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ELECTRONIC BITS

1) The bonding forces in compound semiconductors, such as GaAs, arise from 
   a) ionic bonding
   b) metallic bonding
   c) covalent bonding
   d) combination of ionic and covalent bonding

2) In forward biased photo diode, an increase in incident light intensity causes the diode current to 
   a) increase
   b) remain constant
   c) decrease
   d) remain constant while the voltage drop across the diode increases

3) Bridge rectifiers are preferred because 
   a) they require small transformer
   b) they have less peak inverse voltage
   c) they need small transformer and also have less peak inverse voltage
   d) they have low ripple factor

4) The diffusion capacitance of a forward biased p-n junction diode with a steady current I depends on 
   a) width of the depletion region
   b) mean life time of the holes
   c) mean life time of the electrons
   d) junction area

5) A tunnel diode can be used as an 
   a) oscillator
   b) rectifier
   c) invertor
   d) none

6) In a p-n junction , to make the depletion region extent predominantly into p region , the concentration of impurities in the p region must be 
   a) much less than the concentration of impurities in n-region
   b) much higher than the concentration of impurities in n-region
   c) equal to the concentration of impurities in n-region
   d) zero

7) Which of the following is a application of high pass RC circuit
   a) comparator
   b) DC restorer
   c) integrator
   d) differentiator

8) A photodiode works on the principle of 
   a) photo voltaic effect
   b) photo conductive effect
   c) photo electric effect
   d) photo thermal effect

9) Which of the following is a application of clamping circuit
   a) integrator
   b) attenuator
   c) DC restorer
   d) comparator

10) Which of the following is a application of clipping circuit 
   a) differentiator
   b) DC restorer
   c) attenuator
   d) comparator
                                                              

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