Electrical Machines In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then E ∝ f/φ E ∝ 1/(φf) E ∝ φ/f E ∝ φf E ∝ f/φ E ∝ 1/(φf) E ∝ φ/f E ∝ φf ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When an electric train is moving down a hill, the DC motor will operate as DC series motor. DC series generator. DC shunt generator. DC shunt motor. DC series motor. DC series generator. DC shunt generator. DC shunt motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed? 16.55 Nm 15.28 Nm Zero 15.6 Nm 16.55 Nm 15.28 Nm Zero 15.6 Nm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed regulation of a DC motor is given as NnL − NfL. NnL/NfL. (NnL − NfL)/NfL. (NfL − NnL)/NnL. NnL − NfL. NnL/NfL. (NnL − NfL)/NfL. (NfL − NnL)/NnL. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The overall power factor of an on load transformer depends on the power factor of the load. is always unity. is always lagging. is always leading. depends on the power factor of the load. is always unity. is always lagging. is always leading. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines During hunting of a synchronous motor field excitation increases. harmonic are developed in the armature circuit. damper bar develops torque. negative phase sequence currents are generated. field excitation increases. harmonic are developed in the armature circuit. damper bar develops torque. negative phase sequence currents are generated. ANSWER DOWNLOAD EXAMIANS APP
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