8051 Stack Pointer

In 8051 stack pointer is incremented by
(a) 1 if data is pushed on to the stack
(b) 1 if data is popped from the stack
(c) 2 if data is pushed on to the stack
(d) 2 if data is popped from the stack
(AMIE, Microprocessors & Microcontrollers, Summer 2018)


Granular Noise

Granular noise occurs when
(a) Step size is too small
(b) Step size is too large
(c) Three is interference from the adjacent channel
(d) Bandwidth is too large
(AMIE, Communication Engineering, Summer 2018)

Answer:
Granular or Idle noise occurs when the step size is too large compared to small variation in the input signal.  This means that for very small variations in the input signal, the staircase signal is changed by a large amount because of large step size.


Full Adder

A full adder is to be implemented using half adders and OR gates. A 4-bit parallel adder without any initial carry requires (AMIE, Electronic Circuits, Summer 2018)

(a) 8 half adders and 4 OR gates
(b) 8 half adders and 3 OR gates
(c) 7 half adders and 3 OR gates
(d) 7 half adders and 4 OR gates