Electrical Machines Cogging and crawling are phenomena associated with any of the above. cage induction machines and they are essentially the same. the former during starting and the latter at a fraction of its rated speed. the former at a fraction of its rate speed and the latter during starting. any of the above. cage induction machines and they are essentially the same. the former during starting and the latter at a fraction of its rated speed. the former at a fraction of its rate speed and the latter during starting. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be B - C - A. A - C - B. C - A - B. B - C - A or C - A - B. B - C - A. A - C - B. C - A - B. B - C - A or C - A - B. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the effect of armature reaction ? Armature flux weakens the main field flux. None of the options. Armature flux distorts the main field flux. Both option B and C. Armature flux weakens the main field flux. None of the options. Armature flux distorts the main field flux. Both option B and C. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is 31.9 Ω 15.9 Ω 31.1 Ω 15.1 Ω 31.9 Ω 15.9 Ω 31.1 Ω 15.1 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines How can the synchronous speed of a 3 - Φ IM be varied? By varying number of poles. By varying supply voltage. Both (A) and (B). By varying the supply frequency. By varying number of poles. By varying supply voltage. Both (A) and (B). By varying the supply frequency. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In double cage induction motor, the inner cage offers low resistance and high reactance. high resistance and high reactance. high resistance and low reactance. low resistance and low reactance. low resistance and high reactance. high resistance and high reactance. high resistance and low reactance. low resistance and low reactance. ANSWER DOWNLOAD EXAMIANS APP
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