# The size of potential transformers is

1.  the same as that of power trans- formers of the same VA rating

2.  much greater than that of power transformers of the same VA rating because they are designed for low ratio and phase angle errors which require large sized cores and winding conductors

3.  smaller than that of power transformers of the same VA rating

4.  none of these

4

none of these

Explanation :
No Explanation available for this question

# Electronic voltmeter provides more accurate readings in high resistance circuit as compared to a non-electronic voltmeter because of its

1.  high V/ohm ratings

2.  high ohm/V ratings

3.  low meter resistance

4.  high resolution

4

high ohm/V ratings

Explanation :
No Explanation available for this question

# Modern electronic multimeters measure resistance by

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

4

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

Explanation :
No Explanation available for this question

# In digit voltmeter, over-ranging implies that

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

4

1/2 digit is switched on

Explanation :
No Explanation available for this question

# The number of comparators needed in a parallel conversion type 8-bit A to D convertor is

1.  8

2.  16

3.  255

4.  256

4

255

Explanation :
No Explanation available for this question

# In a dual stop integrating type digital voltmeter, the first integration is carried out for 10 periods of the supply frequency of 50 Hz. If the reference voltage used is 2 V, the total conversion time for an input of 1 V is

1.  0.01 sec

2.  0.05 sec

3.  0.1 sec

4.  1 sec

4

0.1 sec

Explanation :
No Explanation available for this question

# In a dual stop integrating type digital voltmeter, the first integration is carried out for 10 periods of the supply frequency of 50 Hz. If the reference voltage used is 2 V, the total conversion time for an input of 1 V is

1.  0.01 sec

2.  0.05 sec

3.  0.1 sec

4.  1 sec

4

0.1 sec

Explanation :
No Explanation available for this question

# 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.  nearly 100 mV

2.  nearly 50 mV

3.  nearly 25 mV

4.  nearly 5.0 mV

4

nearly 5.0 mV

Explanation :
No Explanation available for this question

# 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.  nearly 100 mV

2.  nearly 50 mV

3.  nearly 25 mV

4.  nearly 5.0 mV

4

nearly 5.0 mV

Explanation :
No Explanation available for this question

# A digital voltmeter measures

1.  peak value

2.  peak-to-peak value

3.  rms value

4.  average value

4