Which external resistor is necessary to cause a 25 msec pulse at ...

[asd123]

Which external resistor is necessary to cause a 25 msec pulse at the output of a 74121 monostable multivibrator when joined with a 10 F external capacitor?
 
  A) 3.6 K resistor B) 20 K resistor C) 4.7 K resistor D) 10 K resistor

Question 2

Determine the contents of the accumulator after the execution of the following:
  MOV A, 3CH; A = 00111100
  MOV R4, 66H; R4 = 01100110
  ANL A, R4; A = AND R4
 
  A) 24H B) 30H C) 27H D) 28H

[triiciiaa]

Answer to Question 1

A

Answer to Question 2

A

[asd123]

TYSM

[mohan]

Thanks for the timely response, appreciate it