GATE 2009 Electronics and Communication Engg Paper

2. The Fourier series of a real periodic function has only
P. Cosine terms if it is even
Q. Sine terms if it is even
R. Cosine terms if it is odd
S. Sine terms if it is odd
Which of the above statements are correct?
(A) P and S (B) P and R (C) Q and S (D) Q and R

5.In an n-type silicon crystal at room temperature, which of the following can have
a concentration of 4 10 cm ?19−3
(A) Silicon atoms (B) Holes
(C) Dopant atoms (D) Valence electrons

6.The full form of the abbreviations TTL and CMOS in reference to logic families are
(A) Triple Transistor Logic and Chip Metal Oxide Semiconductor
(B) Tristate Transistor Logic and Chip Metal Oxide Semiconductor
(C) Transistor Transistor Logic and Complementary Metal Oxide Semiconductor
(D) Tristate Transistor Logic and Complementary Metal Oxide Silicon

16.In a microprocessor, the service routine for a certain interrupt starts from a fixed location of memory which cannot be externally set, but the interrupt can be delayed or rejected. Such an interrupt is

(A) non-maskable and non-vectored
(C) non-maskable and vectored
(B) maskable and non-vectored
(D) maskable and vectored

55.The amplitude of a random signal is uniformly distributed between -5V and 5V
If the signal to quantization noise ratio required in uniformly quantizing the signal is 43.5dB, the step size of the quantization is approximately

(A) 0.0333V
(B) 0.05V
(C) 0.0667V
(D) 0.10V

56.If the positive values of the signal are uniformly quantized with a step size of 0.05V, and the negative values are uniformly quantized with a step size of 0.1V, the resulting signal to quantization noise ratio is approximately

(A) 46dB
(B) 43.8dB
(C) 42dB
(D) 40dB

60.What are the minimum numbers of NOT gates and 2-input OR gates required to
design the logic of the driver for this 7-segment display?

(A) 3 NOT and 4 OR
(C) 1 NOT and 3 OR
(B) 2 NOT and 4 OR
(D) 2 NOT and 3 OR

Click Here Download ECE 2009 Paper