141. For a symmetrical square wave of 800 V peak to peak and for ideal diode, the voltmeter in Fig. will read—
     
     
     
     
     

1. 1. 200 V

   
   
   

   2. 400 V

   
   
   

   3. 800 V

   
   
   

   4. zero

   
   
   

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   NA

   Correct Option: A

   NA

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142. In Fig. V₁ and V₂ are zero centre PMMC voltmeters. When a sinusoidal signal is applied, V₂ reads + 20 V. The reading of the voltmeter V₁ is…… volts.
     
     
     

1. 1. 20 V

   
   
   

   2. – 20 V

   
   
   

   3. 10 V

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: B

   NA

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143. The peak current through the resistor of circuit of Fig. assuming the diodes to be ideal, is—
     
     
     

1. 1. 12 mA

   
   
   

   2. 4 mA

   
   
   

   3. 16 mA

   
   
   

   4. 8 mA

   
   
   

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   NA

   Correct Option: D

   NA

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144. A voltage v = 4 sin ωt is applied to the terminals A and B of the circuit shown in Fig. The diodes are assumed to be ideal. The impedance offered by the circuit across the terminals A and B in kilo-ohms is—
     
     
     

1. 1. 5

   
   
   

   2. 20

   
   
   

   3. 10

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: C

   NA

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145. A single phase full bridge diode rectifier delivers a constant load current of 10 A. Average and rms values of source current are respectively—

1. 1. 5 A, 10 A

   
   
   

   2. 10 A, 10 A

   
   
   

   3. 5 A, 5 A

   
   
   

   4. 0, 10 A

   
   
   

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   NA

   Correct Option: D

   NA

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