Electrical Machines The 3 - Φ induction motor with rotor circuit open will not run. make noise. run normally. get over heated. not run. make noise. run normally. get over heated. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines How can the synchronous speed of a 3 - Φ IM be varied? By varying supply voltage. By varying number of poles. By varying the supply frequency. Both (A) and (B). By varying supply voltage. By varying number of poles. By varying the supply frequency. Both (A) and (B). ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines With the increase in speed of DC motor Both back emf as well as line current fall. Back emf falls and line current increase. Both back emf as well as line current increase. Back emf increase but line current falls. Both back emf as well as line current fall. Back emf falls and line current increase. Both back emf as well as line current increase. Back emf increase but line current falls. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In travelling cranes for hoisting and lowering which type of motor is preferred? Single phase induction motor. Synchronous motor. DC series motor. AC slip ring motor. Single phase induction motor. Synchronous motor. DC series motor. AC slip ring motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The basic function of a transformer is to change the frequency the power factor the power level the level of the voltage the frequency the power factor the power level the level of the voltage ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor Increase. Decrease. Remains same. None of these. Increase. Decrease. Remains same. None of these. ANSWER DOWNLOAD EXAMIANS APP
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