Electrical Machines The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is 16.67 Hz. 25 Hz. 50 Hz. 60 Hz. 16.67 Hz. 25 Hz. 50 Hz. 60 Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following are variable losses? hysteresis loss shunt field copper loss armature copper loss eddy current loss hysteresis loss shunt field copper loss armature copper loss eddy current loss 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∝ P T∝ P³ T∝ P² T is independent of P T∝ P T∝ P³ T∝ P² T is independent of P ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is the largest conversion device? Synchronous machine All of these Induction machine DC machine Synchronous machine All of these Induction machine DC machine ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be 3.1 Ω 1.8 9 Ω 1.79 Ω 2 .1 Ω 3.1 Ω 1.8 9 Ω 1.79 Ω 2 .1 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Direction of rotation of DC motor is reversed by Reversing supply connection. Interchanging armature and field connection. Reversing armature connection or field connection. Adding resistance to field circuit. Reversing supply connection. Interchanging armature and field connection. Reversing armature connection or field connection. Adding resistance to field circuit. ANSWER DOWNLOAD EXAMIANS APP
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