Video Solutions for GATE 2009 EC : Electron Devices - One mark questions

1.  In an n-type silicon crystal at room temperature, which of the following can have a concentration of 4 x 10¹⁹ cm^-3 ?

    

          (A)   Silicon atoms                          (B)  Holes           

           

       (C)  Dopant atoms                           (D) Valence electrons

Ans :

  2.  The full forms of the abbreviations TTL and CMOS in      reference to logic families are

(A)   Triple Transistor Logic and Chip Metal Oxide Semiconductor

  (B)   Tristate Transistor Logic and Chip Metal Oxide Semiconductor

(C)   Transistor Transistor Logic and Complementary Metal Oxide Semiconductor 

  (D) Tristate Transistor Logic and Complementary Metal Oxide Silicon

Ans :

   3.  The ratio of the mobility to the diffusion coefficient in a    
        semiconductor has the units 

          (A)  V^-1                                 (B)   cm.V^-1  
   
         (C)  V.cm^-1                           (D) V.S

    Ans :