Electrical Machines Which of the following is/are the methods to reduce the armature reaction and its effects? compensating winding pole chamfering All of these pole stacking compensating winding pole chamfering All of these pole stacking ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A. 240 V. 150 V. 280 V. 220 V. 240 V. 150 V. 280 V. 220 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Copper brushes in DC machine are used in both of above cases. None of these where low voltage and high currents are involved. where high voltage and low current. in both of above cases. None of these where low voltage and high currents are involved. where high voltage and low current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:- 1, 3 and 4. 1, 2 and 3. 2, 3 and 4. 2 and 4. 1, 3 and 4. 1, 2 and 3. 2, 3 and 4. 2 and 4. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The emf induced in the dc generator armature winding is None of these DC AC AC and DC None of these DC AC AC and DC ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will Increase by 5%. Reduce by 5%. Remain unchanged. Depends on other factor. Increase by 5%. Reduce by 5%. Remain unchanged. Depends on other factor. ANSWER DOWNLOAD EXAMIANS APP
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