1
GATE ECE 2004
MCQ (Single Correct Answer)
+1
-0.3
An ideal Op-Amp is an ideal
A
voltage controlled current source
B
voltage controlled voltage source
C
current controlled current source
D
current controlled voltage source
2
GATE ECE 2004
MCQ (Single Correct Answer)
+2
-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
A
$${1 \over {2\pi }}\mu F$$
B
$$2\pi \,\mu \,F$$
C
$${{1 \over {2\pi \sqrt 6 }}^{}}\mu F$$
D
$$2\pi \,\sqrt 6 \,\mu F$$
3
GATE ECE 2004
MCQ (Single Correct Answer)
+2
-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 (gm) and the input resistance ($${r_\pi }$$) of the transistor in the common emitter configuration, are
A
gm = 25 mA/V and $${r_\pi }$$ = $$15.6\,\,k\Omega $$
B
gm = 40 mA/V and $${r_\pi }$$ = $$4.0\,\,k\Omega $$
C
gm = 25 mA/V and $${r_\pi }$$ = $$2.5\,\,k\Omega $$
D
gm = 40 mA/V and $${r_\pi }$$ = $$2.5\,\,k\Omega $$
4
GATE ECE 2004
MCQ (Single Correct Answer)
+1
-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
A
the input to the modulator is essentially constant.
B
the modulator is going through slope overload.
C
the accumulator is in saturation.
D
the speech signal is being sampled at the Nyquist rate.
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