction and Bessel function variations in radial direction respectively
B. the Bessel function variations in radial direction and the number of full sine wave variations in circumference direction respectively
C. the Bessel function variations in circumference direction and number of full sine wave variations in radial direction respectively
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: the number of full sine wave variations in circumference in direction and Bessel function variations in radial direction respectively
9. Which of the following is not a travelling wave?
Options
A.
e
= E
m
sin (?
x
- ?
t
)
B.
e
= E
m
cos (?
x
- ?
t
)
C.
e
= E
m
sin (?
t
- ?
x
)
D.
e
= E
m
sin (?
x
)
Show Answer
Scratch Pad
Discuss
Correct Answer:
e
= E
m
sin (?
x
)
Explanation:
In a travelling wave both
x
and
t
increase simultaneously so that a constant phase point moves in the direction of positive (or negative)
x
.
10. Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be
Options
A. 4 mW
B. 1 mW
C. 7 mW
D. 1/4 mW
Show Answer
Scratch Pad
Discuss
Correct Answer: 4 mW
Explanation:
6 dB = 10 log
10
⟹
= 10
0.6
⟹ 3.98
P
r
= 3.98 mW.
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