91. A digital voltmeter measures

1. 1. peak value

   
   
   

   2. peak-to-peak value

   
   
   

   3. rms value

   
   
   

   4. average value

   
   
   

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   NA

   Correct Option: D

   NA

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92. A 10 bit A/D converter is used to digitise an analog signal in the 0 to 5 V range. The maximum peak to ripple voltage that can be allowed in the D.C. supply voltage is

1. 1. nearly 100 mV

   
   
   

   2. nearly 50 mV

   
   
   

   3. nearly 25 mV

   
   
   

   4. nearly 5.0 mV

   
   
   

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   Smallest incremental change =	1	=	1
   	210		1024

   
   

   For 5 V, Incremental change =	5	= nearly 5 mV
   	1024

   Correct Option: D

   Smallest incremental change =	1	=	1
   	210		1024

   
   

   For 5 V, Incremental change =	5	= nearly 5 mV
   	1024

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93. In digit voltmeter, over-ranging implies that

1. 1. next 4 digits are switched on

   
   
   

   2. 1/2 digit is switched off

   
   
   

   3. 1/2 digit is switched on

   
   
   

   4. an indicator short growing

   
   
   

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   NA

   Correct Option: C

   NA

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94. Modern electronic multimeters measur e resistance by

1. 1. using a bridge circuit

   
   
   

   2. using an electronic bridge compensator for nulling

   
   
   

   3. forcing a constant current and measuring the voltage across the unknown resistance

   
   
   

   4. none of these

   
   
   

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   NA

   Correct Option: C

   NA

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95. Electr onic voltmet er pr ovides mor e accurate readings in high resistance circuit as compared to a non-electronic voltmeter because of its

1. 1. high V/ohm ratings

   
   
   

   2. high ohm/V ratings

   
   
   

   3. low meter resistance

   
   
   

   4. high resolution

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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