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Energy / Electricity
Electrical Engineer Test Part-5
20 Questions - Developed by:
Zeya
- Developed on:
2019-03-09
- 2,704 taken
Electrical Engineer Test Part-4 (V-1.7) (Question: 81-100)
1
26. Which of the following currents are nearly equal to each other
(d) IB, IC & IE
(a) IB & IC
(b) IE & IC
(c) IB & IE
2
27. For transistor properly biased PnP transistor let IC=10mA and IE=10.2 mA. What is the level of IB?
(c) 200 UA
(b) 200 mA
(a) 0.2 A
(d) 20.2 mA
3
28. Holes flow constitutes the dominant current in a _____transistor.
(b) Pnp
(a) Npn
(c) Npn & pnp
4
29. For operating in the active region the emitter junction should be ___biased and collector
Junction should be ____biased in BJT.
(b) Reverse, reverse
(d) Reverse, forward
(c) Forward, reverse
(a) Forward, forward
5
30. The emitter junction is ___ biased for operating BJT in saturation region.
(b) Reverse
(c) Zero
(a) Forward
6
31. In which region are both the collector base and base emitter junctions forward biased for BJT?
(a) Active
(d) All of the above
(c) Saturation
(b) Cut off
7
32. For the BJT to operate in the saturation region the base emitter junction must be
____ biased and the base collector junction must be ___biased
(c) Reverse, reverse
(d) Reverse, forward.
(a) Forward, forward
(b) Forward, reverse
8
33. At what region of operation is the base emitter junction forward biased and the base collector
Junction reverse biased for BJT.
(d) None of the above
(c) Cut-off
(a) Saturation
(b) Linear or active
9
34. Which of the following configurations can a transistor set up?
(b) Common emitter
(c) Common collector
(d) All of the above
(a) Common base
10
35. Common collector BJT transistor has ________ current gain
(a) high
(b) moderate
(c) Low
11
35. In CB configuration a reverse biased collector junction IC= ____ when the emitter is left open.
(b) IE
(c) ICBO
(a) 0
12
36. ICBO flows from ___ to ____ when emitter is open.
(c) Collector, emitter
(a) Collector, Base
(b) Base, Collector
13
37. The ___ carriers constitute current ICBO
(b) Minority
(a) Both minority and majority
(c) Majority
14
38. ICBO current is __
(c) Less than ICO
(d) Flows when base junction is forward biased.
(b) Increase with temperature
(a) Greater than IC
15
39. with rise in temp ICBO___
(a) Increase linearly
(b) Doubles of every 10 C
(c) Decrease linearly.
16
40. The Alpha DC is always
(b) less than unity
(c) greater than unity
(a) unity
17
41. The α = ____
(d) None of the above.
(b) IC/IE
(c) IC/IB
(a) IB/IE
18
42. Smaller the thickness of the base ____ is the value of αdc
(b) Larger
(a) Smaller
(c) Constant.
19
43. The α is the current gain of ____ configuration
(a) CB
(b) CC
(c) CE
20
44. In CB configuration input resistance is ______
(c) ∆VCB/∆IC
(b) ∆VCB/∆IE
(a) ∆VEB/∆IE
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