Search Results for: motor

Control of Traction Motors Interview Questions and Answers

Control of Traction Motors Interview Questions and Answers: 1. The resistors employed for control of traction motors are designed for short-time rating. Why ? Ans. Because control resistors are required only during starting of traction motors. 2. Under what conditions is field weakening adopted for controlling the speed of a dc series traction motor ? …

Control of Traction Motors Interview Questions and Answers Read More »

Electric Traction Motors Interview Questions and Answers

Electric Traction Motors Interview Questions and Answers: 1. Why the magnetic circuit of a traction motor is not made of cast iron ? Ans. Because cast iron cannot withstand continuous vibrations but traction motors operate in extremely severe service conditions. 2. Why the traction motor must be small in overall dimensions specially in its overall …

Electric Traction Motors Interview Questions and Answers Read More »

Thyristor Control of Electric Motors Interview Questions and Answers

Thyristor Control of Electric Motors Interview Questions and Answers: 1. Why the thyristor control is preferred over Ward Leonard system of speed control ? Ans. The thyristor control has some distinct advantages over Ward Leonard system of speed control such as low installation cost, ease of maintenance, higher accuracy, greater reliability, quick response, higher efficiency …

Thyristor Control of Electric Motors Interview Questions and Answers Read More »

Control Devices for Industrial Motors Interview Questions and Answers

Control Devices for Industrial Motors Interview Questions and Answers: 1. What are the two main applications of a thyratron ? Ans. Two main applications of thyratron are (i) switching and (ii) rectification. 2. Why is series compensating winding employed in amplidyne ? Ans. Compensating winding is connected in series with the power output brush terminals …

Control Devices for Industrial Motors Interview Questions and Answers Read More »

Protection of AC Generators and Motors Interview Questions and Answers

Protection of AC Generators and Motors Interview Questions and Answers: 1. What are the common types of generator faults ? Ans. The common types of faults occurring in synchronous generators are enumerated below. Stator winding faults — phase-to-phase faults, phase-to-earth faults and inter-turn faults. Rotor winding faults — conductor-to-earth faults, open-circuit faults, inter-turn faults. The …

Protection of AC Generators and Motors Interview Questions and Answers Read More »

Variable Reluctance Stepper Motor Working Principle

Variable Reluctance Stepper Motor Working Principle: A Variable Reluctance Stepper Motor Working Principle consists of a single or several stacks of stators and rotors-stators have a common frame and rotors have a common shaft as shown in the longitudinal cross-sectional view of Fig. 10.34 for a 3-stack motor. Both stators and rotors have toothed structure …

Variable Reluctance Stepper Motor Working Principle Read More »

Scroll to Top