Direct Current Machine Or DC Machine Objective Questions and Answers 1 Poles of a DC machine are often laminated to 2 Pole shoe of a DC machine is laminated for the purpose of D None of the above A The current and EMF in armature conductors are alternating while those at the terminals are unidirectional...
Apr 28, 2016· In case when the dc machine fails to build up the voltage due to lack of residual magnetism, filed coils are connected to the dc source (battery) for short while for magnetizing the filed pol Application of external source of direct current to the field of the dc machine is called field flashing , Transformers Questions & Answers Part-1 ....
Question 3 A DC electric motor spinning at 4500 RPM draws 3 amps of current with 110 volts measured at its terminals The resistance of the armature windings, measured with an ohmmeter when the motor is at rest, unpowered, is 245 ohms How much counter-EMF is the motor generating at 4500 RPM?...
Dec 01, 1995· In DC machines, both motors and generators, the armature is the rotor, and the field is the stator Because the armature is always the rotor on DC machines, many electricians and engineers mistakenly believe that the armature is the rotor on all motors and generators Question No 2: I have relieved the spring tension on my brushes, and they ....
A 220V dc machine supplies 20A at 200 V as a generator The armature resistance is 02 If the machine is now operated as a motor as a same terminal voltage and current but with flux increased by 10%, the ratio of motor speed to generator speed is...
Question 8 of 15 8 Question 1 points The direction of rotation of dc series motor can be reversed by interchanging ___ terminals: 1 Either Armature or Field 2 Field...
Q2) A series-connected DC machine has a combined field and armature resistance of 1 Before the machine leaves the factory, it is tested as a DC generator During the test, the machine rotates at 500 RPM and the following current-voltage (at the machine terminals) characteristic is obtained: 10 la [A] Vt [V] 20 302 30 370 35 397 40 418 45 437 ....
Dec 12, 2011· DC Machines Objective test Questions 1 In DC Generator the critical resistance refers to: a) Armature b) Field c) Load d) Commutator Answer 2In DC Generator the residual magnetism will be of the order: a) 25% b) 10% c) 15% d) 20% Answer 3Sparkless commutation can be achieved by employing ....
Electrical Engineering questions and answers; Q4 The DC machine in Figure Q4 is interfaced to a DC bus Veus using the power converter shown The power converter is bidirectional, and the machine can act as a motor or generator When the machine is acting as a generator it feeds 4 kW back into Vous which is set at 325 V...
Jul 26, 2021· The machine is connected to 600 V DC source The rotational loss is 32 kW If the machine draws a 100 A from the supply, calculate a Back EMF b Determine the machine’s converted power (or developed power) and its efficiency c Determine the speed regulation if the machine draws 165 A at full load...
Bookmark File PDF Dc Machine Objective Questions Answers Dc Machine Objective Questions Answers Getting the books dc machine objective questions answers now is not type of inspiring means You could not lonely going taking into consideration book hoard or library or borrowing from your associates to log on them This is an certainly easy means ....
SOLVED PROBLEMS ON DC MACHINE MAGNETIC CIRCUIT Example1 Calculate the ampere-turns turns for the air gap of a dc machine given the following data Gross core length = 40cm, air gap length = 05cm, number of ducts = 5, width of duct = 10cm, slot pitch = 65cm, slot opening = 05cm, average value of flux density in the air gap =063T...
If they are connected in series and 600V be Electrical Engineering Basics applied across them, the readings are Objective Questions with Answers: (a) 360V and 240V Part-17 (b) 300V each (c) 400V and 200V DC Machine Multiple Choice Questions with Solutions: Part-12 (d) one of the meters out of the range and other 100V 3 Phase Induction Motors ....
9) The armature conductors of 6-pole, lap wound dc generator are divided into a) 2 parallel paths b) 4 parallel paths c) 3 parallel paths d) 6 parallel paths...
