1
GATE ECE 2013
+1
-0.3
A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned ON and also can be turned OFF by any one of the switches irrespective of the state of the other switch. The logic of switching of the bulb resembles.
A
an AND gate
B
an OR gate
C
an XOR gate
D
a NAND gate
2
GATE ECE 2011
+1
-0.3
The output Y in the circuit below is always ‘1’ when
A
two or more of the inputs P, Q, R are ‘0’
B
two or more of the inputs P, Q, R are ‘1
C
any odd number of the inputs P, Q, R is ‘0’
D
any odd number of the inputs P, Q, R is ‘1’
3
GATE ECE 2010
+1
-0.3
Match the logic gates in column A with their equivalents in column B.
A
P-2, Q-4, R-1, S-3
B
P-4, Q-2, R-1, S-3
C
P-2, Q-4, R-3, S-1
D
P-4, Q-2, R-3, S-1
4
GATE ECE 2010
+1
-0.3
For the output F to be 1 in the logic circuit shown, the input combination should be
A
A = 1, B= 1. C = 0
B
A = 1, B= 0,C = 0
C
A = 0, B= 1. C = 0
D
A = 0, B= 0, C = 1
EXAM MAP
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