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BJT Amplifiers and Oscillators MCQs

Electronics Engineering Objective Questions

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106.  The decibel is a measure of
A. power
B. voltage
C. current
D. power level
Discussion
107. When power output of an amplifier doubles, the increase in its power level is ____decibels.
A. 2
B. 20
C. 3
D. 10
Discussion
108.  When output power level of a radio receiver increases by 3 dB, its absolute power changes by a factor of
A. 2
B. 10
C. 1/2
D. 3
Discussion
109.  Zero watt cannot be chosen as zero decibel level because
A. it is impossible to measure zero watt
B. it is too small
C. every power compared with it would be zero
D. it would be impossible to define a decibel
Discussion
110. A minus 3 dB point on the gain versus frequency curve of an amplifier is that point where
A. signal frequency drops to half the mid-band frequency
B. voltage amplification becomes half of its maximum value
C. power falls to half its maximum value
D. upper cut-off frequency becomes twice the lower cut-off frequency
Discussion
111. The bandwidth of an amplifier may be increased by
A. decreasing the capacitance of its by pass capacitors
B. minimizing its stray capacitances
C. increasing input signal frequency
D. cascading it
Discussion
112.  Lower cut-off frequency of an amplifier is primarily determined by the
A. interval capacitances of the active device used
B. stray capacitance between its wiring and ground
C. ac 12. value of its active devices
D. capacitances of coupling and bypass capacitors.
Discussion

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