A phase controlled half-controlled single-phase converter is shown in the figure.The control angle α=30o.The output dc voltage wave shape will be as shown in

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

In the circuit shown in the figure the current gain (β) of t he ideal transistor is 10.The operating point of the transistor (Vcc,Ic) is

1.  40V,4A

2.  40V,5A

3.  0V,4A

4.  15V,4A

View Answer  
4
Correct Answer :

0V,4A


Explanation :
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A chopper is employed to charge a battery as shown in figure,The charging current is 5A.The duty ratio is 0.2,The chopper output voltage is also shown in figure.The peak to peak ripple current in the charging current is

1.  0.48 A

2.  1.2 A

3.  2.4 A

4.  1 A

View Answer  
4
Correct Answer :

0.48 A


Explanation :
No Explanation available for this question

An inverter has aperiodic output voltage with the output waveform as shown in figure.When the conduction angle α=120o,the rms fundamental component of the output voltage is

1.  0.78 V

2.  1.10 V

3.  0.90 V

4.  1.27 V

View Answer  
4
Correct Answer :

0.78 V


Explanation :
No Explanation available for this question

An ac induction motor is used for a speed control application.It is driven from an inverter with a constant V/f control.The motor nameplate details are as follows V:415 V  Ph:3  f:50Hz  N:2850 rpm The motor is run with the inverter output frequency set at 40 Hz and with half the rated slip.The running speed of the motor is

1.  2400 rpm

2.  2280 rpm

3.  2340 rpm

4.  2790 rpm

View Answer  
4
Correct Answer :

2340 rpm


Explanation :
No Explanation available for this question

If the transmission bandwidth is doubled in FM, then the SNR is

1.  also doubled

2.  improved four-fold

3.  decreased by one fourth

4.   unaffected

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4
Correct Answer :

decreased by one fourth


Explanation :
No Explanation available for this question

The noise figure of an amplifier is 3 dB. Its noise temperature will be about

1.   145 K

2.  290 K

3.  580 K

4.  870 K

View Answer  
4
Correct Answer :

580 K


Explanation :
No Explanation available for this question

An industrial consumer has a daily load pattern of 2000 KW, 0.8 lag for 12 Hrs and 1000 KW UPF for 12 Hrs. The load factor is       

1.  0.5   

2.  0.75     

3.  0.6   

4.  2.0

View Answer  
4
Correct Answer :

0.6   


Explanation :
No Explanation available for this question

What  is the maximum value of a load which consume 500 KWH per day at a load factor of 0.4, if the consumer increases the load factor of 0.50 without increasing the maximum demand    

1.  52.08KW     

2.   50.8 KW     

3.   4.5 KW     

4.   60 KW

View Answer  
4
Correct Answer :

52.08KW     


Explanation :
No Explanation available for this question

A consumer consumes 600 KWH per day at a load factor of 0.40. If the consumer increases the load factor of 0.70 without increasing the maximum demand, what is the consumption of energy in KWH    

1.  950 KWH         

2.    1000 KWH         

3.  1050KWH      

4.  1100 KWH

View Answer  
4
Correct Answer :

1050KWH      


Explanation :
No Explanation available for this question
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