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7.
In the transistor amplifier circuit shown in the figure below, the transistor has the following parameters:
βDC = 60, VBE = 0.7V, hie→∞, hfe→∞.
The capacitance Cc can be assumed to be infinite.
In the figure above, the ground has been shown by the symbol ∇.[1] Under the DC conditions, the collector-to-emitter voltage drop is: [2 marks]
(A) 4.8 Volts
(B) 5.3 Volts
(C) 6.0 Volts
(D) 6.6 Volts[2] If βDC is increased by 10%, the collector-to-emitter voltage drop
[2 marks]
(A) increases by less than or equal to 10%
(B) decreases by less than or equal to 10%
(C) increases by more than 10%
(D) decreases by more than 10%
[3] The small-signal gain of the amplifier vc/vs is :[2 marks]
(A) -10
(B) -5.3
(C) 5.3
(D) 10
asked in Electronics and Communication Engineering, 2006
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