Jul 26, 2021· The machine is connected to 600 V DC source The rotational loss is 32 kW If the machine draws a 100 A from the supply, calculate a Back EMF b Determine the machine’s converted power (or developed power) and its efficiency c Determine the speed regulation if the machine draws 165 A at full load...
Oct 06, 2020· Answer 4 Starter for car Explanation: In DC series motor Torque (Ta) increases as the Square of armature current (Ia) T a ∝ I a 2 So DC motor provides high starting torque which is required to start a car Ques 9 In the DC machine, the fractional pitch winding is used...
Oct 06, 2020· Explore the latest questions and answers in DC Machines, and find DC Machines experts Questions (88) Publications (4,343) Questions related to DC Machin Hadeel Al-zuheri...
Electric Motors are the machines that convert electrical energy into the mechanical energy which further is used to drive a vehicle, plant and many more things around us Here are the types of questions on electric motors which are asked in an interview, question papers and other competitive exams as well , A DC motor is a mechanically ....
Jan 30, 2020· Correct answer: 2 It produces gradual degradation More MCQ on DC Machines: Generally the preferred DC Motor for cranes and hoists is The approximate thickness of laminations of a DC machine is Usually, the field coils of DC generator are made from...
SOLVED PROBLEMS ON DC MACHINE MAGNETIC CIRCUIT Example1 Calculate the ampere-turns turns for the air gap of a dc machine given the following data Gross core length = 40cm, air gap length = 05cm, number of ducts = 5, width of duct = 10cm, slot pitch = 65cm, slot opening = 05cm, average value of flux density in the air gap =063T...
DC Motor or Direct Current Motor Multiple Choice Questions and Answers 21 In a DC motor, unidirectional torque is produced with the help of , A Brushes B Commutator C End-plates D...
The terminal voltage of a dc generator can be kept constant by compounding the generator >In a compound generator both series and shunt winding are placed on each field pole The series winding is so connected in that the flux produced by it aids the flux produced by shunt winding , 1 thought on “Electrical Machines Questions and Answers...
This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “DC Motor Basics -1” 1 What will happen if DC shunt motor is connected across AC supply? a) Will run at normal speed b) Will not run c) Will Run at lower speed d) Burn due to heat produced in the field winding View Answer...
Electrical Engineering and Instrumentation - DC Machines - Solved Problems: Electrical Engineering and Instrumentation - DC Machin PROBLEMS A 4 pole generator with wave wound armature has 51 slots each having 24 conductors The flux per pole is 10 mWb At what speed must the armature rotate to give an induced emf of 024 kV...
II Demonstrate the working principle of different types of dc machines and transformers III Analyze the losses in dc machines to improve the efficiency by conducting various tests IV Outline the principle of operation, construction and testing of single phase transformers UNIT-I...
300+ TOP Single Phase Induction Motors Multiple Choice Questions & Answers ; 250+ TOP MCQs on Operating Characteristics of DC Compound Motor – 1 and Answers ; 130 TOP DCMOTOR Questions and Answers pdf ; 130 TOP DC MOTOR Objective Questions Answers pdf free Download ; 250+ TOP MCQs on Braking of DC Motors – 2 and Answers...
Answer any 5 questions from the given 7questions 3 Section–B: Long/Essay type questions of 5 marks each Answer any 1 question from the given 2 questions 4 All questions of a particular section must be attempted in the correctorder 5 Please check that this question paper contains 28 questions out of which 21 questions are to be ....
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A compound wound DC machine is said to be differentially compounded when the flux due to the shunt field winding diminishes the effect of the main series winding This particular trait is not really desirable, and hence does not find much of a practical application...
Jul 26, 2021· The machine is connected to 600 V DC source The rotational loss is 32 kW If the machine draws a 100 A from the supply, calculate a Back EMF b Determine the machine’s converted power (or developed power) and its efficiency c Determine the speed regulation if the machine draws 165 A at full load...