A PMMC voltmeter of range (0-300V) with a resistance of 10 ohms gives has a coil of effective depth of 3 mm and a width of 2.5 cm, the coil has about 100 turns. The flux spread in the air gap is of 10mWbm. Calculate, i. Control torque produced by the coil, when it is connected to 50V to measure. ii. Spring constant, when the pointer makes 30o deflection for the measurement of 120V then the total deflecting torque is 7.5x10-3. iii. Explain how the pointer moves in a Dynamo type wattmeter with relevant sketch, and also mention the consequence of removing the resistance connected in series with the voltage coil.
A PMMC voltmeter of range (0-300V) with a resistance of 10 ohms gives has a coil of effective depth of 3 mm and a width of 2.5 cm, the coil has about 100 turns. The flux spread in the air gap is of 10mWbm. Calculate, i. Control torque produced by the coil, when it is connected to 50V to measure. ii. Spring constant, when the pointer makes 30o deflection for the measurement of 120V then the total deflecting torque is 7.5x10-3. iii. Explain how the pointer moves in a Dynamo type wattmeter with relevant sketch, and also mention the consequence of removing the resistance connected in series with the voltage coil.
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A PMMC voltmeter of range (0-300V) with a resistance of 10 ohms gives has a coil of effective depth of 3 mm and a width of 2.5 cm, the coil has about 100 turns. The flux spread in the air gap is of 10mWbm. Calculate,
i. Control torque produced by the coil, when it is connected to 50V to measure.
ii. Spring constant, when the pointer makes 30o deflection for the measurement of
120V then the total deflecting torque is 7.5x10-3.
iii. Explain how the pointer moves in a Dynamo type wattmeter with relevant
sketch, and also mention the consequence of removing the resistance connected in series with the voltage coil.
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