Electronics and Communication Engineering - Electronic Devices and Circuits
Exercise : Electronic Devices and Circuits - Section 3
- Electronic Devices and Circuits - Section 1
- Electronic Devices and Circuits - Section 2
- Electronic Devices and Circuits - Section 3
- Electronic Devices and Circuits - Section 4
- Electronic Devices and Circuits - Section 5
- Electronic Devices and Circuits - Section 6
- Electronic Devices and Circuits - Section 7
- Electronic Devices and Circuits - Section 8
- Electronic Devices and Circuits - Section 9
- Electronic Devices and Circuits - Section 10
- Electronic Devices and Circuits - Section 11
- Electronic Devices and Circuits - Section 12
- Electronic Devices and Circuits - Section 13
- Electronic Devices and Circuits - Section 14
- Electronic Devices and Circuits - Section 15
- Electronic Devices and Circuits - Section 16
26.
A Varactor diode has
Answer: Option
Explanation:
The applied bias governs the width of depletion layer. Therefore, capacitance varies with bias.
27.
The most important set of specifications of transformer oil includes
Answer: Option
Explanation:
Oil used in transformer work as cooling as well as dielectric strength.
28.
Assertion (A): In Hall effect the O.C. transverse voltage developed by a current carrying semiconductor with a steady magnetic field perpendicular to the current direction has opposite signs for n and p semiconductors.
Reason (R): The magnetic field pushes both holes and electrons in the same direction.
Answer: Option
Explanation:
Holes and electrons move in opposite directions. Therefore R is wrong.
29.
A voltage of 9 V is applied in forward direction to a semiconductor diode in series with a load resistance of 1000 Ω. The voltage across the load resistance is zero. It indicates that
Answer: Option
Explanation:
Since there is no voltage across load resistor, the current is zero and diode is open-circuit. If diode is short- circuited or resistor is open-circuited almost 9 V will appear across resistor.
30.
If the drift velocity of holes under a field gradient of 100 V/m in 5 m/s, their mobility (in SI units) is
Answer: Option
Explanation:
.
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