Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 1.79 Ω
 1.8 9 Ω
 2 .1 Ω
 3.1 Ω

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will run in reverse direction.
 The motor will run at its normal speed in the same direction as before.
 The motor will stop.
 The motor will run much faster in the same direction.

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Electrical Machines
In a transformer

 both Oc and SC tests are conducted on HV side
 both OC and SC tests are conducted on LV side
 OC test is conducted on LV side and SC test is conducted on HV side
 OC test is conducted on HV side and SC test is conducted on LV side

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