1
GATE ECE 1989
MCQ (More than One Correct Answer)
+1
-0.3
Indicate which of the following logic gates can be used to realize all possible combinational Logic functions:
A
OR gates only.
B
NAND gates only.
C
EX-OR gates only.
D
NOR gates only.
2
GATE ECE 1989
MCQ (More than One Correct Answer)
+1
-0.3
Among the digital IC-families-ECL, TTL and CMOS:
A
ECL has the least propagation delay
B
TTL has the largest fan-out
C
CMOS has the biggest noise margin
D
TTL has the lowest power consumption
3
GATE ECE 1989
MCQ (Single Correct Answer)
+1
-0.3
A logic family has threshold voltage $${V_T}$$= 2V, minimum guaranteed output high voltage $${V_{OH}}$$= 4V, minimum accepted input high voltage $${V_{IH}}$$ = 3V, maximum guaranteed output low voltage $${V_{OL}}$$ = 1V, and maximum accepted input low voltage N $${V_{IL}}$$ =1.5V. Its noise margin is
A
2V
B
1V
C
1.5V
D
0.5V
4
GATE ECE 1989
Subjective
+10
-0
A chemical reactor has three sensors indicating the following conditions:-
(1) Pressure (P) is low or high'
(2) Temperature (T) is low or high' and
(3) Liquid level (L) is low or high.

its has two controls - Heater (H) which is either on or off and inlet value (V) which is open or close. The controls are operated as per Table.

(a) Using the convertion High =1, Low = 0, On=1, Off=0, Open=1 and Closed=0, draw the Karnaugh maps for H and V.

(b) Obtain the minimal product of sums expressions for H and V.

(c) Realize the logic for H and V using two 4-input multiplexers with T and L as control inputs. Used T as MSB. GATE ECE 1989 Digital Circuits - Combinational Circuits Question 4 English

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