1
GATE ECE 1987
Fill in the Blanks
+1
-0
Fill in the blanks of the statements below concerning the following Logic Families:
Standard TTL (74XX), Low power TTL(74LXX) Low power schottky TTL(74LSXX), schottky TTL(74 SXXX), Emitter coupled Logic (ECL), CMOS

(a) Among the TTL Families, ________ family requires considerably less power than the standard TTL (74XX) and also has com parable proparation delay.
(b) Only the _______ family can operate over a wide range of power supply voltages.

2
GATE ECE 1987
MCQ (Single Correct Answer)
+1
-0.3
The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X, result in a binary number without overflow. This implies that the result is:
A
negative and is in normal form
B
negative and is in 2's complement form
C
positive and is in normal form
D
positive and is in 2's complement form
3
GATE ECE 1987
MCQ (Single Correct Answer)
+2
-0.6
A transmission line of pure resistive characteristic impedance is terminated with an unknown load. The measured value of VSWR on the line is equal to 2 and a voltage minimum point is found to be at the load. The load impedance is then
A
complex
B
Purely capacitive
C
Purely resistive
D
Purely inductive
4
GATE ECE 1987
MCQ (Single Correct Answer)
+2
-0.6
For an electromagnetic wave incident from one medium to a second medium, total reflection takes place when
A
The angle of incidence is equal to the Brewster angle with E field perpendicular to the plane of incidence.
B
The angle of incidence is equal to the Brewster angle with E field parallel to the plane of incidence.
C
The angle of incidence is equal to the critical angle with the wave moving from the denser medium to a rarer medium.
D
The angle of incidence is equal to the critical angle with the wave moving from a rarer medium to a denser medium.
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