Electrical Machines Resistance commutation is used generally in case of DC machines bellow 5 kW. DC machines above 10 kW. fractional kW DC machines. None of these DC machines bellow 5 kW. DC machines above 10 kW. fractional kW DC machines. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC machine the armature mmf is rotating with respect to field poles as well as armature. rotating with respect to field poles. stationary with respect to field poles. stationary with respect to armature. rotating with respect to field poles as well as armature. rotating with respect to field poles. stationary with respect to field poles. stationary with respect to armature. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC machine current and emf in armature are unidirectional current and emf in armature are alternating. current and emf at the terminals are alternating. emf in armature conductors and at the terminals is alternating. current and emf in armature are unidirectional current and emf in armature are alternating. current and emf at the terminals are alternating. emf in armature conductors and at the terminals is alternating. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The field system of an alternator is usually excited 230 V AC. 250 / 250 V DC. 110 / 220 V AC. 3 - Φ, 50 Hz and 400 V. 230 V AC. 250 / 250 V DC. 110 / 220 V AC. 3 - Φ, 50 Hz and 400 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The synchronous reactance( Xs) is the reactance due to armature reaction of the machine combined reactance due to armature reaction and leakage flux reactance due to leakage flux reactance either due to armature reaction or leakage flux reactance due to armature reaction of the machine combined reactance due to armature reaction and leakage flux reactance due to leakage flux reactance either due to armature reaction or leakage flux ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the source voltage of a DC motor is increased, which of the following will decrease? Full load current. Starting torque, operating speed, full load current. Starting torque. Operating speed. Full load current. Starting torque, operating speed, full load current. Starting torque. Operating speed. ANSWER DOWNLOAD EXAMIANS APP
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