1. A demultiplener ____________________
 
 a) has multiple i/p and single o/p
 
 b) has multiple i/p and multiple o/p
 
 c) has multiple i/p and multiple o/p
 
 d) has single i/p and single o/p 

2. A Not gate at the output of AND gate converts AND gate into

a) NAND              b) NOR                  c) AND                      d) NOPE

3. What will be status of z and c y flag after execution of SUB A instruction

a)  z = 0, cy = 0                  b) z = 0, cy = 1                 c)  z = 1, cy = 0                    d) z = 1, cy = 1

4. For the signal g (t) ? 10 cos (50 pt) cos2 (150a)

The Nyquist sampling state in t seconds is ____________

a) 150 samples per second                   

b) 200 samples per second                                                                                     

c) 300 samples per second                                     

d) 350 samples per second

5. Consider the following expressions indicating the step or impulse response of an initially relaxed control system-

1.  (5 ? 4e-2+) u(t)

2.  (e-2t +5) (u(t))

3. V(t) + 8e-2t u(t)

4. V(t) + 4e-2t 4(t)

Those which correspond to the step and impulse response of the same system include-

a) 1&3              b) 1&4                 c) 2&4                    d) 1&4

6. The horizontal axis in a 3 bit unipolar D/A converter represents-

a) Output bit combination          b) analog output voltage            c) input bit combination              d) none of the above

7. Amplifier of class B has high theoretical efficiency of 78.5 percent because-

a) It is biased almost to saturation

b) Its quiescent current is low

c) It's output is an exact replica of it's input

d) It is biased well below cut off