Electrical Machines Slip rings of an induction motors are made of carbon. phosphor bronze. aluminium. stainless steel. carbon. phosphor bronze. aluminium. stainless steel. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What happens if fifth multiples of harmonics is given to induction motor? It will rotates in normal operation. Either short circuit or open circuit occurs. It will rotates in reverse direction. Fail to start. It will rotates in normal operation. Either short circuit or open circuit occurs. It will rotates in reverse direction. Fail to start. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Centrifugal switch is absent in which of the single phase induction motor? Split phase motor. Shaded pole motor. PSC (permanent split capacitor) motor. None of these Split phase motor. Shaded pole motor. PSC (permanent split capacitor) motor. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Minimum allowable resistivity of power transformer insulating oil is generally taken as 1 X 1012 Ω - cm at 27°C and 0.1 X 1012 2 X 1012 Ω - cm at 27°C and 0.2 X 1012 3 X 1012 Ω - cm at 27°C and 0.3 X 1012 4 X 1012 Ω - cm at 27°C and 0.4 X 1012 1 X 1012 Ω - cm at 27°C and 0.1 X 1012 2 X 1012 Ω - cm at 27°C and 0.2 X 1012 3 X 1012 Ω - cm at 27°C and 0.3 X 1012 4 X 1012 Ω - cm at 27°C and 0.4 X 1012 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The magnetic field which initially induces emf in the armature in a self excited DC generator is because of permanent magnets. residual magnetism. None of these armature reaction. permanent magnets. residual magnetism. None of these armature reaction. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC machine current and emf at the terminals are alternating. current and emf in armature are alternating. emf in armature conductors and at the terminals is alternating. current and emf in armature are unidirectional current and emf at the terminals are alternating. current and emf in armature are alternating. emf in armature conductors and at the terminals is alternating. current and emf in armature are unidirectional ANSWER DOWNLOAD EXAMIANS APP
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