Thermal runaway occurs when_________________?

Related Mcqs:

1. The random motion of holes and free electrons due to thermal agitation is called______________?

   A. Diffusion
   B. Pressure
   C. Ionisation
   D. None of the above

2. When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when_______________?

   A. wheel base of axles is more
   B. degree of curvature is more
   C. both A. and B.
   D. none of the above

3. The point of intersection of d.c. and a.c. load lines represents __________________?

   A. Operating point
   B. Current gain
   C. Voltage gain
   D. None of the above

4. For proper operation of the transistor, its collector should have___________________?

   A. Proper forward bias
   B. Proper reverse bias
   C. Very small size
   D. None of the above

5. For faithful amplification by a transistor circuit, the value of VBE should_____________for a silicon transistor?

   A. Be zero
   B. Be 0.01 V
   C. Not fall below 0.7 V
   D. Be between 0 V and 0.1 V

6. The disadvantage of voltage divider bias is that it has _________________?

   A. High stability factor
   B. Low base current
   C. Many resistors
   D. None of the above

7. The value of stability factor for a base resistor bias is________________?

   A. RB (ß+1)
   B. (ß+1)RC
   C. (ß+1)
   D. 1-ß

8. The stabilisation of operating point in potential divider method is provided by_______________?

   A. RE consideration
   B. RC consideration
   C. VCC consideration
   D. None of the above

9. In voltage divider bias, VCC = 25 V; R1 = 10 kO; R2 = 2.2 V ; RC = 3.6 V and RE =1 kO. What is the emitter voltage?

   A. 7 V
   B. 3 V
   C. V
   D. 8 V

10. In a base resistor method, if the value of ß changes by 50, then collector current will change by a factor ___________________?

    A. 25
    B. 50
    C. 100
    D. 200