Electrical Machines which of the following type of brush and their application is/are correct carbon brush → normal ratings copper graphite → low voltage high current density electro graphite → large ratings All of these carbon brush → normal ratings copper graphite → low voltage high current density electro graphite → large ratings All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a step down transformer which one of the following statements is true? Secondary current is less than primary current. Secondary power is less than primary power. Number of secondary turns is more than that of primary. Number of secondary turns is less than primary turns. Secondary current is less than primary current. Secondary power is less than primary power. Number of secondary turns is more than that of primary. Number of secondary turns is less than primary turns. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements: To control the speed of a dc shunt motor above the base speed over a reasonably wide range, the motor must 1. have compensating winding 2. have interpole winding 3. be started using a 3-point starter 4. be started using a 4-point starter Of these statements 1, 2 and 3 are correct 1, 2 and 4 are correct 1 and 3 are correct 2 and 4 are correct 1, 2 and 3 are correct 1, 2 and 4 are correct 1 and 3 are correct 2 and 4 are correct ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The rotor of a 3 - Φ wound induction motor is provided with single phase winding. heavy short-circuited end rings. heavy copper or aluminium bars placed in rotor slots. three phase winding. single phase winding. heavy short-circuited end rings. heavy copper or aluminium bars placed in rotor slots. three phase winding. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following voltage regulation method is accurate ? ZPF method MMf method Synchronous impedance method American standard association method ZPF method MMf method Synchronous impedance method American standard association method ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce vibrations. hysteresis loss. copper loss. eddy electric current loss. vibrations. hysteresis loss. copper loss. eddy electric current loss. ANSWER DOWNLOAD EXAMIANS APP
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