Revision Form 4

Revision Form 4 – 2014 1. A power station has a safety system based on three inputs to a logic network. A warning signal (S = 1) is produced when certain conditions occur based on these 3 inputs:

A warning signal (S = 1) will be generated if: either (a) Temperature > 120C and Cooling Water < 100 l/hr or (b) Temperature < 120C and (Pressure > 10 bar or Cooling Water <100 l/hr) Draw a logic network and truth table to show all the possible situations when the warning signal could be received. Statement: ____________________________________________________________________

T

P

S

W

Complete the truth table for the above logic network. T 0 0 0 0 1 1 1 1

P 0 0 1 1 0 0 1 1

W 0 1 0 1 0 1 0 1

S

2.

3. Convert the following (a) 97 to Binary _________________________________________________________________________________ _________________________________________________________________________________ (b) 10000111 to decimal _________________________________________________________________________________ _________________________________________________________________________________ (c) AF1 to binary _________________________________________________________________________________ _________________________________________________________________________________ (d) 10001000100 to hexadecimal _________________________________________________________________________________ _________________________________________________________________________________ (e) 7658 to hexadecimal _________________________________________________________________________________ _________________________________________________________________________________ (f) AC5 to decimal _________________________________________________________________________________ _________________________________________________________________________________

4.

5.

6. Fill in the blanks to complete the HTML tags to display the following web page.

<………….> <……………> <…………>This is my web page<…………………..>

…………………………………………………….<……………….>

…………………………………………………….<……………….> 7. Describe the following registers PC: ________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ MAR __________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ MDR __________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ Accumulator ____________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________

8. The following 101 102 103

LDA 107 ADD 108 STO 109

107 108 109

60 20

PC is set to _______________ The value in PC is copied to ________________ The content at memory location ___________ is co