In a DC machine,which of the following statements is true

1.  Compensating winding is used for neutralizing armature reaction while interpole winding is used for producing residual flux

2.  Compensating winding is used for neutralizing armature reaction while interpole winding is used for improving commutation

3.  Compensating winding is used for improving commutation while interpole winding is used for neutralizing armature reaction

4.  Compensating winding is used for improving commutation while interpole winding is used for producing residual flux

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4
Correct Answer :

Compensating winding is used for neutralizing armature reaction while interpole winding is used for improving commutation


Explanation :
No Explanation available for this question

The concept of an electrically short,medium and long line is primarily based on the

1.  nominal voltage of the line

2.  physical length of the line

3.  wavelength of the line

4.  power transmitted over the line

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4
Correct Answer :

physical length of the line


Explanation :
No Explanation available for this question

Keeping in view the cost and overall effectiveness,the following circuit breaker is best suited for capacitor bank switching

1.  vacuum

2.  air blast

3.  SF6

4.  Oil

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4
Correct Answer :

vacuum


Explanation :
No Explanation available for this question

In a biased differential relay,the bias is defined as a ratio of

1.  number of turns of restraining and operating coil

2.  operating coil current and restraining coil current

3.  fault current and operating coil current

4.  fault current and restraining coil current

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4
Correct Answer :

operating coil current and restraining coil current


Explanation :
No Explanation available for this question

An HVDC link consists of rectifier,inverter transmission line and other equipments.Which one of the following is true for this link

1.  The transmission line produces/ supplies reactive power

2.  The rectifier consumes reactive power and the inverter supplies reactive power from/to the respective connected AC systems

3.  Rectifier supplies reactive power and the inverted consumes reactive power to/from the respective connected AC systems

4.  Both the converters (rectifier and inverter) consume reactive power from the respective connected AC systems

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4
Correct Answer :

The rectifier consumes reactive power and the inverter supplies reactive power from/to the respective connected AC systems


Explanation :
No Explanation available for this question

For a system with the transfer function H(s) = (3(s - 2))/(4s2 - 2s + 1), the matrix A in the state space form x = Ax + Bu is equal to

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

A discrete real allpass system has a pole at z = 2 30°:it,therefore

1.  also has a pole at (1/2) 30°

2.  has a constant phase response over the z- plane: arg |H(z)| = constant

3.  is stable only, if it is anticausal

4.  has a constant phase response over the unit circle: arg |H(ej)| = constant

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4
Correct Answer :

has a constant phase response over the unit circle: arg |H(ej)| = constant


Explanation :
No Explanation available for this question

The time/div and voltage/div axes of an oscilloscope have been erased.A student connects a 1kHz,5 V p-p square wave calibration pulse to channel 1 of the scope and observes the screen to be as shown in the upper trace of the figure.An unknown signal is connected to channel 2 (lower trace) of the scope.If the time/div and V/div on both channels are the same,the amplitude (p-p) and period of the unknown signal are respectively

1.  5 V, 1 ms

2.  5V, 2 ms

3.  7.5 V, 2 ms

4.  10V, 1ms

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4
Correct Answer :

7.5 V, 2 ms


Explanation :
No Explanation available for this question

A sampling wattmeter (that computes power from simultaneously sampled values of voltage and current) is used to measure the average power of a load.The peak to peak voltage of the square wave is 10V and the current is a triangular wave of 5 A p-p as shown in the figure.The period is 20 ms. The reading in W will be

1.  0 W

2.  25 W

3.  50 W

4.  100 W

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4
Correct Answer :

0 W


Explanation :
No Explanation available for this question

What are the states of the three ideal diodes of the circuit shown in figure

1.  D1 ON, D2 OFF, D3 OFF

2.  D1 OFF, D2 ON, D3 OFF

3.  D1 ON, D2 OFF, D3 ON

4.  D1 OFF, D2 ON, D3 ON

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4
Correct Answer :

D1 ON, D2 OFF, D3 OFF


Explanation :
No Explanation available for this question
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