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GATE ECE 2004

MCQ (Single Correct Answer)

-0.3

An ideal Op-Amp is an ideal

voltage controlled current source

voltage controlled voltage source

current controlled current source

current controlled voltage source

GATE ECE 2004

MCQ (Single Correct Answer)

-0.6

The value of 'C' required for a sinusoidal oscillation of frequency 1 KHz in the circuit of the figure is GATE ECE 2004 Analog Circuits - Oscillators Question 2 English

GATE ECE 2004 Analog Circuits - Oscillators Question 2 English

$${1 \over {2\pi }}\mu F$$

$$2\pi \,\mu \,F$$

$${{1 \over {2\pi \sqrt 6 }}^{}}\mu F$$

$$2\pi \,\sqrt 6 \,\mu F$$

GATE ECE 2004

MCQ (Single Correct Answer)

-0.6

A bipolar transistor is operating in the active region with a collector current of 1mA. Assuming that the 'β' of the transistor is 100 and the transconductance (g_m) and the input resistance ($${r_\pi }$$) of the transistor in the common emitter configuration, are

g_m = 25 mA/V and $${r_\pi }$$ = $$15.6\,\,k\Omega $$

g_m = 40 mA/V and $${r_\pi }$$ = $$4.0\,\,k\Omega $$

g_m = 25 mA/V and $${r_\pi }$$ = $$2.5\,\,k\Omega $$

g_m = 40 mA/V and $${r_\pi }$$ = $$2.5\,\,k\Omega $$

GATE ECE 2004

MCQ (Single Correct Answer)

-0.3

In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval t₁ $$ \le $$ t $$ \le $$ t₂. This indicates that during this interval

the input to the modulator is essentially constant.

the modulator is going through slope overload.

the accumulator is in saturation.

the speech signal is being sampled at the Nyquist rate.

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