what article of NEC states ungrounded conductor of the motor starter is it necessary to open both the ungrounded conductor and the neutral in a single phase motor
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what article of NEC states ungrounded conductor of the motor starter is it necessary to open both the ungrounded conductor and the neutral in a single phase motor
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- Q1 • The D.C shunt generators consist of two parts, • The conditions for voltage build-up in D.C shunt generator are • The • Can be controlled the speed of de shunt motor, by changing ------- at constant and- and --- must be constant throughout the test of no load D.C shunt generator. -----------Choose the correct answer: 1- In a 3-phase squirrel cage induction motor--------- (A) Rotor conductors are short circuited through end rings (B) Rotor conductor ends are short circuited through slip rings (C) Rotor conductors are kept open (D)None of the above 2- A smaller air gap in a poly phase induction motor helps to ----- (A) Reduce the chance of crawling (B) Increase the starting torque (C) Reduce the chance of cogging (D) Reduce the magnetizing current 3- The efficiency of a three-phase induction motor can be expected to be nearly. (A)60 to 90% (B) 80 to 90% (C) 95 to 98 % (D) 99% 4-The skin effect in a deep bar induction motor is maximum when rotor is (A) At standstill (C) Running at no load 5-Deep bar or double cage (B) Running at its maximum speed (D) Running at half load O ----- rotors are used in squirrel cage induction motor to obtain (A) High starting current (B) High starting torque (C) Moderate starting current (D) Reduced rotor resistance --- 6- Which of the following…14. What is the minimum size of copper feeder conductor of TW insulation for a 5 hp, single phase, 240v motor and a 3 hp single phase, 240 motors? a. #3TW b. # 4TW c. #5TW d. #2TW
- ٥K-a. The phase angle difference between the currents in the start winding and run winding of a single-phase split-phase motor is typically 90 degrees. a) true b) false K-b. A centrifugal switch is used to disconnect the______ winding of a non-hermetically sealed single-phase split-phase motor at approximately 75% of rated speed. a) run b) start c) either "a" or "b" d) neither "a" nor "b" K-c Where an internal centrifugal switch cannot be used, an external_____ relay can be used to perform the same function in a single-phase split-phase motor. a) hot-wire b) current c) solid-state starting d) all of the aboveAnswer all or else skip the question please
- QUESTION 13 The resistance of the Armature's conductor coil(s) in most motors is: quite high, usually a few thousand ohms or more depending on the size of the motor. Typically an open circuit value on most multimeters quite low, usually a few ohms or less depending on the size of the motor. very high, usually in the megaohms.Which of the following is/are a general class of single-phase split-phase motor? a) resistance-start induction-run b) capacitor-start induction -run c) capacitor-start capacitor-run d) all of the above B)The single-phase split-phase motor operates on the principle of a rotating magnetic field. a) true b) false C)The voltages in a 2-phase power system are_______ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above D)The voltages in a 3-phase power system are_____ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above E)Which of the two stator windings used on single-phase split-phase motors is made up of smaller wire? a) start winding b) run winding c) either "a" or "b" d) neither "a" nor "b"B- 1 As the name implies, a 3-phase "dual-voltage motor" can be connected to one of two voltages. a) true b) false B-2 - A 3-phase dual-voltage motor may have_______leads. a) nine b) twelve c) either "a" or "b" d) neither "a" nor "b" B-3-Which of the following mathematically represents the relationship between Ete phase and line voltages of a WYE connected 3-phase motor? a) EPHASE = ELINE ÷ 1.732 b) ELINE = EPHASE x 1.732 c) ELINE = EPHASE X√3 d) all of the above
- Question 2 (a) Figure Q2(a) shows the percentage differential relay used for the protection of an alternator winding. The relay has minimum pickup current of 0.15 A and a percentage slope of 12%. A high resistance ground fault occurs near the grounded neutral end of the generator winding with the current distribution as shown in Table Q2(a). Identify with reason whether the relay will operate. I I CB wiłu 400/5 400/5 iz mhu Figure Q2(a) Table Q2(a) Student Name I2 (A) ID (A) 370 300The amount of short-circuit current from a motor is equal approximately to_current for each motor. A.accelerating b. locked-rotor c. stator d. final20.a. A capacitive sensor is used to detect the presence of _______ objects.A. ferrousB. nonmovingC. nonconductiveD. magnetic20.b. A three-phase motor can be made to run backwards byA. connecting a resistor in series with the armature.B. reversing the control voltage connections.C. reversing three of its power leads.D. reversing two of its power leads.
