electrical circuit

ECA

1)When the transistor breakdown occurs?

2)Which modes of transistor give faithful current gain?

3)Which configuration of transistor is called as a buffer?

4)Give two ways to put the transistor is in active region?

5)Give the proper expression for the condition to show the transistor is in saturation region?

6)Give the classification of amplifier based on its configuration?

7)Give the classification of amplifier  based on its output signal?

8)Give the conditions for oscillations?

9)Give the expression for frequency of oscillations in case of Hartely oscillator?

10)Give the expression for frequency of oscillations in case of Wein-bridge oscillator?

11)Give the expression for frequency of oscillations in case of Colpitts oscillator?

12)Give the expression for frequency of oscillations in case of Quartz cystal oscillator?

13)Give the relation between the trasisitor parameters?

14)what is the relation between beta and beta*?

15)what is value of beta in case of CE amplifier?

16)How does the de-sensitivity factor vary in case of negative feedback amplifiers?

17)What is the effect of negative feedback on the gain of the system?

18)What is the effect of negative feedback on distortion in the system?

19)what is the effect of negative feedback on noise in the system?

20)what is the effect of negative feedback on the input and output resistances in case of voltage series   feedback network?

21) what is the effect of negative feedback on the input and output resistances in case of voltage shunt feedback network?  

22)Negative feedback amplifiers are also called as Degenerative networks,suggest your answer?

23)Define de-sensitizing factor in feedback amplifiers?

24)Transistor is defined as transfer of resistance,justify?

25)BJT transistors are good amplifiers than FET’s,suggest your answer?

26)what is the effect of “miller theorem” on input capacitance?

27)Miller effect arises in case of CB configuration of amplifiers, justify? 

28)An amplifier has open loop gain of 1000 and a feed back ratio of 0.04.Ifv the open loop gain changes by 10% due to temperature, find the % change in gain of the amplifier with the feedback?

29)Define sensitivity in the feedback amplifiers?

30)what is the maximum efficiency can be attained in case of class-A power amplifier?

31) what is the maximum efficiency can be attained in case of class-B power amplifiers?

32)To act a particular amplifier as a class-c power amplifier,the point of operation is?

33)If you follow the class-A,class-B,class-AB,class-C in a order,what happens to the efficiency?

34)Define Distortion?

35)What are the causes for Harmonic distortion?

36)What are the causes for Frequency distortion?

37)What are the causes for cause over Distortion?

38)Give suitable equation for Ic in terms of Imax and Imin to reduce the Harmonic distortion to Zero?

39)What is the effect of transformer coupled in power amplifiers on the efficiency?

40)Give the functions of power amplifiers?

41)What is the purpose of Heat sinker?

42)Clipper is also called as Amplitude limitter, justify?

43)What is the purpose of Clamper?

44)Give two applications for both Clippers and Clampers?

45)What is the functioning of Clamper?

46)Give the Mathematical  expression for Clamping circuit theorem?

47)What is the effect of capacitance on the output in the parallel diode clipping circuit?

48)In the break down region of a Clipping circuit the diode behaves as?

49)In a diode clamping circuit with resistor R across the diode the purpose of R is?

50)Define forward recovery time in diode switches?

51)Define reverse recovery time in diode switches?

52)Define turn on time in case of transistor switches?

53)A transistor switch with inductive load functions more like?

54) A Bi-stable Multi has how many stable states?

55)An Astable Multi has how many stable states?

56)A  Mono-stable has how many quasi stable states?

57)Multi vibrators are also called as?

58)Define two types of triggering in case of Multivibrators?

59)Give one example for self activated  Switch?

60)In which region of the diode the diffusion capacitance appears?