The expected answers were:
(a) (i) Voltage gain =
=
= 100
(ii) Current gain =
=
= 10
(iii) Power gain = Voltage gain x Current gain
= 100 x 10
= 1000
(b) (i) Voltage gain in dB = 10 log 100 10
= 20 dB
(ii) Current gain in dB = 10 log 10 = 10 dB
(iii) Power gain in dB = 10 log 1000
= 30 dB
Surprisingly, most of the candidates could not answer this question correctly.
The question was on Amplifiers. The question was attempted by many candidates. The performance was average.