Electrical Machines If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to? 1000 rpm 940 rpm 950 rpm 975 rpm 1000 rpm 940 rpm 950 rpm 975 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following DC Motor uses 4-point starter? DC shunt motor with armature resistance. DC shunt motor with field weaking control. DC compound motor. DC series motor. DC shunt motor with armature resistance. DC shunt motor with field weaking control. DC compound motor. DC series motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC series motor must started on no load because it would Draw more current without producing sufficient torque. Fail to start without load. Run at dangerously high speed. Not develop starting torque. Draw more current without producing sufficient torque. Fail to start without load. Run at dangerously high speed. Not develop starting torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a three phase slip-ring induction motor, brushes are connected to external star-connected resistors. 3 - Φ AC supply. equalizing coils. DC supply. external star-connected resistors. 3 - Φ AC supply. equalizing coils. DC supply. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the excitation is increased, the power factor is unity power factor leading power factor None of these lagging power factor unity power factor leading power factor None of these lagging power factor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is 460 A. 250 A. 340 A. 570 A. 460 A. 250 A. 340 A. 570 A. ANSWER DOWNLOAD EXAMIANS APP
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