1
GATE ECE 2015 Set 3
+1
-0.3
In the circuit shown, diodes $${D_1}$$ ,$${D_2}$$ and $${D_3}$$ are ideal, and the inputs $${E_1}$$ , $${E_2}$$ and $${E_3}$$ are “0 V” for logic ‘0’ and “10 V” for logic ‘1’. What logic gate does the circuit represent?
A
3-input OR gate
B
3-input NOR gate
C
3-input AND gate
D
3-input XOR gate
2
GATE ECE 2014 Set 4
+1
-0.3
In the circuit shown in the figure, if C = 0, the expression for Y is
A
Y= $$A\overline B + \overline A B$$
B
Y=A+B
C
Y= $$\,\overline A \, \overline B$$
D
Y=A B
3
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
4
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’
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