GATE 2011 EC Question Paper

GATE 2011 Electronics and Communication (EC) Engineering 2011 Paper With Explanation

Q.No. 1 – 25 Carry One Mark Each

1. An analog signal is band-limited to 4kHz, sampled at the Nyquist rate and the samples are quantized into 4 levels. The quantized levels are assumed to be independent and equally probable. If we transmit two quantized samples per second, the information rate is ________ bits / second.
(A) 1 (B) 2 (C) 3 (D) 4
Answer: – (D)

2. A system is defined by its impulse response h(n)= 22(n βˆ’ 2) . The system is
(A) stable and causal (B) causal but not stable
(C) stable but not causal (D) unstable and non-causal
Answer: – (B)

3.. Drift current in the semiconductors depends upon
(A) only the electric field
(B) only the carrier concentration gradient
(C) both the electric field and the carrier concentration
(D) both the electric field and the carrier concentration gradient
Answer: – (C)

4. A Zener diode, when used in voltage stabilization circuits, is biased in
(A) reverse bias region below the breakdown voltage
(B) reverse breakdown region
(C) forward bias region
(D) forward bias constant current mode
Answer: – (B)

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