A Best Way To Crack Gorenment Job Exams

ECE Objective Questions { Diode Circuits }



43. The breakdown voltage for a diac is of the order of
A. 0.3 V
B. 3 V
C. 30 V
D. 300 V

44. On applying reverse bias to a P-N junction diode, it
A. lowers the potential barrier
B. raises the potential barrier
C. greatly increases the minority-carrier current
D. greatly increases the majority-carrier current

45. A full wave rectifier using a capacitor input filter is to supply 100 mA at 300V. (I) The secondary voltage of the transormer must be
A. 200-0-200 V
B. 234-0-234 V
C. 300-0-300 V
D. 420-0-420 V

46. A full wave rectifier using a capacitor input filter is to supply 100 mA at 300V If the capacitor has a value of 16 pF, the percentage ripple will be
A.0.60%
B.1.20%
C.3%
D.6%

47. A bridge rectifier provided with a shunt capacitor is connected to a 10 Id/ load. If the ripple factor is a to be restricted to 0.01, the value of capacitor should be nearly
A.5
B. 10 gF
C. 15 gF
D. 30 gF

48. When ym is the peak value, the average value of the half wave rectified sine wave will be
A. 0.87 ym
B. 0.717 ym
C. 0.5 ym
D. 0.318 ym

49. In the above case the rms value will be
A. 0.87 ym
B. 0.717 ym
C. 0.5 ym
D. 0.318 ym

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