Q. If a DC motor designed for 45°C ambient temperature is to be used for 55°C ambient temperature, then the motor ___________

View solution

Q. Torque developed by a DC motor depends upon _____________

View solution

Q. For very sensitive and wide speed control, which of the following method is preferred?

View solution

Q. Field weakening control method is used for the speed _________

View solution

Q. Armature resistance control method is used for the speed _____________

View solution

Q. Which function is performed by counter emf of a DC motor?

View solution

Q. The output power of any electrical (AC or DC) motor is taken from the ______________

View solution

Q. Why field winding of a DC series motor is provided with thick wire?

View solution

Q. Why starters are required in a DC motor?

View solution

Q. For which motors DOL starter can be used?

View solution

Q. A three-point starter is used for _________

View solution

Q. The starting resistance of a DC shunt motor is generally ______

View solution

Q. In a manual shunt motor starter relay positions are ________________________

View solution

Q. What will happen if DC motor is used without starter?

View solution

Q. Motor will start quickly when used without starter.

View solution

Q. In shunt and compound motor starting the shunt field should be made on with full starting resistance in ____________

View solution

Q. A starter is required for a 220-V shunt 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?

View solution

Q. γ is given as 1.585. Resistance at maximum allowable current is given equal to 4 Ω, what is the 5th step resistance?

View solution

Q. Four-point starter is used when ______________

View solution

Q. In three-point starter, as a starting handle is rotated __________

View solution