Determine frequency response of zero order hold and first order hold using actual transfer functions and Pade approximations 
Q1. Difference equation in ______ systems is similar to the _______ equation in continuous systems
Q2. ______ conversion process involves deriving samples of the analog signal at discrete instants of time separated by sampling period T sec.
Q3. ______ conversion process involves reconstructing continuous time signal from the samples given by the digital computer.
Q4. Sampling theorem states that the sampling frequency must be at least______ the _______ frequency present in the signal.
Q5. The transfer function of a linear time-invariant discrete-time system is the ratio of the ______, assuming that the system is initially relaxed.