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In a Zener regulated power supply, a Zener diode with \(V_Z=6~\text{V}\) is used for regulation. The load current is to be \(4.0~\text{mA}\) and the unregulated input is \(10.0~\text{V}.\) The value of the series resistor \(R_S\) will be: \((\text{Assume }I_Z=5I_L).\)
1. less than \(100~\Omega\)
2. zero
3. infinite
4. \(150~\Omega\)
1. less than \(100~\Omega\)
2. zero
3. infinite
4. \(150~\Omega\)
Subtopic: Â Applications of PN junction |
 53%
Level 3: 35%-60%
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Which one of the following is not true for the photodiodes?
| 1. | The current in the forward bias is more than the current in the reverse bias. |
| 2. | Photodiodes are preferably used in the reverse bias condition for measuring light intensity. |
| 3. | Photodiodes are preferably used in the forward bias condition for measuring light intensity |
| 4. | In photodiodes, only a small portion of the incident photons gets converted to electric current. |
Subtopic: Â Applications of PN junction |
 65%
Level 2: 60%+
Hints
Which material is preferred for solar cells?
1. \(\text{Si}\)
2. \(\text{GaAs}\)
3. \(\text{CdS}\)
4. both \(\text{Si}\) and \(\text{GaAs}\)
Subtopic: Â Applications of PN junction |
 61%
Level 2: 60%+
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- 1(current)
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