To implement armature voltage control, it must be ensured that                    

Related MCQs

• In the rotor voltage injection method, when an external voltage source is in phase with the main voltage then speed will                        
• In the rotor voltage injection method, when an external voltage source is in opposite phase with the main voltage then speed will
• must be ensured that  
• Reducing the armature voltage will give us
• The armature shaft of a DC motor must be able to withstand                              
• an external voltage source is in phase with the main voltage then speed will  
• A 6-pole lap wound DC generator has a developed power of P watts and brush voltage of E volts. Three adjacent brushes of the machine had been found worn out and got open circuited. If the machine is operated with the remaining brushes, voltage and power that could be obtained from the machine are                    
•   devices were used for voltage control applications.
• motor. The maximum allowable current is 55 A and the minimum current is about 35 A. The armature resistance of the motor is 0.4 Ω. What will be the number of sections of starter resistance required?
• A 100 hp, 250 V, 350 A shunt dc motor with an armature resistance of 0.05 ohms. To limit maximum starting current to twice the rated of its value, what will be the number of stages of starting resistances?