Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 75 rpm
 1500 rpm
 375 rpm
 3000 rpm

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Electrical Machines
In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?

 The speed will increase gradually.
 The speed will remains almost constant.
 The speed will increase abruptly.
 The speed will increase in proportion to reduction in load.

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