1
GATE ECE 1992
MCQ (Single Correct Answer)
+2
-0.6
The 6 V Zener diode shown in figure has zero Zener resistance and a knee current of 5 mA. The minimum value of R, so that the voltage across it does not fall below 6 V is: GATE ECE 1992 Electronic Devices and VLSI - PN Junction Question 16 English
A
1.2 kΩ
B
50 Ω
C
80 Ω
D
0 Ω
2
GATE ECE 1992
Fill in the Blanks
+2
-0
In a transistor having finite B, the forward bias across the base emitter junction is kept constant and the reverse bias across the collector base junction is increased. Neglecting the leakage across the collector base junction and the depletion region generating current, the base current will __________. (increase/decrease/remain constant).
3
GATE ECE 1992
MCQ (Single Correct Answer)
+2
-0.6
An n-channel JFET has a pinch-off voltage VP = -5 V, VDS(max) = 20 V and gm = 2 mA/V. The minimum ‘ON’ resistance is achieved in the JEFT for
A
VGS = - 7 V and VDS = 0 V
B
VGS = 0 V and VDS = 0 V
C
VGS = 0 V and VDS = 20 V
D
VGS = - 7 V and VDS = 20 V
4
GATE ECE 1992
MCQ (More than One Correct Answer)
+1
-0.3
In an 8085 microprocessor system with memory mapped I/O,
A
I/O devices have 16 bit addresses
B
I/O devices are accessed using IN and OUT instructions
C
there can be a maximum of 256 input devices and 256 output devices
D
arithmetic and logic operations can be directly performed with the I/O data.
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