Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 3, Problem 23SQ
To determine
Choose the best option that represents the nature of the current that drawn by the motor.
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Students have asked these similar questions
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 Energy
State the correct terminology used to describe each of the following
1.the current drawn by a motor at standstill with the rate voltage and frequency applied.
2.the twisting or turning force of a motor .
3.the deference in speed between the motion and the rotation of the rotor shaft.
4.a device that provides and adjustable time period to perform a function.
How is the combined pump–motor efficiency of a pump and motor system defined? Can the combined pump–motor efficiency be greater than either the pump or the motor efficiency? Explain.
Chapter 3 Solutions
Electric Motor Control
Ch. 3 - Prob. 1SQCh. 3 - How many poles are required on motor starters for...Ch. 3 - If a motor starter is installed according to...Ch. 3 - Using the time limit overload or the dashpot...Ch. 3 - What causes the AC hum or chatter in AC...Ch. 3 - What is the phase relationship between the flux in...Ch. 3 - In what AC and DC devices is the principle of the...Ch. 3 - What does the electrician look for to remedy the...Ch. 3 - What type of protective enclosure is most commonly...Ch. 3 - What advantage is there in using combination...
Ch. 3 - What safety feature does the combination starter...Ch. 3 - Prob. 12SQCh. 3 - How is the size of the overload heaters selected...Ch. 3 - What type of motor starter enclosure (include NEMA...Ch. 3 - Prob. 15SQCh. 3 - Prob. 16SQCh. 3 - Prob. 17SQCh. 3 - Prob. 18SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 20SQCh. 3 - Prob. 21SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 23SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 28SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 30SQCh. 3 - Prob. 31SQCh. 3 - What is the difference between a grounded control...Ch. 3 - A control transformer has a primary voltage of 480...
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- Q2] Fill in the blank (9 Marks) 1- The critical resistance of the D.C. generator is the resistance of 2- A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly volt. 3- The current drawn by a 120 V D.C. motor of armature resistance 0.5 2 and back e.m.f. 110 V is ampere. 4- The direction of rotation of a D.C. motor can be reversed by V2 VI 5- A 440V/110Vtransformer has 1000 turns on the primary winding. The number of turns on the secondary is 6- The main purpose of performing open circuit test on a transformer is to measure its 7-A 3-phase, 4-pole, 50 Hz induction motor runs at a speed of 1440 r.p.m. The rotating field produced by the rotor rotates at a speed of respect to the rotor. r.p.m. with 8- The advantages of skewing in induction motor are andarrow_forward3) A In which of the following application DC series motor is used: A. Centrifugal Pump B. Motor Operation in DC and AC C. Water pump drive D. Starter for car E. All abovearrow_forward3. The terminal voltage of a motor is 240 volts and its armature current is 60A. The armature resistance is .08 ohm. What is the hp developed by the motor. 3.arrow_forward
- 15. 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_forward23.a. Which one of the following devices can be used to accurately and conveniently measure the speed of amotor with a small slip?A. TachometerB. Revolution counter and stop watchC. Incandescent lamp and colored diskD. Stroboscope23.b. Core loss can be described asA. due to hysteresis and eddy currents in the iron parts.B. directly dependent on the load.C. caused by insufficient ventilation in the machine.D. due to eddy currents in the windings.arrow_forwardBelow 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. Nonearrow_forward
- A type of resistance device that can be placed in a DC motor circuit and varied to limit the speed of a motor is called a A. potentiometer. B. variable reluctor. C. rheostat.D. power resistor.arrow_forwardHow can you reduce the amount of voltage applied to the motor during inching?arrow_forwardO1. Which of the following is the correct formula to determine the efficiency of a DC motor? a) % efficiency = (power in ÷ power out) x 100 b) % efficiency = (power out ÷ power in) x 100 c) % efficiency = (power out x power in) ÷ 100 d) none of the above. O2. A brushless DC motor does not have_____________.a) a wound armature b) a commutator c) brushes d) all of the above O3. The speed of a brushless DC motor is determined by the.........a) value of the voltage supplied to the motor b) the number of stator poles per phase c) the frequency of the AC voltage coming offthe converter d) "b" and "c", not "a"arrow_forward
- Explain the characteristics and how the following motor starters work. 1.Slip Ring a. Variable Resistance b. Fixed Starting Resistancearrow_forwardWhat are the different maintenance that need to conduct on the GENERATOR and explain. a. Breakdown Maintenance b. Preventive Maintenance c. Condition Monitoringarrow_forwardWhat is three point starter ? What is four point starter? What is the nessecity of starter...!arrow_forward
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