Dear candidates you will find MCQ questions of Electrical Drives and Controls (EDC) here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Explanation: using the dynamic equation of motor j×(angular acceleration) = motor torque – load torque: 5×(angular acceleration) = 80-30=50, angular acceleration=10 rad/s2.
Explanation: using the dynamic equation of motor j×(angular acceleration) = motor torque – load torque: .541×(angular acceleration) = 2-10=-8, angular acceleration=-14.78 rad/s2. the load torque is greater than the motor torque. the motor will fail to start.
Explanation: the direction of the single- phase im can be reversed by changing the direction of auxiliary winding or main winding current.the net torque developed in the im is imiasin(Φ).
Explanation: intermittent periodic motor is preferred for overhead traveling cranes.
Explanation: thermography is used to detect heat patterns. it uses an infrared rays camera. this test is used to determine the conditions where electric motors are being used.
Explanation: as the size of the motor increases its speed decreases. the range of size of the motor (kw) for efficiency nearly equals to 90 % is 15-150. the efficiency increases as the size increases.
Explanation: the heat loss can be calculated using the joule law of heating effect. the
Explanation: one british thermal unit is equal to .293 watt. 1 btu/h is the amount of energy requires to increase the temperature of one pound of water by 1β.
Explanation: overloading can be prevented using over-current protection. it will detect the over-current and interrupt the supply.
Explanation: the most common cause of motor failure is low resistance. overheating, corrosion can damage the insulation of the windings which leads to low resistance.
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