Electrical Machines In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be PN/3000. PN/120. PN/2. PN/60. PN/3000. PN/120. PN/2. PN/60. 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
Electrical Machines The ___________________ generator has the poorest voltage regulation. differential compounded. shunt. over compounded. under-compounded. differential compounded. shunt. over compounded. under-compounded. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P) T is independent of P T∝ P² T∝ P³ T∝ P T is independent of P T∝ P² T∝ P³ T∝ P ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The brushes of a DC machine should be placed on the commutator in the polar axis. armature in the polar axis. commutator in the inter polar axis. armature midway between poles. commutator in the polar axis. armature in the polar axis. commutator in the inter polar axis. armature midway between poles. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ? 240 V. 150 V. 210 V 230 V. 240 V. 150 V. 210 V 230 V. ANSWER DOWNLOAD EXAMIANS APP
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