81. The doping of the sandwiched layer is ________ that of the outer layers.
(a) considerably less than
(b) the same as
(c) considerably more than
(d) None of the above
82. All amplifiers should have at least ________ terminals with ________ terminal(s) controlling the flow between ________ other terminal(s).
(a) 2, 1, 1
(b) 3, 1, 2
(c) 3, 2, 1
(d) 3, 0, 3
83. The common-collector configuration has a ________ input impedance and a ________ output impedance.
(a) low, high
(b) high, low
(c) high, high
(d) low, low
84. The ________ region is the region normally employed for linear (undistorted) amplifiers.
(a) active
(b) cutoff
(c) saturation
(d) All of the above
85. If a value of is specified for a particular transistor configuration it will normally be used for ________ calculations.
(a) ac
(b) dc
(c) ac and dc
(d) None of the above
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BJT » Exercise - 1 1. A BJT has …… PN junction. (a) 1 (b) 2 (c) 3 (d) 4 2. A BJT has : (a) One PN junction (b) Two PN junctions (c) Three PN junctions (d) Four PN junctions 3. The gate of FET is analogous to the …….. of BJT. (a) Emitter (b) Collector (c) Base (d) None of these 4. A BJT is ......... controlled and the FET is ......... controlled device. (a) Current, Current (b) Voltage, Voltage (c) Voltage, Current (d) Current, Voltage 5. BJT with hfe=200, Ib=10 mA and IC= 4 mA is operating in : (a) Active region (b) Cut-off region (c) Saturation region (d) None of these 6. Which of the following statements is/are correct ? I. The DC load line is steeper than AC load line. II. BJT is a voltage controlled device. (a) Statement I (b) Statement II (c) Both statements I & II (d) Either statement I or II 7. In which mode of BJT operation are both junction reverse biased : (a) active (b) saturation (c) cut-off (d) revers active 8. In which mode of BJT operation are both junction forward biased : (a) active (b) saturation (c) cut-off (d) revers active 9. In a bipolar junction transistor the base region is made very thin so that :…- DC Biasing BJTs » Exercise - 1 1. For the BJT to operate in the active (linear) region, the base-emitter junction must be ________-biased and the base-collector junction must be ________-biased. (a) forward, forward (b) forward, reverse (c) reverse, reverse (d) reverse, forward 2. For the BJT to operate in the saturation region, the base-emitter junction must be ________-biased and the base-collector junction must be ________-biased. (a) forward, forward (b) forward, reverse (c) reverse, reverse (d) reverse, forward 3. The cutoff region is defined by IB ________ 0 A. (a) > (b) < (c) (d) 4. Nota 5. Calculate VCE. (a) –4.52 V (b) 4.52 V (c) –9 V (d) 9 V 6. Determine the reading on the meter when VCC = 20 V, RC = 5 k, and IC = 2 mA. (a) 10 V (b) –10 V (c) 0.7 V (d) 20 V 7. Calculate VCE. (a) 4.52 V (b) –4.52 V (c) 4.48 V (d) –4.48 V 8. In a fixed-bias circuit, which one of the stability factors overrides the other factors? (a) S(ICO) (b) S(VBE) (c) S() (d) Undefined 9. In a voltage-divider circuit, which one of the stability factors has the least effect on the device…
- 555555555517. At what region of operation is the base-emitter junction forward biased and the base-collector junction reverse biased? (a) Saturation (b) Linear or active (c) Cutoff (d) None of the above
- 555555555587. One p-n junction of a transistor is ________-biased and the other one is ________-biased in the active region. (a) reverse, reverse (b) forward, forward (c) reverse, forward (d) None of the above
- 555555555586. In the cutoff region the collector-base junction is ________-biased and the base-emitter junction is ________-biased for a transistor. (a) reverse, forward (b) forward, reverse (c) reverse, reverse (d) forward, forward