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I have a doubt..........

Printed From: One Stop GATE
Category: GATE Technical Discussions
Forum Name: GATE ECE
Forum Discription: General Technical Discussions, Queries, doubts etc. for GATE in ECE.
URL: http://forum.onestopgate.com/forum_posts.asp?TID=374
Printed Date: 21Feb2025 at 9:26pm


Topic: I have a doubt..........
Posted By: Neha Agarwal
Subject: I have a doubt..........
Date Posted: 15Feb2007 at 12:50pm



1.Consider the following statements S1 and S2.
S1: The b of a bipolar transistor reduces if the base width is increased.
S2: The b of a bipolar transistor increases if the doping concentration in the base is increased. Which one of the following is correct?

 A. S1 is FALSE and S2 is TRUE
B. Both S1 and S2 are TRUE
C. Both S1 and S2 are FALSE
D. S1 is TRUE and S2 is FALSE
 _________________________

2. In a full-wave rectifier using two ideal diodes, Vdc and Vm are the dc and peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier are

A. Vdc = Vm/p, PIV = 2Vm
B. Vdc = 2 Vm/p, PIV = 2Vm
C. Vdc = 2 Vm/p, PIV = Vm
D. Vdc = Vm/p, PIV = Vm
_________________________

3. Choose the correct one from among the alternatives A, B, C, D after matching an item from Group 1 with the most appropriate item in Group 2.
table1.gif

A. 1-T, 2-P, 3-U, 4-S
B. 1-S, 2-U, 3-P, 4-T
C. 1-S, 2-P, 3-U, 4-Q
D. 1-U, 2-R, 3-S, 4-Q
_________________________

4. Consider an abrupt p-junction. Let Vbi be the built-in potential of this junction and VR be the applied reverse bias. If the junction capacitance (Cj) is 1 pF for
 Vbi + VR = 1V, then for Vbi + VR - 4V, Cj will be

 A. 4 pF
B. 2 pF
C. 0.25 pF
D. 0.5 pF


Answers are :

1-D
2-B
3-C
4-D


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