Electrical Machines When the supply terminal of a DC shunt motor are interchanged The direction of rotation will reverse. The motor will run at its normal speed in the same direction as before. The motor will run much faster in the same direction. The motor will stop. The direction of rotation will reverse. The motor will run at its normal speed in the same direction as before. The motor will run much faster in the same direction. The motor will stop. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is 150Hz. 50Hz. 100Hz. 200Hz. 150Hz. 50Hz. 100Hz. 200Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is 2 and 3 1 and 2 1 and 3 1 alone 2 and 3 1 and 2 1 and 3 1 alone ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is 1, 4 1, 3 2, 4 2, 3 1, 4 1, 3 2, 4 2, 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as 1 at 90°C. 0.5 at 90°C. 2 at 90°C. 3 at 90°C. 1 at 90°C. 0.5 at 90°C. 2 at 90°C. 3 at 90°C. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Breadth factor is defined as the ratio of emf with distributed winding to emf with concentrated winding. emf with concentrated winding to emf with distributed winding. None of these both 1 and 2. emf with distributed winding to emf with concentrated winding. emf with concentrated winding to emf with distributed winding. None of these both 1 and 2. ANSWER DOWNLOAD EXAMIANS APP
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