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Question
Assertion (A):
De sauty's bridge is suitable only for pure capacitor.
Reason (R):
Capacitors are mostly perfect.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true
Correct Answer
A is true R is false
Explanation
Capacitors are mostly imperfect.
More questions
1. Consider the following statements (L is the length of array between centres of end antennas and A is wave-length)
Width of major lobe between nulls of broad side array and end fire array are different.
Directive gain of broadside array and end fire array are different.
Directive gain of broadside array is 4
Which of the above statements are correct?
Options
A. 1, 2 and 3
B. 1 and 2 only
C. 1 only
D. 1 and 3 only
Show Answer
Scratch Pad
Discuss
Correct Answer: 1 and 3 only
2. The two terms used to describe performance of a directional coupler are
Options
A. coupling and directivity
B. gain and coupling
C. gain and directivity
D. gain and isolation
Show Answer
Scratch Pad
Discuss
Correct Answer: coupling and directivity
3. In the circuit of figure, the switch is closed at
t
= 0. At
t
= 0
+
the current through C is
Options
A. 4 A
B. 2.5 A
C. 3.1 A
D. 0
Show Answer
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Discuss
Correct Answer: 4 A
Explanation:
Capacitor behaves as a short-circuit at
t
= 0.
4. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.
Options
A. 3 x 10
8
m/sec
B. 5 x 10
8
m/sec
C. 1.5 x 10
8
m/sec
D. 9 x 10
8
m/sec
Show Answer
Scratch Pad
Discuss
Correct Answer: 5 x 10
8
m/sec
Explanation:
V
g
. V
p
= C
2
where
.
5. When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
6. If the number of atoms per unit volume of a monoatomic gas changes, the dielectric constant still remains constant.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
Explanation:
The dielectric constant changes as it is proportional to the number of atoms per unit volume.
7. Nickel is a non-magnetic material.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
Explanation:
Nickel is ferromagnetic material.
8. In a single phase full wave regulator feeding a resistive load, the average current over one full cycle
Options
A. is always zero
B. cannot be zero
C. may be sometimes zero
D. is always positive
Show Answer
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Discuss
Correct Answer: is always zero
9. The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
Explanation:
Hysteresis phenomenon exists below ferromagnetic curie temperature.
10. In a series inverter supplying a load resistance R, the commutating elements L and C should be such that
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
Explanation:
Load should be under damped.
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