Electronic Final

A half wave rectifier has a 200 V rms. source and the step-down transfoemer has a turns ratio of 4 : 1 What will be the peak voltage across the load ignoring the drop across the diode?

• 70.7 V

• 40 V

• 100 V

• 50 V

• 141.1 V

If a silicon diode is operating in forward bias in a circuit with 12 V supply and 240 Ohm resistor, then what will be the voltage drop acroaa the diode ?

• 1.5 V

• 6 V

• 12 V

• 0.3 V

• 0.7 V

Which of the following is a trivalent doping element ?

• Arsenic

• Antimony

• Boron

• Phosphorous

• Helium

What will be the power dissipation across a silicon diode carrying a current of 50mA ?

• 25 mW

• 50 mW

• 35 mW

• 100 mW

When a PN junction is forward biased

• Depletion region decreases

• Minority carriers are not affected

• Holes and electrons move away from junction

• All of above

PIV of a diode indicates

• Peak Instantaneous Voltage

• Peak Inverse Voltage

• Peak Inverse Value

• PIV do not apply tto diodes

During forward bias and reverse bias, and ideal diode has .............. respectively.

• Zero conductsance & Zero resistance

• Zero conductsance & Infinite resistance

• Infinite conductsance & Infinite resistance

• Zero conductsance & Infinite resistance

A semiconductor in its purest form is known as ...........

• Super conductor

• Extrinsic semiconductor

• Insulator

• Intrinsic semiconductor

Which of the following substances has a forbidden energy gap of 0.7 eV?

• Carbon

• Silicon

• Germanium

• Copper

The barrier potential for silicon diode at forward bias is

• 0.5 Volt

• 0.3 Volt

• 0.7 Volt

• 1.1 Volt