134. The disadvantage of voltage divider bias is that it has
A. high stability factor
B. low base current
C. many resistors
D. none of the above
135. Thermal runaway occurs when
A. collector is reverse biased
B. transistor is not biased
C. emitter is forward biased
D. junction capacitance is high
136. The purpose of resistance in the emitter circuit of a transistor amplifier is to
A. limit the maximum emitter current
B. provide base-emitter bias
C. limit the change in emitter current
D. none of the above
137. In a transistor amplifier circuit, VCE = VCB +___
A. VBE
B. 2 VBE
C. 1.5 VBE
D. none of the above
138. Thebase resistor method is generally used in
A. amplifier circuits
B. switching circuits
C. rectifier circuits
D. none of the above
139. For germanium transistor amplifier, VCE should for faithful amplification.
A. be zero
B. be 0.2 V
C. not fall below 0.7 V
D. none of the above
140. In a base resistor method, if the value of 13 changes by 50, then collector current will change by a factor of
A.25
B.50
C.100
D.200
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