(a) paramagnetic
(b) ferromagnetic
(c) diamagnetic
(d) non-magnetic
Answer: B
(a) 15º
(b) 30º
(c) 45º
(d) 60º
Answer: C
(a) 4000
(b) 8000
(c) 6000
(d) 10,000
Answer: C
(a)4
(b)2
(c)3
(d)6
Answer: A
(a) windings
(b) commutator
(c) brushes
(d) all of the above.
Answer: D
(a) mechanical
(b) electrical
(c) analogue
(d) incremental
Answer: D
(a) shaft load
(b) step pulse frequency
(c) polarity of stator current
(d) magnitude of stator current.
Answer: B
(a) A, B, C, A …………………..
(b) A, C, B, A …………………..
(c) AB, BC, CA, AB …………………..
(d) A, AB, B, BC …………………..
Answer: D
(a) dc to dc
(b) ac to ac
(c) dc to ac
(d) digital-to-analogue
Answer: D
(a) 60º
(b) 45º
(c) 30º
(d) 15º
Answer: B
(a) microstepping
(b) half-stepping
(c) increased step angle
(d) reduced resolution.
Answer: B
(a) reluctance
(b) detent
(c) holding
(d) either (b) or (c)
Answer: D
(a) 15º
(b) 30º
(c) 45º
(d) 90º
Answer: A
(a)CX and CT
(b)CX and CR
(c)CX and CD
(d)CT and CD
Answer :B
(a) increase its rotor resistance
(b) control its torque
(c) decrease its intertia
(d) decouple its torque and flux.
Answer:D
(a) differential
(b) transformer
(c) receiver
(d) transmitter
Answer:A
(a) electronic switching
(b) slow speeds
(c) static conditions
(d) both (b) and (c).
Answer:D
(a) torque transmission
(b) error detection
(c) instrument servos
(d) robot arm positioning.
Answer:D
(a) control transmitter
(b) control transformer
(c) control receiver
(d) both (a) and (b).
Answer:D
(a) control transmitter
(b) control receiver
(c) control differential transmitter
(d) all of the above.
Answer:D
(a) brushless dc motor
(b) disk motor
(c) permanent-magnet synchronous motor
(d) stepper motor.
Answer:C
(a) has rotor poles of ferromagnetic material
(b) rotates continuously
(c) is designed for open-loop operation only
(d) has lower efficiency.
Answer:B
(a) 120º
(b) 90º
(c) 60º
(d) 45º
Answer:B
(a) permanent-magnet d.c. motor
(b) disk d.c. motor
(c) permanent-magnet synchronous motor
(d) brushless d.c. motor.
Answer:A
(a) they depend on rotor position.
(b) they are in phase.
(c) they differ in magnitude.
(d) they are polyphase voltages.
Answer:D
(a) electronic switching
(b) slow speeds
(c) static conditions
(d) both (b) and (c).
Answer:D
(a) loads
(b) frequencies
(c) speeds
(d) voltages.
Answer:C
(a) higher rotor resistance
(b) higher power rating
(c) motor stator windings
(d) greater inertia.
Answer:A
(a) it has three-phase stator winding
(b) it has a rotor of dumbell construction
(c) it has a mechanical damper on its shaft
(d) it has single-phase rotor excitation.
Answer:C
(a) has rotor poles of ferromagnetic material
(b) rotates continuously
(c) is designed for open-loop operation only
(d) has lower efficiency.
Answer:B
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