Which one of the following single-phase motors is best suitable when quietness of operation is a consideration? a. b. c.

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Which One Of The Following Single Phase Motors Is Best Suitable When Quietness Of Operation Is A Consideration A B C 1 (36.25 KiB) Viewed 30 times

Which One Of The Following Single Phase Motors Is Best Suitable When Quietness Of Operation Is A Consideration A B C 2 (34 KiB) Viewed 30 times

Which One Of The Following Single Phase Motors Is Best Suitable When Quietness Of Operation Is A Consideration A B C 3 (33.47 KiB) Viewed 30 times

Which one of the following single-phase motors is best suitable when quietness of operation is a consideration? a. b. c. d. Split-phase motor Dual capacitor motor universal motor repulsion motor In a single-phase induction motor, what task does the centrifugal switch has? a. b. C. d. to disengage the start winding @ 75% of full speed. to disengage the start winding @ 25% of full speed. to engage the run winding @ 75% of full speed. to engage the run winding @ 25% of full speed. How can the direction of rotation of a split-phase motor be reversed? a. b. C d. reverse the entire motor reverse the armature reverse the connection of the start or run winding reverse the connection of the start and run winding How many degrees out of phase should the current in the start winding be with the current in the run winding to develop maximum torque? a. 45 degree b. 30 degree c. O degree d. 90 degree
Which one of the following statement in regard to the start / run winding in a split-phase motor is correct? a. b. run winding (thick wire / low resistance) start winding (thin wire / high resistance) run winding (thin wire / low resistance) start winding (thick wire/ high resistance) run winding (thick wire / low resistance) start winding (thin wire / low resistance) run winding (thin wire / high resistance) start winding (thin wire/ high resistance) c. d. 6. What is the excitation current in regard to transformers? a. The excitation current is the amount of current necessary to magnetize the iron core of the transformer. The excitation current is the amount of current necessary to saturate the iron core of the transformer. b. c. The excitation current is the amount of do-current necessary to magnetize the iron core of the transformer. The excitation current is the amount of current necessary to magnetize the secondary side of the transformer. d. 7 A transformer has a primary voltage of 120V and a secondary voltage of 24V. If the windings are connected subtractive, what voltage will appear across the entire connection? Hint: See figure a b TOJ وی ده tuit m 120V 24V 144V 96V d
B. a. Name one advantage and one disadvantage of an autotransformer? advantage: isolation between primary and secondary side disadvantage: expensive b. advantage: less expensive disadvantage: no isolation between primary and secondary side advantage: less expensive disadvantage: efficiency is less than 50% advantage: very efficient disadvantage: expensive c. d. A split-phase motor has three leads and they are marked as (a, b, and c). The resistance between (a - b) is 525 ohms. (a -c) is 775 ohms and (b-C) is 250 ohms. The run winding is connected between which leads? a b. ع ن ه ی a-b a-c b-c a - to the ground wire d. The nameplate of a voltage transformer is shown to the right. The polarity is additive. What is the maximum current the transformer can draw on the 120V secondary side? HOWARD GEDUSTRIES 1526ADO +7200/124707 120/40 a. b. c d. 125A 62.5A 8.0A 16.0A 19 74623291