# 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

4

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

4

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

4

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.

4

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)

4

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)

4

√(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

4

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.

4

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)

4

(2V, 5Ω)

Explanation :
No Explanation available for this question

1.  |K| > 1

2.  K >1

3.  |K| < 1

4.  K < -1

4