Thermal runaway is not possible in FET because as the temperature of FET increases_________________?

Related Mcqs:

1. A source follower using an FET usually has a voltage gain which is___________?

   A. greater than +100
   B. slightly less than unity but positive
   C. exactly unity but negative
   D. about -10

2. An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/μS.

   A. 10 volts
   B. 5 volts
   C. 5/1 volts
   D. 5/2 volts

3. A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?

   A. 5 Ω & 20 %
   B. 25 Ω & 20 %
   C. 5 Ω & 16.7 %
   D. 25 Ω & 16.7 %

4. An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?

   A. 1/11KΩ
   B. 1/5KΩ
   C. 5KΩ
   D. 11KΩ

5. An ideal OP-AMP is an ideal___________?

   A. Current controlled Current source
   B. Current controlled voltage source
   C. Voltage controlled voltage source
   D. voltage controlled current source

6. In an op-amp differentiator:________________?

   A. the amplitude of output is proportional to rate of change of input
   B. the amplitude of output is proportional to input
   C. output occurs when input is finite and constant
   D. polarity of input and output is the same

7. The effective channel length of a MOSFET in a saturation decreases with increase in___________?

   A. Gate voltage
   B. Drain voltage
   C. Source voltage
   D. Body voltage

8. The most commonly used amplifier in sample & hold circuits is______________?

   A. A unity gain non-inverting amplifier
   B. A unity gain inverting amplifier
   C. An inverting amplifier with a gain of 10
   D. An inverting amplifiers with a gain of 100

9. A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?

   A. 2
   B. 1
   C. 1/2
   D. 0

10. The encapsulation of transistor is necessary for__________?

    A. preventing radio interference
    B. preventing photo-emission effects
    C. avoiding loss of free electrons
    D. mechanical ruggedness