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Asked: May 8, 2023In: Electrical Machines

Which of the following are applications of singly excited magnetic systems? a) electromagnets, relays b) moving-iron instruments c) reluctance motors d) all of the mentioned

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Asked: May 8, 2023In: Electrical Machines

If the salient pole rotor in a single phase reluctance motor is replaced by a cylindrical rotor, then Which of the following statements are true? (i) reluctance offered to stator flux remains constant for all rotor positions (ii) no reluctance torque will be developed (iii) reluctance torque will be developed (iv) reluctance offered to stator flux changes for all rotor positions a) (i), (ii) b) (ii), (iii) c) (iii), (iv) d) (i), (iv)

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Asked: May 8, 2023In: Electrical Machines

Single phase reluctance motors are extensively used in ________ a) grinder applications b) driving electric clocks and other timing devices c) welding applications d) lifts/ elevators

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Asked: May 8, 2023In: Electrical Machines

The single phase reluctance machine acts as a generator when angle δ is _______ a) positive b) negative c) zero d) any of the mentioned

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Asked: May 8, 2023In: Electrical Machines

For a given reluctance motor, Rld and Rlq are ________ a) constant b) varying c) zero d) all of the mentioned

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Asked: May 8, 2023In: Electrical Machines

For a reluctance motor, the maximum average torque occurs when δ = __________ a) 45° b) 90° c) 0° d) 180°

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Asked: May 8, 2023In: Electrical Machines

Reluctance motor can produce torque at ________ a) any speed less than synchronous speed b) synchronous speed only c) any speed greater than synchronous speed d) all of the mentioned

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Asked: May 8, 2023In: Electrical Engineering

The variation of reluctance Rl with space angle θr depends on the shape of __________ a) stator poles b) rotor polesc) stator or rotor poles d) both stator and rotor poles

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Asked: May 8, 2023In: Electrical Machines

The reluctance offered to the stator flux by two small air gaps in series with high permeability iron, in reluctance machine is minimum, when the space angle θr = ___________ a) 0° b) 45° c) 90° d) 270°

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Asked: May 8, 2023In: Electrical Machines

Space angle, θr is measured between stator d-axis and _______________ a) quadrature axis b) direct d-axis c) long rotor axis d) none of the mentioned

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