Electrical Machines A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is 230 V some what less than 230 V not possible some what more than 230 V 230 V some what less than 230 V not possible some what more than 230 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of conductor of a DC motor can be determined by Ampere law. Lenz's law. Fleming's left hand rule. Fleming's right hand rule. Ampere law. Lenz's law. Fleming's left hand rule. Fleming's right hand rule. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is 1, 2, 3 2, 3, 4 2, 3, 4, 5 2, 3 ,5 1, 2, 3 2, 3, 4 2, 3, 4, 5 2, 3 ,5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be 15.6 Nm 16.55 Nm 15.92 Nm 15.28 Nm 15.6 Nm 16.55 Nm 15.92 Nm 15.28 Nm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC compound motor the field regulator is provided to demagnetize the field partially. control the armature flux. control the field flux. limit the armature current. demagnetize the field partially. control the armature flux. control the field flux. limit the armature current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The inertia constant H of a synchronous condenser is greater than that of hydro generator. greater than that of turbo alternator. none of these. equal to that of the effective length of the line. greater than that of hydro generator. greater than that of turbo alternator. none of these. equal to that of the effective length of the line. ANSWER DOWNLOAD EXAMIANS APP
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