30) In an RC phase shift oscillator, the minimum number of R.C. networks to be connected in cascade will be

31) In a Weinbridge oscillator with R = 5 k Ohm and C = 0.01 micro.F, frequency of oscillation will be

32) The most stable sine wave oscillator is

33) If RF signal is 600 kHz and local oscillator frequency is 1000 kHz, then the output of the mixer will be

34) A astable multivibrator has