Electrical Machines What is the necessity of copper brushes in a dc motors? None of these. To convert alternating supply current to direct current. To increase the flux cutting by the rotor. To absorb the mechanical shocks produced during running condition. None of these. To convert alternating supply current to direct current. To increase the flux cutting by the rotor. To absorb the mechanical shocks produced during running condition. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which type of motors are preferred in lifts? DC shunt motors. None of these DC compound motors. DC series motors. DC shunt motors. None of these DC compound motors. DC series motors. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________. 30 %. 1.5 %. 5 %. 2.67 %. 30 %. 1.5 %. 5 %. 2.67 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The torque speed characteristics of a AC servomotor is approximately linearised any of the above hyperbola parabola linearised any of the above hyperbola parabola ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If starter is not used with large DC motor for starting, it will draw a starting current many times its rated full load current. provide execessive voltage drop in line. all of above. damage the armature and commutator. draw a starting current many times its rated full load current. provide execessive voltage drop in line. all of above. damage the armature and commutator. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively? 1600 W and 1250 W 3200 W and 5200 W 1600 W and 5000 W 3200 W and 2500 W 1600 W and 1250 W 3200 W and 5200 W 1600 W and 5000 W 3200 W and 2500 W ANSWER DOWNLOAD EXAMIANS APP
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