A Best Way To Crack Gorenment Job Exams

ECE Objective Questions { FET and FET Amplifiers }



113. A certain JFET data sheet gives VGS(off) =-4 V. The pinch-off voltage VP is
A. +4 V
B. -4 V
C. dependent on VGs
D. data insufficient

114. The constant-current region of a JFET lies between
A. cut off and saturation
B. cut off and pinch-off
C. 0 and iGss
D. pinch-off and breakdown

115. At cut-off, the JFET channel is
A. at its widest point
B. completely closed by the depletion region
C. extremely narrow
D. reverse biased

116.  If a = 0.995, 1 E = 10 mA and Ito = 0.5 ma, then IcED will be
A. 100 RA
B. 25 IAA
C. 10.1 RA
D. 10.5 pA

117.  If the input ac is 10 Vrms, the maximum voltage that will appear across the diode of a half-wave rectifier with a capacitor input filter will be
A. 10 V
B. 14 V
C. 20 V
D. 28 V

118. Given for an FET, gm = 9.5 mA/volt, total capacitance = 500 pF. For a voltage gain of-30, the bandwidth will
A. 100 kHz
B. 630 kHz
C. 3 MHz
D. 19 MHz

119. The parameters of an, FET are gm = 3mA/V, rd = 312 R1 = 3k as a source follower load. The input impedance is give by
A. 333 Si
B. 3 1(0
C. 2.71a1
D.300

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