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General Certificate of Education Ordinary Level COMPILED BY: ABDUL MOIZ CAMBRIDGE INTERNATIONAL EXAMINATIONS
COMPUTER STUDIES 2210/1Logic Gates
Summer 2014 P1 (Q7) ………………………………………………………………………………………………………………………………. 1Specimen 2015 P1 (Q3)...................................................................................................................................2Summer 2013 P11 (Q10).................................................................................................................................3Summer 2013 P12 (Q15).................................................................................................................................4Winter 2012 P12 (Q11)...................................................................................................................................5Winter 2012 P13 (Q15)...................................................................................................................................6Summer 2012 P11 (Q12).................................................................................................................................7Summer 2012 P12 (Q10).................................................................................................................................8Winter 2011 P11 (Q14)...................................................................................................................................9Summer 2011 P11 (Q10)...............................................................................................................................10Specimen 2011 P1 (Q11)...............................................................................................................................11Specimen 2011 P1 (Q12)...............................................................................................................................12
Summer 2014 P1 (Q7)
Q. (a) Draw the logic circuit for the logic statement:
X = 1 if (L is NOT 1 AND F = 1) OR (F is NOT 1 AND A is 1)
Computer-2210 (Bit Pattern) (1) [email protected]
L
F X
A
[5]
(b) Complete the truth table for the above system.
L F A
Working space
X
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
S O L U T I O N:
(a) 1 mark per correct logic gate (accept other gate symbols)
Computer-2210 (Bit Pattern) (2) [email protected]
Specimen 2015 P1 (Q3)An alarm, Y, sends a signal (Y = 1) when certain fault conditions in a chemical process are detected. The inputs are:
The alarm, Y, returns a value of 1 if:either temperature >= 120oC AND stirrer bar is OFFor acidity > 5 AND temperature < 120oC
(a) Draw the logic circuit for the above system using these logic gates.[5]
Computer-2210 (Bit Pattern) (3) [email protected]
L F A X
0 0 0 0
0 0 1 1
0 1 0 1
0 1 1 1
1 0 0 0
1 0 1 1
1 1 0 0
1 1 1 0
Computer-2210 (Bit Pattern) (4) [email protected]
(b) Complete the truth table for this alarm system.[4]
A T S Y1 1 11 1 01 0 11 0 00 1 10 1 00 0 10 0 0
Summer 2013 P11 (Q10)(a) (i) Complete the truth table for the logic circuit which is made up of NAND gates only. [2]
(ii) What single logic gate has the same function as the above logic circuit? [1](b) (i) Complete the truth table for the logic circuit.
(ii) What could replace the whole logic circuit? [1]
Summer 2013 P12 (Q15)(a) Draw the logic circuit represented by the logic statement:X = 1 if (B is NOT 1 AND S is NOT 1) OR (P is NOT 1 AND S is 1)
[6]
Computer-2210 (Bit Pattern) (5) [email protected]
b) Complete the truth table for the above logic statement.[4]
Winter 2012 P12 (Q11)An alarm sounds when certain conditions occur in a nuclear reactor.The output, X, of a logic circuit that drives the alarm must have a value of 1 if:either carbon dioxide pressure too low and temperature < = 300°Cor water pressure > 10 bar and temperature > 300°CThe inputs to the system are:
(a) Draw the required logic circuit using AND, OR and NOT gates only.[5]
(b) Complete the truth table for the above system. [4]P T W X1 1 11 1 01 0 11 0 00 1 10 1 0
Computer-2210 (Bit Pattern) (6) [email protected]
0 0 10 0 0
Winter 2012 P13 (Q15)15 (a) Complete the truth table for the following logic circuit: [4]
A B C X1 1 11 1 01 0 11 0 00 1 10 1 00 0 10 0 0
(b) The above logic circuit uses AND, OR and NOT gates.Name another logic gate and complete its truth table. [3]
Name : _______________________________________________
Summer 2012 P11 (Q12)(a) (i) Complete the truth table for the following logic circuit, which is made up of
NAND gates:
Computer-2210 (Bit Pattern) (7) [email protected]
(ii) What single logic gate has the same function as the above logic circuit?[1]
b) Complete the truth table for the following logic circuit:
A B C X1 1 11 1 01 0 11 0 00 1 10 1 00 0 10 0 0
Summer 2012 P12 (Q10)(a) Complete the truth table for the following logic circuit, which is made up of NAND
gates:
A B C X1 1 11 1 01 0 11 0 00 1 10 1 0
Computer-2210 (Bit Pattern) (8) [email protected]
0 0 10 0 0
(b) Name two other types of logic gates and complete their associated truth tables:
Winter 2011 P11 (Q14)An alarm, X, gives a signal (i.e. X = 1) when a car fuel injection system gives certain fault conditions. The inputs are:
The alarm returns a value of 1 if:Either (i) pressure < 5 bar AND revs > 8000 rpmor (ii) revs <= 8000 rpm AND temp > 120 °C(a) Draw the logic circuit for the above system using these logic gates.
(b) Complete the truth table for this alarm system.
P R T X1 1 11 1 01 0 11 0 00 1 10 1 00 0 1
Computer-2210 (Bit Pattern) (9) [email protected]
0 0 0
Computer-2210 (Bit Pattern) (10) [email protected]
Summer 2011 P11 (Q10)(a) Two logic gates are the AND gate and the OR gate. Complete the truth tables for these two gates:
(b) Complete the truth table for the following logic circuit:
A B C X1 1 11 1 01 0 11 0 00 1 10 1 00 0 10 0 0
Computer-2210 (Bit Pattern) (11) [email protected]
Specimen 2011 P1 (Q11)Draw the truth table for the following logic network: [4]
A B C X1 1 11 1 01 0 11 0 00 1 10 1 00 0 10 0 0
Specimen 2011 P1 (Q12)Draw a logic network and truth table for the following logic problem:
“A sprinkler (S) is ON ifeither temperature alarm (T) is ON and cooler alarm (C) is ONor vent alarm (V) is OFF and cooler alarm (C) is ON” [9]
Working: ____________________________________________________________________
____________________________________________________________________________ [2]
Logic Network:
Truth Table:
T C V S1 1 11 1 01 0 11 0 00 1 10 1 00 0 10 0 0
Computer-2210 (Bit Pattern) (12) [email protected]