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Class XII Physics Semiconductor Electronics Quiz 9
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Question 1
The current gain of a common emitter amplifier is 69. If the emitter current is 7.0 mA, collector current is:
Question 2
A transistor is used as an amplifier in common-emitter configuration. If the current at the input terminal is changed by 30 µA, and due to this the base-emitter voltage becomes 0.03 V and the current at the collector gets changed by 3 mA, then the voltage gain of the amplifier is
(Given that load resistance connected to the circuit is 10 k)
(Given that load resistance connected to the circuit is 10 k)
Question 3
In an npn transistor, when the emitter current is changed by 7 mA, the collector current changes by 6.9 mA. The values of and are:
Question 4
In the figure given below, the output characteristic for a common-emitter transistor is shown.
The a.c. current gain for the given transistor, when VCE = 2 V is
The a.c. current gain for the given transistor, when VCE = 2 V is
Question 5
An unknown transistor needs to be identified as a npn or pnp type. A multimeter, with +ve and −ve terminals, is used to measure resistance between different terminals of transistor. If terminal 2 is the base of the transistor then which of the following is correct for a pnp transistor?
Question 6
To get an OR gate from a NAND gate, we need
Question 7
What is the conductivity of a semiconductor sample having electron concentration of 5×1018 m-3, hole concentration of 5×1019 m-3, electron mobility of 2.0 m2 V-1 s-1 and hole mobility of 0.01 m2 V-1 s-1?
(Take charge of electron as 1.6×10-19 C)
(Take charge of electron as 1.6×10-19 C)
Question 8
In an unbiased n-p junction electrons diffuse from n - region to p - region because:
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Mar 4JEE & BITSAT