The speed of a dc motor can be controlled by varying

Related MCQs

• The most commonly used method of speed control of a DC motor is by varying ____.
• The speed of the slip ring induction motor can be easily controlled by
• A DC shunt motor is driving a constant torque load. On inserting an additional resistance in the armature circuit, the speed of the motor will:
• ____ motor is a variable speed motor.
• A 4 pole, 250V series motor has a wave connected armature with 1254 conductors. The flux per pole is 22mWb when the motor taking 50A. Iron and friction lossses amount to 1000W. Armature resistance 0.2Ω, series field resistance 0.2Ω. What is the speed of the motor___.
• A 4 pole, 500V shunt motor has 720 wave connected conductors on its armature. The full load armature current is 60A and flux per pole is 0.03Wb. The armature resistance is 0.2Ω and contact drop per brush is 1V. What is the full load speed of the motor?
• A 4-pole, 3-phase induction motor is running at 4 percent slip at full load. If the speed of the motor is 720 rpm, the supply frequency is
• A 3-phase , 50 Hz , 4-pole squirrel cage induction motor has its stator rewound for 6 poles without any alternations in the rotor. The motor would now run at a speed
• A 4 pole, 440V, 50Hz induction motor is running at a slip of 4%. The speed of motor is ____.
• the difference between the synchronous speed and the actual speed of an induction motor is known as