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

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Q. Why starters are required in a DC motor?

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Q. For which motors DOL starter can be used?

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Q. A three-point starter is used for _________

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

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

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

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Q. Motor will start quickly when used without starter.

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

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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?

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

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Q. Four-point starter is used when ______________

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

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Q. How much torque is ensured by resistance adding arrangement in 3-point starter?

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Q. The resistance of NVC is _______

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Q. NVC will release the handle electromagnetically when ________

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Q. Over-load coil performs the function when __________

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Q. In 4-point starters the resistance is added in series with NVC because __________________

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Q. What will be the γ value for starter taking 4 steps, where ratio of resistance at maximum allowable current to armature resistance is equal to 1.8?

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Q. Maximum allowable current for a 240-V DC shunt motor is equal to 65 A. Minimum allowable current for same is equal to 40 A. What will be the value of γ?

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