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Write one advantage and one disadvantage each for spring control method and gravity control method.
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2 Answers

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A)Spring control method: 

Advantages: 

1) The spring control meters can be used in any position. 

2) In some instruments springs can be used as current leads. 

3) As springs are light in weight, practically there is no increase in weight of the moving system hence high torque to weight ratio. 

4) Controlling torque can be adjusted easily. 

5) Scale is uniform. 


Disadvantages: 

1) Temperature change affects spring length causing change in magnitude of controlling torque. 

2) Accidental stress in the springs may damage them & spring get a permanent set if stressed beyond their elastic limit. 


B)Gravity control method: 

Advantages: 

1) Simple and economical method. 

2) Unaffected by temperature changes. 

3) Not subjected to fatigue. 


Disadvantages: 

1) Instrument has to be kept in vertical position. 

2) Scale is non-uniform. 

3) Control weights add to the weight of instrument.

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Advantages of Spring Control Method:

1) The spring-controlled meters may be used in any position.

2) In some instruments, springs can be used as current leads.

3) As springs are light in weight, practically there is no increase in weight of the

moving system hence high torque to weight ratio.

4) The spring-controlled meters have uniform scale.


Disadvantages of Spring Control Method:

1) Temperature change affects spring length causing change in magnitude of

controlling torque.

2) Accidental stress in the springs may damage them.

3) Spring will not respond if stressed beyond their elastic limit.

4) Controlling torque cannot be adjusted easily.


Advantages of Gravity Control Method:

1) It is very simple method.

2) It is economical method.

3) It is unaffected by temperature changes.

4) It is not subjected to fatigue.

5) Controlling torque can be adjusted easily by control weight.


Disadvantages of Gravity Control Method:

1) Instrument should to kept in vertical position only.

2) Scale is non-uniform.

3) Control weights add to the weight of instrument.

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