Parvathi

Speech signals and the sine wave respectively are the example of

• deterministic signal, random signal.

• both random signals

• both deterministic signals

• random signal, deterministic signals

• a power signal

• an energy signal

• neither an energy signal nor a power signal

• none of the above

A signal is a power signal if it has

• infinite energy

• infinite power

• finite power

• both (A) and (C)

Which of the following statement are true ?

1. Most of the periodic signals are energy signals.

2. Most of the periodic signals are power signals.

3. For energy signals, the power is zero.

4. For power signals, the energy is zero

• 1, 2 and 3 only

• 1 only

• 2 and 3 only

• 1, 2, 3, and 4

The differentiation of a unit step signal is,

• an impulse signal

• an exponential signal

• a ramp signal

• none of these

What is the period of a signal x(t) = 3 sin(4πt) + 7 cos (3πt) ?

• 2 sec

• 4 sec

• 12 sec

• x(t) is not periodic

If a signal f (t) has energy E, the energy of the signal f (2t) is equal to

• 1

• E/2

• 2E

• 4E