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Q: Why is it necessary to insert resistance in series with the motor armature when starting a dc motor?
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Write an algorithm to insert an item to a given location in sorted array?

To insert a number N into array A at index I: // Resize A if necessary If A is too small to add a new element then resize A // Right-shift all elements starting from position I For i = A.length to I A[i] = A[i - 1] // Insert new item A[I] = N


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Why the air gap between stator and armature of electric motor is kept small?

Obviously, if there wasn't a gap, the rotor would not be able to rotate! However, the gap should be as small as possible in order to minimise the reluctance of the magnetic circuit (reluctance is equivalent to resistance), because the reluctance of air is very much larger than for silicon steel.


How long will it take to fully charge a capacitor in a series RC ciRCuit with a 6microfarad capacitor 2Kilohm resistor and 141 volt supply?

The time it takes to fully charge a capacitor depends on the capacitance and resistance of the circuit; the voltage is irrelevant. The equation you need is:t = 5RCwhere: t = time in seconds, R= resistance in ohms, and C =capacitance in farads.So you should now be able to calculate the time for yourself, but remember to convert the resistance into ohms and the capacitance into farads before you insert the figures into the equation.


Why is a starter required for a DC motor?

Large DC motors with field windings instead of permanent magnets present a very heavy load when starting. To prevent fuses blowing, a series of ever smaller resistors are sequentially switched in series with the motor. As the motor picks up speed, a back EMF in opposition to the applied voltage limits the maximum current. When the motor reaches it's running speed the 'starter' is out of circuit.

Related questions

Write an algorithm to insert an item to a given location in sorted array?

To insert a number N into array A at index I: // Resize A if necessary If A is too small to add a new element then resize A // Right-shift all elements starting from position I For i = A.length to I A[i] = A[i - 1] // Insert new item A[I] = N


How do you adjust magneto on 6.5 hp Briggs engine?

The armature needs to be slightly loose with the magnets away from it, insert a business card or index card between flywheel and legs of the armature, slowly rotate the flywheel until magnets pull the legs close, tighten armature rotate flywheel until magnets are away, remove card and you are done.


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