# Some wire-wound resistors have bifilar winding. This type of winding is used to

1.  Increase the thermal stability

2.  Reduce the tolerance

3.  Reduce the inductance of winding

4.  Double the power rating of the resistance

5.  280

6.  285

7.  290

8.  295

8

285

Explanation :
No Explanation available for this question

# A metal strain gauge factor of two. Its normal resistance is 120 ohms. If its undergoes a strain of 10-5, the strain is

1.  240 ohms

2.  2 × 105 ohm

3.  2.4 × 10-3 ohm

4.  1.2 × 10-3 ohm

5.  36

6.  37

7.  38

8.  39

8

39

Explanation :
No Explanation available for this question

# A wattmeter  is reading back-wards in an experiment. Upscale reading can be obtained by reversing

1.  Pressure coil connection only

2.  Current coil connection only

3.  Both pressure and current coil connection only

4.  Either pressure or current connection

5.  50

6.  55

7.  60

8.  65

8

60

Explanation :
No Explanation available for this question

# A thermistor exhibits

1.  Only a negative change of resistance with increase in temperature

2.  Only a positive change of resistance with increases in temperature

3.  Can either a negative or positive change of  resistance with increase or positive change of resistance with increase of temperature depending upon the type of material

4.  None of these

5.  35

6.  45

7.  55

8.  65

8

35

Explanation :
No Explanation available for this question

# If the practical units of voltage and current wave each made 20 times as large as they are at present, what would be the consequent alteration in the size of the unit of capacitance

1.  200 times

2.   60 times

3.  20 times

4.       Nil

5.  33.25

6.  32.25

7.  34.25

8.  34.50

8

34.25

Explanation :
No Explanation available for this question

# A thermo-couple ammeter gives full-scale deflection of 10A. when it reads one fifth of the scale the current will be

1.  2A

2.          4A

3.        4.47A

4.            5.78

5.  70

6.  76

7.  78

8.  80

8

76

Explanation :
No Explanation available for this question

# Ratio of the readings of two watt meters connected to measure power in a balanced 3-phase load is 5: 3 and the load is inductive. The power factor at load is

2.     0.917 lag

4.     0.6 lag

5.  54.48

6.  54.68

7.  54.60

8.  54.58

8

54.68

Explanation :
No Explanation available for this question

# Rectifier moving coil instruments respond to

1.  Peak value, irrespective of the nature of the wave form

2.  Average value for all wave forms

3.  Rms value for all wave forms

4.  Rms value for symmetrical square wave form

5.  40

6.  35

7.  45

8.  55

8

40

Explanation :
No Explanation available for this question

# A meter has a full-scale deflection of 900 at a current of 1A. The response of the meter is square law. Assuming spring control, the current for a deflection at 450 will be

1.  0.25 A

2.     0.50 A

3.   0.67 A

4.     0.707 A

4

0.707 A

Explanation :
No Explanation available for this question

# A permanent magnet moving coil type ammeter and a moving iron type ammeter are connected in series in a resistance circuit fed from output of a half wave rectifier voltage source. If the moving iron type instrument reach  5 A, the permanent magnet moving coil type instrument is likely to read

1.  Zero

2.  2.5 A

3.  3.18 A

4.  5 A

4