Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

  DC of slip frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.
 AC of supply frequency.
 DC.

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

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Electrical Machines
An inverted V curve of synchronous motor shows variation of

  power factor and DC excitation at constant load.
 supply voltage and field current at constant excitation.
 power factor and supply voltage during hunting.
 supply voltage and excitation current at constant load.

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