The conduction loss versus device current characteristic of a power MOSFET is best approximated by

1.  a parabola

2.  a straight line

3.  a rectangular hyperbola

4.  an exponentially decaying function

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4
Correct Answer :

a parabola


Explanation :
No Explanation available for this question

A three-phase diode bridge rectifier is fed from a 400V RMS,50 Hz three-phase AC source.If the load is purely resistive,the peak instantaneous output voltage is equal to

1.  400 V

2.  400√2 V

3.  400√(2/3) V

4.  400/√3 V

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4
Correct Answer :

400√2 V


Explanation :
No Explanation available for this question

The output voltage waveform of a three-phase square-wave inverter contains

1.  only even harmonics

2.  both odd and even harmonics

3.  only odd harmonics

4.  only triplen harmonics

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4
Correct Answer :

only odd harmonics


Explanation :
No Explanation available for this question

The RL circuit of Fig given below is fed from a constant magnitude,variable frequency sinusoidal voltage source vIN.At 100 Hz,the R and L elements each have a voltage drop uRMS.If the frequency of the source is changed to 50 Hz,the new voltage drop across R is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

For the three-phase circuit shown in Fig.given below the ratio of the current Ig:Iy:IB is given by

1.  1:1:√3

2.  1:1:2

3.  1:1:0

4.  1:1:√(3/2)

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4
Correct Answer :

1:1:√3


Explanation :
No Explanation available for this question

For the triangular waveform shown in Fig.given below the RMS value of the voltage is equal to

1.  √(1/6)

2.  √(1/3)

3.  1/3

4.  √(2/3)

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4
Correct Answer :

√(1/3)


Explanation :
No Explanation available for this question

The circuit shown in Fig.given below is in steady state,when the switch is closed at t = 0.Assuming that the inductance is ideal,the current through the inductor at t = 0+ equals

1.  0 A

2.  0.5 A

3.  1 A

4.  2 A

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4
Correct Answer :

1 A


Explanation :
No Explanation available for this question

The charge distribution in a metal-dielectric-semiconductor specimen is shown in Fig.given below.The negative charge density decreases linearly in the semiconductor as shown.The electric field distribution is as shown in

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

In Fig.given below the Thevenin's equivalent pair (voltage,impedance)as seen at the terminals P-Q,is given by

1.  (2V, 5Ω)

2.  (2V, 7.5Ω)

3.  (4V, 5Ω)

4.  (4V, 7.5Ω)

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4
Correct Answer :

(2V, 5Ω)


Explanation :
No Explanation available for this question

A unity feedback system having an open loop gain G(s)H(s)=K(1-s)/(1+s) becomes stable when

1.  |K| > 1

2.  K >1

3.  |K| < 1

4.  K < -1

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4
Correct Answer :

|K| < 1


Explanation :
No Explanation available for this question
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