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Asked: May 23, 2023In: Electrical Engineering

Which of the following statements are true about electromagnetic torques and reluctance torques? (i) electromagnetic torque can exist only if both windings carry current (ii) reluctance torque depend on the direction of current in stator or rotor windings (iii) reluctance torque doesn't depend on the direction of current in stator or rotor windings (iv) electromagnetic torque depend on the direction of currents is and ir (v) electromagnetic torque doesn't depend on the direction of currents is and ir a) (i), (ii), (iii) b) (ii), (iii), (v) c) (i), (iii), (iv) d) (ii), (iii), (iv)

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Asked: May 22, 2023In: Electrical Engineering

Which component of torque in the following equation is called the electromagnetic torque of electromagnetic energy conversion device? Te=1/2is 2dLs/dθr+1/2ir 2dLr/dθr+isirdMsr/dθr a) 1/2is 2dLs/dθr b) 1/2ir 2dLr/dθr c) isirdMsr/dθr d) all of the mentioned

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Asked: May 22, 2023In: Electrical Engineering

In a doubly excited magnetic system with salient pole type stator and rotor, if the rotor is not allowed to move, then the equation for magnetic field stored energy in establishing the currents from zero to is and ir is __________ a) Wfld=1/2 is 2 Ls+1/2 ir 2 Lr b) Wfld=1/2 is 2 Ls+Mrs is ir c) Wfld=1/2 is 2 Ls+1/2 ir 2 Lr+Mrs is ir d) Wfld=1/2 ir 2 Lr+Mrs is ir

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Asked: May 8, 2023In: Electrical Engineering

Which of the following statements are true about electromagnetic torques and reluctance torques? (i) electromagnetic torque can exist only if both windings carry current (ii) reluctance torque depend on the direction of current in stator or rotor windings (iii) reluctance torque doesn't depend on the direction of current in stator or rotor windings (iv) electromagnetic torque depend on the direction of currents is and ir (v) electromagnetic torque doesn't depend on the direction of currents is and ir a) (i), (ii), (iii) b) (ii), (iii), (v) c) (i), (iii), (iv) d) (ii), (iii), (iv)

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Asked: May 8, 2023In: Electrical Engineering

Which component of torque in the following equation is called the electromagnetic torque of electromagnetic energy conversion device? Te=1/2is 2dLs/dθr+1/2ir 2dLr/dθr+isirdMsr/dθr a) 1/2is 2dLs/dθr b) 1/2ir 2dLr/dθr c) isirdMsr/dθr d) all of the mentioned

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Asked: May 8, 2023In: Electrical Engineering

In a doubly excited magnetic system of salient pole type stator and rotor, the reluctance torque is present only when _____________ a) both stator and rotor currents are acting b) stator current is acting alone c) rotor current is acting alone d) any of the stator or rotor currents acting alone

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Asked: May 8, 2023In: Electrical Engineering

In a doubly excited magnetic systems, the magnetic torques and forces act in such a direction as to tend to ___________ a) decrease the field energy at constant currents b) decrease the field co-energy at constant currents c) increase the field energy at constant currents d) none of the mentioned

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Asked: May 8, 2023In: Electrical Engineering

In a doubly excited magnetic system of salient pole stator and rotor, the magnetic torque (Te) depends on which of the following statements? (i) the instantaneous values of currents is and ir (ii) the angular rate of change of inductances (iii) the differential changes of current dis and dir (iv) only the instantaneous values of self inductance a) (i), (iii) b) (i), (ii)c) (iii), (iv) d) (i), (iv)

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