Distributed winding and short chording employed in AC machines will result in

1.  increase in emf and reduction in harmonics

2.  reduction in emf and increase in harmonics

3.  increase in both emf and harmonics

4.  reduction in both emf and harmonics

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4
Correct Answer :

reduction in both emf and harmonics


Explanation :
No Explanation available for this question

Three single-phase transformers are connected to form a 3-phase transformer bank.The transformers are connected in the following manner.The transformer connection will be represented by

1.  Y d0

2.  Y d1

3.  Y d6

4.  Y d11

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4
Correct Answer :

Y d1


Explanation :
No Explanation available for this question

In a stepper motor,the detent torque means

1.  minimum of the static torque with the phase winding excited  

2.  maximum of the static torque with the phase winding excited,

3.  minimum of the static torque with the phase winding unexcited.

4.  maximum of the static torque with the phase winding unexcited.

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4
Correct Answer :

minimum of the static torque with the phase winding unexcited.


Explanation :
No Explanation available for this question

A two machine power system is shown below. Transmission line XY has positive sequence impedance of Z1 Ω and zero sequence impedance of Z0 Ω.An 'a' phase to ground fault with zero fault impedance occurs at the centre of the transmission line. Bus voltage at X and line current from X to F for the phase 'a', are given by Va Volts and Ia Amperes, respectively. Then, the impedance measured by the ground distance relay located at the terminal X of line XY will be given by

1.  Z1/2 Ω

2.  Z0/2 Ω

3.  (Z0+Z1)/2 Ω

4.  Va/Ia Ω

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4
Correct Answer :

Va/Ia Ω


Explanation :
No Explanation available for this question

An extra high voltage transmission line of length 300 km can be approximated by a lossless line having propagation constant β=0.00127 radians per km. Then the percentage ratio of line length to wavelength will be given by

1.  24.24%

2.  12.12%

3.  19.05%

4.  6.06%

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4
Correct Answer :

6.06\%


Explanation :
No Explanation available for this question

A 3-phase transmission line is shown in the figure,Voltage drop across the transmission line is given by the following equation Shunt capacitance of the line can be neglected.If the line has positive sequence impedance of 15 Ω and zero sequence impedance of 48 Ω,then the values of Zs and Zm will be  

1.  Zs = 31.5 Ω; Zm = 16.5 Ω

2.  Zs = 26 Ω; Zm = 1.1 Ω

3.  Zs = 16.5 Ω; Zm = 31.5 Ω

4.  Zs = 11 Ω; Zm = 26 Ω

View Answer  
4
Correct Answer :

Zs = 26 Ω; Zm = 1.1 Ω


Explanation :
No Explanation available for this question

In the single phase voltage controller circuit shown in the figure,for what range of triggering angle (α)the output voltage (v0) is not controllable

1.  00< α

2.   450 < α < 1350

3.  900 < α < 1800

4.  1350 < α < 1800

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4
Correct Answer :

00< α <450


Explanation :
No Explanation available for this question

A 3-phase Voltage Source Inverter is operated in 1800conduction mode.Which one of the following statements is true

1.  Both pole-voltage and line-voltage will have 3rd harmonic components

2.  Pole-voltage will have 3rd harmonic component but line-voltage will be free from 3rd harmonic

3.  Line-voltage will have 3rd harmonic component but pole-voltage will be free from 3rd harmonic

4.  Both pole-voltage and line-voltage will be free from 3rd harmonic components

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4
Correct Answer :

Pole-voltage will have 3rd harmonic component but line-voltage will be free from 3rd harmonic


Explanation :
No Explanation available for this question

The impulse response of a causal linear time-invariant system is given as h (t).Now consider the following two statements Statement (I) Principle of superposition holds Statement (II) h (t) = 0 for t < 0 Which one of the following statements is correct

1.  Statement (I) is correct and Statement (II) is wrong

2.  Statement (II) is correct and Statement (I) is wrong

3.  Both Statement (I) and Statement (II) are wrong

4.  Both Statement (I) and Statement (II) are correct

View Answer  
4
Correct Answer :

Both Statement (I) and Statement (II) are correct


Explanation :
No Explanation available for this question

It is desired to measure parameters of 230 V/115 v, 2 kVA, single-phase transformer.The following wattmeters are available in a laboratory Wt: 250 V, 10 A, Low Power Factor W2: 250 V, 5 A Low Power Factor W3:150 V, 10 A, High Power Factor W4:150 V, 5 A, High Power Factor The wattmeters used in open circuit teat and short circuit test of the transformer will respectively be

1.  W1 and W2

2.  W2 and W4

3.  W1 and W4

4.  W2 and W3

View Answer  
4
Correct Answer :

W2 and W3


Explanation :
No Explanation available for this question
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