An ideal diode allows current in only one direction A highpa

An ideal diode allows current in only one direction. A highpass filter will block the DC component in the input signal. A digital signal is a discrete-valued signal that can be in either continuous time or discrete time. If h(t) is the impulse response function of a noncausal linear time-invariant system, then it must be true that h(t) isnotequalto 0 for some t

Solution

(a) True. An ideal diode allows current in only one direction. When a diode is forward biased that means the anode is connected with the positive terminal of the battery and the cathode is connected with the negative terminal of the battery then this bias is called forward bias and assists diode to current flow from anode to cathode. forward bias reduces the space charge/ depletion region and assists in current conduction. in reverse biasing the opossite phenomenon happens and space charge region is increased as a results oposses current flow.

(b) True. High pass filter will block the DC component in the input signal. as the gain equation of a first order high pass filter is Vo(jw)/Vin(jw)= jwRC/(1+jwRC) , where w is the angular frequency, R, C is the passive element in the network.

it is quite clear that when w=0 rad/sec or for DC , the gain is 0. that signifies that DC will be attenuated when it passes through the high pass filter.

(c) False. The first criteria of digital signal is signal will be available for a particular values of t(time) not all values of time. so the given expression is false.

(d) Since non-causal system contains future samples. That means in practical cases it is not possible to implement a non-causal system.but we can store the signal in the memory and at a later time they are used by a system then such signals are treated as advanced or future signal. so, impulse respose h(t) not equals to zero for t<0.

(e) true

(f) False, for an induction motor, its shaft speed must be less than its synchronous speed because If the rotor rotated as fast as the stator magnetic field, the rotor conductor bars would appear to be stationary with respect to the rotating field and there would be no voltage induced in the rotor bars. And hence, there will be no cuurent to produce torque.