A linear delta modulator is designed to operate on speech signals limited to 3.4 kHz. The sampling rate is 10time the Nyquist rate of the speech signal. The step size ∂ is 100 mV. The modulator is tested with a 1 kHz sinusoidal signal. The maximum amplitude of this test signal required to avoid slope overload is

1.  2.04 V

2.  1.08V

3.   4.08V

4.  2.16V

4

1.08V

Explanation :
No Explanation available for this question

The diffusion potential across a p-n junction

1.  Decreases with increasing doping concentration

2.  Increases with decreasing band gap

3.  Does not depend on doping concentration

4.  Increases with increase in doping concentration

4

Increases with increase in doping concentration

Explanation :
No Explanation available for this question

The 6V zener diode shown in the figure, has zero zener resistance and a knee current f 5mA.The minimum value of R so that the voltage across it does not fall below 6V is

1.  1.2k ohms

2.  80ohms

3.  50 ohms

4.  0 ohms

4

50 ohms

Explanation :
No Explanation available for this question

If gate p*polysilicon, then required silicon doping is

1.  8*1011cm-3

2.  8*1013cm-3

3.  8*1015cm-3

4.  Cannot use p* polysilicon gate

4

Cannot use p* polysilicon gate

Explanation :
No Explanation available for this question

If gate is n*polysilicon, then required silicon doping required is

1.  4*1011cm-3

2.  4*1013 cm-3

3.  4*1016cm-3

4.  Cannot use n* polysilicon gate

4

4*1013 cm-3

Explanation :
No Explanation available for this question

If VGS=0V and VDS=0.5V, then current ID is

1.   9.96mA

2.  6.43mA

3.  2.48mA

4.  5.56mA

4

2.48mA

Explanation :
No Explanation available for this question

Value of the threshold voltage VTP is

1.  2.33V

2.  -2.33V

3.  3.29V

4.  -3.29V

4

-2.33V

Explanation :
No Explanation available for this question

Match each of the items A,B and C with and appropriate item from 1,2,3,4 and 5 A: Current gain of a BJT will be increased if B: Current gain of a BJT will be reduced if C. Breakdown voltage of a BJT will be reduced if 1. Collector doping 2. Base width is reduced 3. Emitter doping concentration to base doping concentration ratio is reduced 4. Base doping concentration is increased keeping ratio of the emitter doping concentration to base doping concentration, constant 5. Collector doping concentration is reduced

1.  A-2,B-3,C-1

2.  A-2,B-1,C-3

3.  A-3,B-1,C-2

4.  A-1,B-2,C-3

4

A-2,B-3,C-1

Explanation :
No Explanation available for this question

In a broadcast transmitter, the RF output is represented as xc(t)=100[1+0.9cos5000t+0.3si9000t] `cos(6x106 t The sidebands frequencies are

1.  5.991, 5.995, 6.005, 6.009 MHz

2.  953.5, 954.1, 955.7, 956.4 kHz

3.  5, 9 kHz

4.  795.8, 432.4 Hz

4

953.5, 954.1, 955.7, 956.4 kHz

Explanation :
No Explanation available for this question

1.  4 5 2 1 3

2.  8 4 3 1 2

3.  6 4 3 1 7

4.  1 2 3 4 5

4