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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 3
46.
A transistor has a power rating of 8 W for a case temperature of 25°C. If derating factor is 30 mW/°C, the power rating for 55°C, case temperature is
8 W
7.5 W
7.1 W
6.8 W
Answer: Option
Explanation:

Power rating = 8 - (55 - 25)(30 x 10-3) = 7.1 W.

47.
In figure VBE = 0.7 V. The base current is
above 97 μA
about 97 mA
about 75 μA
about 75 mA
Answer: Option
Explanation:

48.
An ideal power supply has
zero internal resistance
very high internal resistance
high output resistance
both (b) and (c)
Answer: Option
Explanation:

An ideal power supply should have zero voltage drop.

49.
In a self bias circuit for CE amplifier, the emitter resistance is made three times the original value. The collector current will
remain the same
become three times
decrease
become one-third
Answer: Option
Explanation:

The emitter current becomes one-third since collector current in BJT is almost the same as emitter current, collector current also becomes one-third.

50.
A P-channel MOSFET operating in the enhancement mode is characterized by Vt = - 4 V and IDQ = - 10 mA, when VGSQ = - 5.5 V, what will be VGSQ if IDQ = -15 mA and ID, on = - 16 mA
- 2 V
3 V
0.13 V
1.3 V
Answer: Option
Explanation:

.

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