It is seen that output of OR gate is Y = A + B.
If both or any one has 1 input then output will be 1.
2
AIPMT 2004
MCQ (Single Correct Answer)
Of the diodes shown in the following diagrams, which one is reverse biased ?
A
B
C
D
Explanation
A diode is said to be reverse biased if
p-type semiconductor of p-n junction is at low
potential with respect to n-type semiconductor of
p-n junction. It is so for circuit (c).
3
AIPMT 2004
MCQ (Single Correct Answer)
In semiconductors at a room temperature
A
the valence band is partially empty and the conduction band is partially filled
B
the valence band is completely filled and the conduction band is partially filled
C
the valence band is completely filled
D
the conduction band is completely empty
Explanation
In semiconductors at room temperature the
electrons get enough energy so that they are able to
over come the forbidden gap. Thus at room
temperature the valence band is partially empty and
conduction band is partially filled. Conduction band
in semiconductor is completely empty only at 0 K.
4
AIPMT 2004
MCQ (Single Correct Answer)
The peak voltage in the output of a half wave diode rectifier fed with a sinusoidal signal without filter is 10 V. The d.c. component of the output voltage is