Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 1, Problem 8SQ
To determine
Choose the correct option that represents the conditions, which affect the starting and stopping of a motor and its machinery.
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Below is a diagram of a DC motor and the mechanical load connected to it. Which statement is wrong?
A. The speed of the motor ea increases with increasing
B. The torque of the motor increases with increasing ia
C. eb increases and speed decreases
D. if increasing. the torque of the motor increases
E. None
Motors have many uses. Describe a motor you have experience with. What is it being used for, what power source it uses, and possibly it’s configuration. Explain why you picked this motor and if you have/need to perform(ed) any maintenance on it.
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QUESTION from book ELECTRIC MACHINE-1
LAB BASESD QUESTION
Answer precisely keeping in view the experiments performed with the equipment in the lab.i. You are working with the DC motor and the motor is accelerating. Suggest a way that canoptimally control the speed of the motor. Explain the method and how it is a better way.ii. What type of DC motor should be used when the load connected requires a higher starting torque?Precisely explain and draw the relevant circuit.iii. What will happen to a DC series motor if the load is suddenly thrown off the motor? You canexplain with any mathematical reasoning.iv. What effect will the load have on a DC shunt motor with significantly high armature resistance?v. For the four-point DC starter kit, what will happen if the series resistances are connected in reverseorder. Draw and explain how this combination is better than the 3 points started.
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- 22) What type of conversion is happening in a DC Motor. a. DC electrical energy to mechanical energy b. AC electrical energy to mechanical energy c. Mechanical to AC Electrical Energy d. Mechanical to DC Electrical Energyarrow_forwardA motor will undergo three major conditions throughout its operation. State and explain what takes place for each of these conditions.arrow_forward14.a. Jogging a motor is accomplished byA. manually turning its shaft.B. reducing its armature current.C. momentarily energizing the starter.D. blocking the motor from rotating.14.b. How does change in resistance affect the speed of a DC motor?A. Increasing the armature resistance decreases the motor's speed.B. Reducing the field resistance increases the motor's speed.C. Increasing the field resistance decreases the motor's speed.D. Reducing the armature resistance decreases the motor's speed.arrow_forward
- Torque is ______. Select one: A. STRENGTH THAT A MOTOR PRODUCES BY TURNING B. ROTATING MOTION C. A MOTOR UNDER LOAD D. ALL OF THE ABOVEarrow_forwardQ51 Which NEC table is used to determine the full-load current of a torque motor? Select one: A. NEC TABLE 430.6(B) B. NEC TABLE 430.7(B) C. NEC TABLE 430.24 D. NEC TABLE 430.22arrow_forwardDC Motors 1. Specify the system where the machine is use. 2. Specify the ratings and related description of the machine pertaining to capacity. 3. Explain how the machine is use, its purpose and operation. 4. What are the problems and troubles encountered in the operation. 5. What are the maintenance program implemented for the machines proper operation.arrow_forward
- 25. Which of the following is/are a general method of starting squirrel-cage motors'? a) full voltage starting b) reduced voltage starting c) both "a" and "b" d) neither "a" nor "b"arrow_forward15. What are the following statements are true for DC Motor? I. Motor converts Electrical Energy to Mechanical Energy II. Motor supply current to the armature winding III. Back EMF is lesser than the Supply voltage IV. Fleming's Right-hand rule a. I and II b. II and IV c. I,II and III d. I,II and IVarrow_forwardChoose a modern house of your interest, identify any ONE application of the DC electrical machine in the modern house and answer the following a) Identify the type of the DC machine used and its specifications b) Identify the load characteristics of the DC machine used. c) Explain the operation of the DC machine used with detailed diagrams. d) Explain the functions/roles/importance of the DC machine in the application e) Compare the speed control method used in the application with that of the armature or field control method.arrow_forward
- The following information is given for a 300kW, 600V, long shunt compound DC generat or, shunt field resistance is 75 ohms, armature resistance 0.01, brush resistance is 0.011 ohrms, series field resistance is 0.012 ohms and the divert or resistance of 0.036 ohms.When the machine is delivering full load; a. Draw the circuit diagrarn b. Calculate the voltage and C Power generated by the armat ure.arrow_forwardQ3/ Chose the correct answer for the following 1. Synchronous motors are generally not self-starting because (a) the direction of rotation is not fixed (b) the direction of instantaneous torque reverses after half cycle (c) startes cannot be used on these machines (d) starting winding is not provided on the machines 2. The power developed by a synchronous motor will be maximum when the load angle is (a) Zero (b) 45° (c) 90° (d) 120° 3. An over-excited synchronous motor takes (a) leading current (b) lagging current (c) both (a) and (b) (d) none of the above 4. In a synchronous motor, the magnitude of stator back e.m.f. £& depends on (a) d.c. excitation only (b) speed of the motor (c) load on the motor (d) both the speed and rotor flux 5. A pony motor is basically a (a) small induction motor (c) D.C. shunt motor (b) D.C. series motor (d) double winding A.C./D.C. motorarrow_forwardExplain the characteristics and how the following motor starters work. 1.Slip Ring a. Variable Resistance b. Fixed Starting Resistancearrow_forward
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