Q. On which of the following effect do thermocouples work?

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Q. Which of the following constitutes an active component?

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Q. Which of the following characteristics of a silicon p-n junction diode make it suitable for use as ideal diode?

1. It has low saturation current.
2. It has high value of cut in voltage.
3. It can withstand large reverse voltage.
4. When compared with germanium diode, silicon diode shows a lower degree of temperature dependence under reverse conditions.

Select the answer using the given below

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Q. Assertion (A): Hall effect is used to find the type of semiconductor.

Reason (R): When a specimen of semiconductor carrying current I lies in a magnetic field the force on electrons and holes is in opposite directions.

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Q. When a p-n junction is forward biased. The width of depletion layer decreases.π

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Q. In which of the following case the rating of the transformer to deliver 100 watts of d.c. power to a load, will be least?

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Q. When a p-n Junction is forward biased

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Q. Consider the following statements about conditions that make a metal semiconductor contact rectifying

1. N type semiconductor with work function φs more than work function φM of metal
2. N type semiconductor with work function φs less than work function φM of metal
3. P type semiconductor with work function φs more than work function φM of metal
4. P type semiconductor with work function φs less than work function φM of metal

Of these statements

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Q. Silicon diodes have __________ reverse resistance than germanium diodes.

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Q. The kinetic energy of photoelectrons emitted by a photo sensitive surface depends on

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Q. When reverse bias is applied to a junction diode

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Q. Which of the following statements regarding two transistor model of p-n-n-p device is correct?

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Q. Resistivity of carbon is around

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Q. Which of the following is anti-ferromagnetic material?

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Q. Assertion (A): The capacitance of a reverse biased pin diode is lower than that of reverse biased p-n diode.

Reason (R): A PIN diode has an intrinsic layer between p and n regions.

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Q. In the saturation region of CE output characteristics of n-p-n transistor, VCE is about

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Q. In n channel JFET

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Q. An intrinsic semiconductor (intrinsic electron density = 10¹⁶ m¯³) is deped with donors to a level of 10²² m¯³. What is the hole density assuming all donors to be ionized?

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Q. The capacitor filter provides poor voltage regulation because

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Q. If Vr is the reverse voltage across a graded P-N Junction, then the junction capacitance cj is proportional to

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