Electrical Machines If a DC Series motor is connected across an AC supply it will run at lower speed. not run. run at normal speed. burn. run at lower speed. not run. run at normal speed. burn. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If an induction machine is run at above the synchronous speed it acts as a synchronous motor an induction motor None of these an induction generator a synchronous motor an induction motor None of these an induction generator ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip. P = 20, s = 3.33 %. P = 40, s = 5.79 %. P = 60, s = 0.96 %. P = 50, s = 4.43 %. P = 20, s = 3.33 %. P = 40, s = 5.79 %. P = 60, s = 0.96 %. P = 50, s = 4.43 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes : 1, 2 and 4 1 and 3 1, 2, and 3 2, 3 and 4 1, 2 and 4 1 and 3 1, 2, and 3 2, 3 and 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motor is more expensive for same KW output rating ? Synchronous motor. Induction motor. AC single phase motor. DC Shunt Motor Synchronous motor. Induction motor. AC single phase motor. DC Shunt Motor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Maximum power developed depends on both 1and 2 load angle voltage reactance both 1and 2 load angle voltage reactance ANSWER DOWNLOAD EXAMIANS APP
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