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Which speeds can be obtained from field control of DC shunt motor?

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Which speeds can be obtained from field control of DC shunt motor?

(a) Lower than rated speeds

(b) Greater than rated speeds

(c) Lower and greater than rated speeds

(d) Neither lower nor greater than rated speeds

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My enquiry is from Speed Control Using Field Control of Shunt Motor in chapter DC Motors of DC Machines

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Correct choice is (b) Greater than rated speeds

Easiest explanation: Speeds greater than rated speeds can be obtained by lowering the flux of shunt field motor. Field cannot be made any stronger, it can only be weakened by this method. Thus, speed lower than the rated speed can’t be obtained.

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