Electrical Machines How can the synchronous speed of a 3 - Φ IM be varied? By varying the supply frequency. Both (A) and (B). By varying number of poles. By varying supply voltage. By varying the supply frequency. Both (A) and (B). By varying number of poles. By varying supply voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements regarding the magnetization characteristics of a dc generator : 1. It represents the variation of field flux with field current. 2. Variation of open-circuit terminal voltage with field current is independent of speed 3. It is non-linear from zero to rated field current 4. It helps to determine the critical field resistance at a given speed 5. It always starts from the origin Which of these statements are correct ? 2, 3 and 4 1, 2 and 5 3 and 5 1 and 4 2, 3 and 4 1, 2 and 5 3 and 5 1 and 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an alternator the voltage generated per phase is proportional to frequency of waveform. number of turns in coil. flux per pole. All of these frequency of waveform. number of turns in coil. flux per pole. All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Induction motors have the advantage of less cost. less maintenance. simple in construction. all of below. less cost. less maintenance. simple in construction. all of below. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following induction motor has maximum speed? 4 pole. 8 pole. 2 pole. 6 pole. 4 pole. 8 pole. 2 pole. 6 pole. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When an electric train is moving down a hill, the DC motor will operate as DC series generator. DC shunt generator. DC shunt motor. DC series motor. DC series generator. DC shunt generator. DC shunt motor. DC series motor. ANSWER DOWNLOAD EXAMIANS APP
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