Electronics and Communication Engineering - Analog Electronics

46. 

If the thermal resistance of a transistor is lower it means

A. higher junction temperature
B. lower junction temperature
C. higher or lower junction temperature depending on circuit conditions
D. higher or lower junction temperature depending on transistor

Answer: Option B

Explanation:

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47. 

A Darlington pair has β = 300. If RE = 1 kΩ and RL = 100 Ω, the input impedance at the base is approximately

A. 300 k ohm
B. 3 k ohm
C. 100 k ohm
D. 30 k ohm

Answer: Option B

Explanation:

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48. 

Barkhausen criterion is 1 + Avβ = 0.

A. True
B. False

Answer: Option A

Explanation:

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49. 

The voltage gain of which transistor configuration is less than unity?

A. CB
B. CE
C. CC
D. None

Answer: Option C

Explanation:

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50. 

Linear transistor circuits always operate in

A. saturation region
B. cut off region
C. active region
D. passive region

Answer: Option C

Explanation:

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