Electrical Machines Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as 3 at 90°C. 1 at 90°C. 2 at 90°C. 0.5 at 90°C. 3 at 90°C. 1 at 90°C. 2 at 90°C. 0.5 at 90°C. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If a DC Series motor is connected across an AC supply it will run at normal speed. run at lower speed. not run. burn. run at normal speed. run at lower speed. not run. burn. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp? 20 N. 15 N. Can't be determined. None of these. 20 N. 15 N. Can't be determined. None of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following machine is invariably provided with forced ventilation? 50 MW generator in a power plant. Fractional horse power slow speed motor. Hermetically sealed motor of refrigerator. Fractional horse power high speed motor. 50 MW generator in a power plant. Fractional horse power slow speed motor. Hermetically sealed motor of refrigerator. Fractional horse power high speed motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Field weakening control method is used for the _________ ? None of these below rated speed above rated speed both A and B None of these below rated speed above rated speed both A and B ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following DC Motor uses 4-point starter? DC compound motor. DC shunt motor with armature resistance. DC series motor. DC shunt motor with field weaking control. DC compound motor. DC shunt motor with armature resistance. DC series motor. DC shunt motor with field weaking control. ANSWER DOWNLOAD EXAMIANS APP
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