41. In what decade was the first transistor created?
(a) 1930s
(b) 1940s
(c) 1950s
(d) 1960s
42. The lower doping level ________ the conductivity and ________ the resistivity of the material.
(a) increases, decreases
(b) increases, increases
(c) decreases, decreases
(d) decreases, increases
43. Typical values of voltage amplification for the common-base configurations vary from ________ and the current gain is always ________ .
(a) less than 1, 50 to 300
(b) 50 to 300, larger than 1
(c) 50 to 300, less than 1
(d) larger than 1, 50 to 300
44. For practical transistors the level of alpha typically extends from ________ to ________ with most approaching the higher end of the range.
(a) 0.0, 1
(b) 0.90, 0.998
(c) 50, 400
(d) None of the above
45. How much is the base-to-emitter voltage of a transistor in the “on” state?
(a) 0 V
(b) 0.7 V
(c) 0.7 mV
(d) Undefined
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