Question 71. Two magnetically uncoupled inductive coils have Q factors q1 and q2 at the chosen operating
frequency. Their respective resistances are R1 and R2. When connected in series, the effective
Q factor of the series combination at the same operating frequency is

Question 72. Signals from fifteen thermocouples are multiplexed and each one is sampled once per second with a
16-bit ADC. The digital samples are converted by a parallel to serial converter to generate a serial
PCM signal. This PCM signal is frequency modulated with FSK modulator with 1200 Hz as 1 and
960 Hz as 0. The minimum band allocation required for faithful reproduction of the signal by the
FSK receiver without considering noise is

Question 73. The impulse response of a continuous time system is given by h(t) = δ(t - 1) + δ(t - 3). The value of the step response at t = 2 is