Q. Which of the following is not a reason, behind failing of self-exciting machine?

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Q. By changing the polarity of the armature of failed self-exciting machine, machine can be started.

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Q. Which of the following will be useful to generate positive feedback?

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Q. Characteristics of separately excited DC generator are drawn by keeping _____

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Q. What is the reason behind dropping down of Eₐ with load?

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Q. External characteristic differ from an internal characteristic in separately excited DC generator by _________

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Q. The variation in terminal voltage of DC shunt generator with respect to variation in separately excited DC generator is ___________

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Q. Which of the following characteristic lies above of all others?

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Q. Why differential compound generator is not used in practice?

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Q. How compounding level in a compound machine is adjusted?

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Q. Which of the following have different external characteristic than other?

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Q. For series DC generator, internal/external characteristic start from ____________

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Q. For a given DC series generator with critical resistance equal to 100 Ω, armature resistance is equal to 50 Ω, and series field resistance is equal to 20 Ω, is connected across load of 50 Ω. What will be the load voltage?

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Q. No load point of DC generator is __________

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Q. Rf line intersects with OCC in ________

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Q. How armature resistance effect is shown graphically?

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Q. For determining IₐRₐ maximum _____________

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Q. How demagnetization effect of armature reaction is shown graphically?

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Q. External characteristics of DC shunt motor lies in ______________

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Q. From magnetization characteristic at If = 7.1 A, Eₐ = 225 V at 1000 rpm. What will be the terminal voltage at speed 950 rpm?

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