Concept explainers
R-1). The fact that a thermistor resistance increases with an increase in temperature means it has a.......
a) positive coefficient of temperature b) negative coefficient of temperature c) neither "a" or "b"
R-2). The heat producing resistive wire of a hot wire relay used to start single-phase split-phase motors is connected in__________ with the start winding.
a) series b) parallel c) either "a" or "b" d) neither "a" nor "b"
R-3). The heat producing resistive wire of a hot wire relay used to start single-phase split-phase motors is connected in___________ with the run winding.
a) series b) parallel c) either "a" or "b" d) neither "a" nor "b
R-4). The run winding and the start winding of a single-phase split-phase motor are connected in_____________________ with each other.
a) series b) parallel c) either "a" or "b" d) neither "a" nor "b"
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- B-a). A shaded-pole induction motor's rotating magnetic field is created by ___________ .a) multiple coils connected in parallel on the stator b) a capacitor connected in series with the starting windings c) a shading coil d) none of the aboveB-b). A shading coil of a single-phase shaded pole motor is designed_____________ to magnetic flux. a) concentrate b) oppose a change in c) enhance d) all of the above B-c).The shading coil of a single-phase shaded-pole motor has no influence when the current through the stator windings is at_________ electrical degrees. a) 0, 180, & 360 b) 90 & 180 c) 90 & 270 d) none of the abovearrow_forward18.a. A mechanical connection between machines is NOT needed for loading back tests ofA. induction machines.B. d-c series-wound machines.C. synchronous machines.D. d-c shunt-wound machines.18.b. The machine part which does not have any iron loss is theA. a-c motor stator.B. transformer core.C. d-c motor armature.D. alternator rotor.arrow_forward
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