Electrical Machines The air gap between the yoke and armature is dc machine is kept very small to avoid over heating. All of these to achieve a stronger magnetic field. to avoid locking of the armature. to avoid over heating. All of these to achieve a stronger magnetic field. to avoid locking of the armature. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For very sensitive and wide speed control, the preferable control method is Ward-Leonard control. Multiple voltage control. Field control. Armature control. Ward-Leonard control. Multiple voltage control. Field control. Armature control. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For small value armature current Ia the torque developed by a DC series motor is proportional to Ia. Ia2. √Ia. 1/Ia. Ia. Ia2. √Ia. 1/Ia. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What happens if fifth multiples of harmonics is given to induction motor? Fail to start. It will rotates in normal operation. Either short circuit or open circuit occurs. It will rotates in reverse direction. Fail to start. It will rotates in normal operation. Either short circuit or open circuit occurs. It will rotates in reverse direction. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is 96 V 384 V 192 V 768 V 96 V 384 V 192 V 768 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then both decrese Ia remains constant but ωm increase Ia increases and ωm decreses both armature current Ia and speed ωm increase both decrese Ia remains constant but ωm increase Ia increases and ωm decreses both armature current Ia and speed ωm increase ANSWER DOWNLOAD EXAMIANS APP
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