Electrical Machines A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be 2.7 mWb. 3.5 mWb. 1.2 mWb. 1.4 mWb. 2.7 mWb. 3.5 mWb. 1.2 mWb. 1.4 mWb. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The use of double squirrel cage winding on the rotor provides higher efficiency. low noise. reduced starting torque. a large starting torque. higher efficiency. low noise. reduced starting torque. a large starting torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The demagnetising component of armature reaction in a DC generator reduces inter poles flux density. increases armature speed. reduces generator emf. results in sparking trouble. reduces inter poles flux density. increases armature speed. reduces generator emf. results in sparking trouble. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by varying the applied voltage. changing the load. changing the field excitation. varying the speed. varying the applied voltage. changing the load. changing the field excitation. varying the speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What does the use the of height flux density value in transformer design lead to? Increase in weight/KVA. Reduced copper loss. Decrease in weight/KVA. Reduced iron loss. Increase in weight/KVA. Reduced copper loss. Decrease in weight/KVA. Reduced iron loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction effect is more in which of the following methods? same in both methods field weakening method armature resistance control None of these same in both methods field weakening method armature resistance control None of these ANSWER DOWNLOAD EXAMIANS APP
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