One Stop GATE Forum: I have a doubt..........

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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.

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

Author	Message
Neha Agarwal Groupie Joined: 04Jan2007 Online Status: Offline Posts: 59	Topic: I have a doubt.......... 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. 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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