IEC - PART 1

Which of the following is correct about semiconductors in electronic devices?

• Elemental semiconductors have direct band gap
  

• Compound semiconductors have indirect band gap
  

• Doping is done in Intrinsic semiconductors

• Extrinsic semiconductors are injected with impurities
  

Which of the following constitutes Zener diode?

• Oscillator

• FiIter

• Regulator

• Rectifier

• What rectifier does?

• Converting AC to AC

• Converting DC to AC

• Converting AC to DC

• Converting DC to DC

Which of the following semiconductor is mostly used to construct electronic circuits?

• Si

• Ge

• Sn

• Cu

Power Gain Ap=

What is the range of the radio frequency amplifier?

• 20Hz to 20KHz

• 100KHz to Over 1 GHz

• 1Hz to 100Hz

• 20KHz

How to Calculate the cut-off frequency of an amplifier?

Negative feedback Gain

• A_v/1-BA_v

• A_v/1+BA_v

• A_v/1-BA_p

In Ladder Network Oscillator, R1 & R2 providing ________ and R3 & C1 providing _______

• Emitter stabilizer, base bias potential

• Emitter potential, base bias stabilizer

• base bias potential, Emitter stabilizer

Determine the frequency of oscillator of a three-stage ladder network oscillator in which C=10 nF, R=10 K Ohm

• 647 Hz

• 674 Hz

• 634 Hz