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Why is the field rheostat of a DC motor kept at minimum position while starting?
If you are talking about the field rheostat on a generator, once you have the correct voltage output set, it is very unlikely that it has to be touched again. If it is the generator's first start up, then it is best to set the field on the low side so as not to over excite the generator and drive the output voltage higher that what the generator's specifications are rated at. The field excitation voltage does not have to be set at the minimum position on every start up once it is set for the correct output voltage. A good example of this is a hospital standby generator, it starts up with no human intervention needed.
Why field rheostat of dc shunt motor kept in minimum position?
it is kept at minimum position to produce more torque which is required for starting a motor
How do you select field rheostat range for dc motor?
For a shunt dc motor the rheostat would vary from zero ohms to a value that produces the required minimum field current, but rheostats are not common with shunt motors except as a crude way of controlling the speed. Series dc motors normally use rheostats for starting, especially in trams etc. because the starting torque and current is very high. The rheostat resistance starts at a value equal to the supply voltage divided by the maximum allowable current drawn, and is reduced as the speed builds up.
How much minimum torque is required by a turbine to generate Electricity?
initial torque to overcome the friction in generator and then to keep constant speed of stator within the generator. Minimum 50NM
How do you calculate minimum clock period in a digital circuit?
If you have the Maximum clock frequency, then you can figure out the minimum clock period using this formula: 1/(minimum clock period) = (Maximum clock frequency).
When the rheostat position is changed from minimum position to maximum position in motors what will happens?
the back emf increases so that high currents doesn't pass through the field windings
Why is the field rheostat of a DC motor kept at minimum position while starting?
If you are talking about the field rheostat on a generator, once you have the correct voltage output set, it is very unlikely that it has to be touched again. If it is the generator's first start up, then it is best to set the field on the low side so as not to over excite the generator and drive the output voltage higher that what the generator's specifications are rated at. The field excitation voltage does not have to be set at the minimum position on every start up once it is set for the correct output voltage. A good example of this is a hospital standby generator, it starts up with no human intervention needed.
What happen to voltage and current when rheostat is adjusted from maximum to minimum resistance using both ammeter and voltmeter?
When a rheostat is adjusted from maximum to minimum resistance, the overall resistance in the circuit decreases. As a result, the current flowing through the circuit increases, which can be observed on the ammeter as a higher reading. Conversely, the voltage across the rheostat will decrease, as the voltage drop across a lower resistance is less, which can be monitored using the voltmeter.
How to compute the minimum load of 16 MW generator?
A generator, rated at 16 MW, should be able to continuously supply a load of 16 MW. You don't need to compute its 'minimum load', because the minimum load will be zero watts! In other words, you can run the generator with no load whatsoever if you wish to waste fuel.The point is that the power supplied by a generator is determined by the load, NOT by the generator itself -so it is important that the generator is capable of supplying the maximum load applied to it. A generator's 'rated power output' simply tells us the maximum load it is capable of supplying.
What is the imaginary line halfway between the maximum and minimum points the wave reaches vertically?
The imaginary line halfway between the maximum and minimum points that a wave reaches vertically is called the equilibrium position or the rest position. It represents the average position of the wave when it is not oscillating.
What is a resistor that can be adjusted between minimum and maximum by turning a dial is called a what?
It is a variable resistor. Basically, the same as when you turn up or down the heat on an electrical oven or radio.
What is the the imaginary line halfway between the maximum and and minimum points the wave reaches vertically?
The imaginary line halfway between the maximum and minimum points the wave reaches vertically is known as the equilibrium position or the rest position of the wave. It represents the average position of the wave when it is not experiencing any displacement.
Why field rheostat of dc shunt motor kept in minimum position?
it is kept at minimum position to produce more torque which is required for starting a motor
What are extremes in math terms?
The extrema are the maximum and minimum values.The extrema are the maximum and minimum values.The extrema are the maximum and minimum values.The extrema are the maximum and minimum values.
What is the opposite of minimum?
The opposite of minimum is maximum.
When was Minimum-Maximum created?
Minimum-Maximum was created in 2005-06.
What do you call the maximum or the minimum of a parabola?
A parabola's maximum or minimum is its vertex.
