Three analog signals, having bandwidth of 1200 Hz, 600 Hz and 600 Hz are sampled at their respective Nyquist rates, encoded with 12 bit words and time division multiplexed. The bit rate for the multiplexed signal is

The Fourier transform of a real valued time signal has

A. Odd symmetry

B. Even symmetry

C. Conjugate symmetry

D. No symmetry

The RMS value of a rectangular wave of period T, having a value of +V for a duration, T₁(< T) and -V for the duration, T - T₁ = T₂ equals

A. $$V$$

B. $${{{T_1} - {T_2}} \over T}V$$

C. $${V \over {\sqrt 2 }}$$

D. $${{{T_1}} \over {{T_2}}}V$$

A continuous time function x(t) is periodic with period T. The function is sampled uniformly with a sampling period T_s. In which one of the following cases is the sampled signal periodic?

A. $$T = \sqrt 2 {T_s}$$

B. T = 1.2T_s

C. Always

D. Never

The phase response of a passband waveform at the receiver is given by
$$\varphi \left( f \right) = - 2\pi \alpha \left( {f - {f_c}} \right) - 2\alpha \beta {f_c},$$
where f_c is the centre frequency, and α and β are positive constants. The actual signal propagation delay from the transmittance to receiver is

A. $${{\alpha - \beta } \over {\alpha + \beta }}$$

B. $${{\alpha \beta } \over {\alpha + \beta }}$$

C. α

D. β