Question

Difference between dynamometer and induction type wattmeter

Answer 1

Answer:

These types of watt-meters operate on the same working principle on which the induction type ammeter and voltmeter operates. These instruments can only be used on ac supply while dynamo-meter type watt meters can be used on either ac or dc supply system. Induction type watt-meters are useful only when the supply and frequency remains constant. Since both the coils i.e. current coil and pressure coils are necessary in such instrument, it is not essential to use shaded pole principle. Because for producing a deflecting torque, two fluxes are essential with suitable phase angle and it would be available from these two coils.

Answer 2

Difference between dynamometer and induction type wattmeter is listed below

Explanation:

Dynamometer type wattmeter

1. The instrument can be used on both DC and AC systems.

2. The instrument can have a high degree of accuracy. If carefully             designed.

3. Power consumption is comparatively low.

4. The weight of the moving system is comparatively low.

5. The instrument has a comparatively weaker working torque.

6. The weight of the moving system is comparatively low.

Induction type wattmeter

1.  The instrument cannot be used on a DC system.

2. The instrument is less accurate. It is accurate only at stated frequency and temperature

3. Power consumption is comparatively higher

4. Weight of the moving system is comparatively higher

5. The instrument has a comparatively more effective working torque.

6. Weight of the moving system is comparatively higher

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