An electric motor, developing a starting torque of 15 Nm,starts with a load torque of 7 Nm on its shaft.If the acceleration at start is 2 rad/sec2,the moment of inertia of the systems must be (neglecting viscous and Coulomb/friction).

1.  0.25 kg m2

2.  0.25 Nm2

3.  4 kg m2

4.  4 Nm2

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4
Correct Answer :

4 kg m2


Explanation :
No Explanation available for this question

Consider a phase controlled converter shown in  given Fig.The thyristor is fired at an angle α in every positive half cycle of the input voltage.If the peak value of the instantaneous output voltage equals 230V,the firing angle a is close to

1.  450

2.  1350

3.  900

4.  83.60

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4
Correct Answer :

900


Explanation :
No Explanation available for this question

If at t = 0=,the voltage across the coil is 120V,the value of resistance R is:

1.  0 Ω

2.  20 Ω

3.  40 Ω

4.  60 Ω

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4
Correct Answer :

0 Ω


Explanation :
No Explanation available for this question

For the value of R obtained in (a),the time taken for 95% of the stored energy dissipated is close to

1.  0.10 sec

2.  0.15 sec

3.  0.50 sec

4.  1.0 sec

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4
Correct Answer :

0.50 sec


Explanation :
No Explanation available for this question

The state transition matrix

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

and the state transition equation

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

The induced emf (line-to-line) is close to

1.  5.5 kV

2.  7.2 kV

3.  9.6 kV

4.  12.5 kV

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4
Correct Answer :

7.2 kV


Explanation :
No Explanation available for this question

The power (or torque) angle is close to

1.  13.90

2.  18.30

3.  24.60

4.  33.00

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4
Correct Answer :

24.60


Explanation :
No Explanation available for this question

the positive sequence driving point reactance at the bus is:

1.  2.5 Ω

2.  4.033 Ω

3.  5.5 Ω

4.  12.1 Ω

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4
Correct Answer :

2.5 Ω


Explanation :
No Explanation available for this question

and the zero sequence driving point reactance at the bus is:

1.  2.2 Ω

2.  4.84 Ω

3.  18.18 Ω

4.  22.72 Ω

View Answer  
4
Correct Answer :

2.2 Ω


Explanation :
No Explanation available for this question
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