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Electrical Drives and Controls (EDC) MCQs | Page - 19

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Q. 181) 1 Btu/h is equal to

(A) .641

(B) .334

(D) .417

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Q. 182) Full form of IDMT is

(A) inverse definite minimum time

(B) inverter definite minimum time

(D) insert definite minimum time

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Q. 183) Full form of THD is

(A) total harmonic diverter

(B) total harmonic digital

(D) total harmonic discrete

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Q. 184) Calculate the value of THD if the distortion factor is .8.

(A) 76 %

(B) 75 %

(D) 73 %

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Q. 185) Second lowest order harmonic present in 3-Φ fully controlled rectifier is

(A) 5th

(B) 7th

(D) 2nd

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Q. 186) The flux and the internally generated voltage of a dc machine is a                   function of its magneto-motive force.

(A) non-linear

(B) linear

(D) inverse

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Q. 187) Choose the best option which identifies about the below characteristics.

(A) (1)series motor (2) cumulative compound motor (3) shunt motor

(B) (1)cumulative compound motor (2) series motor (3) shunt motor

(D) (1)shunt motor (2) series motor (3) cumulative compound motor

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Q. 188) The speed torque of the differential compound dc motor is shown below. What conclusions can be made?

(A) this is an unstable machine

(B) there is regenerative increment in the speed

(D) all of the mentioned

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Q. 189) A student is given a differential compound motor and he has been asked to make it start. How will he try?

(A) by shorting series field at start

(B) to run as shunt motor at start

(D) all of the mentioned

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Q. 190) For a 100 hp 250 V, compound dc motor with compensating winding has a field current of 5 A to produce a voltage of 250 V at 1200 rpm. What will be the shunt field current of this machine at no load?

(A) 5 a

(B) 5.6 a

(D) 0 a

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