The circuit shows an ideal diode connected to a pure inductor and is connected to a purely sinusoidal 50Hz voltage source. Under ideal conditions the current waveform through the inductor will look like

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

The Current Source Inverter shown in figure, is operated by alternately turning on thyristor pairs (T1, T2) and (T3, T4). If the load is purely resistive, the theoretical maximum output frequency obtainable will be

1.  125kHz

2.  250kHz

3.  500kHz

4.  50kHz

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4
Correct Answer :

500kHz


Explanation :
No Explanation available for this question

In the chopper circuit shown, the main thyristor (Tm) is operated at a duty ratio of 0.8,which is much larger the commutation interval.If the maximum allowable reapplied dv/dt on TM is 50 V/ps,what should be the theoretical minimum value of C1Assume current ripple through Lo to be negligible.  

1.  0.2 pμF

2.  0.02 pμF

3.  2 pμF

4.  20 pμF

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4
Correct Answer :

0.2 pμF


Explanation :
No Explanation available for this question

Match the switch arrangements on the top row to the steady-state V-I characteristics on the lower row. The steady state operating points are shown by large black dots  

1.  A-II;B-II;C-III;D-IV

2.  A-II;B-IV;C-I;D-III

3.  A-IV;B-III;C-I;D-II

4.  A-IV;B-III;C-II;D-I

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4
Correct Answer :

A-IV;B-III;C-I;D-II


Explanation :
No Explanation available for this question

For the circuit shown,find out the current flowing through the 2Q resistance.Also identify the changes to be made to double the current through the 2Q resistance

1.  (5A; Put Vs = 20V)

2.  (2A; Put Vs = 8V)

3.  (5A; Put is = 10A)

4.  (7A; Put is = 12A)

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4
Correct Answer :

(2A; Put Vs = 8V)


Explanation :
No Explanation available for this question

The figure shows a three-phase delta connected load supplied from a 400V,50 Hz,3-phase balanced source.The pressure coil (PC) and current coil (CC) of a wattmeter are connected to the load as shown,with the coil polarities suitably selected to ensure a positive deflection.The wattmeter reading will be

1.  0

2.   1600 Watt

3.  800 Watt

4.  400 Watt

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4
Correct Answer :

800 Watt


Explanation :
No Explanation available for this question

An average-reading digital multimeter reads 10V when fed with a triangular wave,symmetric about the time-axis.For the same input an rms-reading meter will read.  

1.  20/√3

2.  10/√3

3.  20√3

4.  10√3

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4
Correct Answer :

20/√3


Explanation :
No Explanation available for this question

Figure shows the extended view of a 2 pole dc machine with 10 armature conductors. Normal brush positions are shown by A and B, placed at the interpolar axis.If the brushes are now shifted,in the direction of rotation, to A' and B' as shown,the voltage waveform VAB will resemble    

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

With both S1 and S2 open, the core flux waveform will be

1.  A sinusoid at fundamental frequency

2.  Flat topped with third harmonic

3.  Peaky with third harmonic

4.  None of these

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4
Correct Answer :

Flat topped with third harmonic


Explanation :
No Explanation available for this question

With S2 closed and S1 open, the current waveform in the delta winding will be

1.  a sinusoid at fundamental frequency

2.  flat topped with third harmonic

3.  only third harmonic

4.  none of these

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4
Correct Answer :

only third harmonic


Explanation :
No Explanation available for this question
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