if the 3-phase balanced source in Figure 2.2 delivers 1500 W at a leading power factor of 0.844, then the value of ZL (in ohm) is approximately

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

The Laplace transform of a continuous-time signal x(t) is X(s)=5-S/s2-s-2  If the Fourier transform of this signal exists, then x(t) is

1.  e 2t u(t)-2 e –t u(t)

2.  –e 2t u(-t)+ 2 e –t  u(t)

3.  –e  2t  u(-t)-2e –t u(t)

4.  e 2t u(-t)-2 e –t u(t)

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4
Correct Answer :

e 2t u(t)-2 e –t u(t)


Explanation :
No Explanation available for this question

If the impulse response  of  a  discrete-time  system  is h[n]=-5n u[-n-1] then the system function H(Z) is equal to

1.  -z/z-5  and the system is stable

2.  z/z-5 and the system is stable

3.  –z/z-5 and  the system is unstable

4.  z/z-5 and the system is unstable

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4
Correct Answer :

z/z-5 and the system is unstable


Explanation :
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An amplifier using an opamp with a slew-rate SR = 1V/µsec has a gain of 40 dB. If  this  amplifier  has  to  faithfully  amplify  sinusoidal  signals  from  dc  to  20  KHz without  introducing any  slew-rate  induced distortion,  then  the  input  signal  level must not exceed

1.  795 mV

2.  395 mV

3.  79.5 mV

4.  39.5 mV

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4
Correct Answer :

39.5 mV


Explanation :
No Explanation available for this question

The  circuit  in Figure 2.6 employs positive  feedback and  is  intended  to generate sinusoidal  oscillation.  If  at  a  frequency f 0B(f)=ΔVf(f)/V0(f)=1/6  , then to sustain oscillation at this frequency

1.  R2=5R1

2.  R2=6R1

3.  R2=R1/6

4.  R2=R1/5

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4
Correct Answer :

R2=R1/6


Explanation :
No Explanation available for this question

A zener diode regulator in Figure 2.7 is to be designed to meet the specifications: IL = 10 mA, V0 = 10 V and Vin varies from 30 V to 50 V. The zener diode has Vz=10V and  Izk  (knee current) = 1 mA. For satisfactory  operation

1.  R ≤ 1800

2.  2000? ≤ R ≤ 2200?

3.  3700?≤R≤4000?

4.  R>4000?

View Answer  
4
Correct Answer :

2000? ≤ R ≤ 2200?


Explanation :
No Explanation available for this question

The voltage gain AΔ=V0/Vi of the JFET amplifier shown in figure  2.8 is

1.  +18

2.  -18

3.  +6

4.   -6

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4
Correct Answer :

-6


Explanation :
No Explanation available for this question

The z-parameters Z11 and Z12 for the 2-port network in the figure,

1.  Z11= -6Ω/11;Z21= α 16Ω/11

2.  Z11= 6Ω/11;Z21= 4Ω/11

3.  Z11= -6Ω/11;Z21= -16Ω/11

4.  Z11= 4Ω/11;Z21= 4Ω/11

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4
Correct Answer :

Z11= -6Ω/11;Z21= -16Ω/11


Explanation :
No Explanation available for this question

The  gates G1  and G2  in  Figure  2.9  have  propagation  delays  of 10  nsec  and 20 nsec  respectively.  If  the  input  Vi makes  an  abrupt  change  from  logic  0  to  1  at time t = t0 then the output waveform V0 is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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An npn BJT has gm = 38m A/V,Cμ=10-14F,Cπ=4x10-13F,and DC current gain βn=90.For this transistor fT and fβ  are

1.  fT = 1.64x108 Hz and fβ =1.47x1010 Hz

2.  fT = 1. 47x1010 Hz and fβ =1.64x108 Hz

3.  fT = 1.33x1012 Hz and fβ =1.47x1010 Hz

4.  fT = 1.47x1010 Hz and fβ =1.33x1012 Hz

View Answer  
4
Correct Answer :

fT = 1. 47x1010 Hz and fβ =1.64x108 Hz


Explanation :
No Explanation available for this question
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