Enlist the types of dc machines?

Enlist the types of dc machines?
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Answer :

Answer: D.C. machines are classified into two types 1) separately excited 2) self excited which is further classified into 1)series 2)shunt and 3)compound(which is further classified into cumulative and differential).
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Enlist types of dc generator?

Description : Enlist types of dc generator?

Last Answer : D.C. Generators are classified into two types 1) Separately excited d.c. generator 2) Self excited d.c. generator, which is further classified into; 1) Series 2) Shunt and 3) Compound (which is further classified into cumulative and differential).

Which of the listed conditions might contribute to very rapid wearing of a DC machine's commutator bars? A. A grounded commutator bar B. Using improper carbon brushes C. Aligning the front and rear mica V-rings improperly D. An open circuit in the armature

Description : Which of the listed conditions might contribute to very rapid wearing of a DC machine's commutator bars? A. A grounded commutator bar B. Using improper carbon brushes C. Aligning the front and rear mica V-rings improperly D. An open circuit in the armature

Last Answer : Answer: B

Which of the methods listed is used to maintain the division of load between two compound-wound, DC generators operating in parallel? A. The shunt fields are interconnected. B. The shunt field rheostats are interconnected. C. The series fields of both generators are connected in series. D. The equalizer connection parallels the series fields of all machines.

Description : Which of the methods listed is used to maintain the division of load between two compound-wound, DC generators operating in parallel? A. The shunt fields are interconnected. B. The shunt ... generators are connected in series. D. The equalizer connection parallels the series fields of all machines.

Last Answer : Answer: D

Why Does Curving The Pole Faces In A Dc Machines Contributes To A Smoother Dc Output Voltage From It?

Description : Why Does Curving The Pole Faces In A Dc Machines Contributes To A Smoother Dc Output Voltage From It?

Last Answer : For having smoother output voltage from DC machines its commutation must be as ideal as possible. In order to have good commutation the flux density in the air gap must decrease gradually from maximum value under the center of the pole to zero on.

What is the minimum recommended absorption coefficient value for AC and DC rotating machines?

Description : What is the minimum recommended absorption coefficient value for AC and DC rotating machines? 

Last Answer : Tips:  a. IR value decreases some what with an increase I applied voltage. However for machines in good condition substantially the same IR is obtained for any test voltage ... a value which after correction for temperature, may be compared with the recommended minimum value of IR. 

What are the minimum recommended PI values for AC and DC rotating machines?

Description : What are the minimum recommended PI values for AC and DC rotating machines? 

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What are the different types of DC machines?

Last Answer : Dc machine is classified as   self excited  separately excited  permanent magnet  Self excited Dc motor is further classified as  series ... are classified as  long shunt short shunt

Name the different types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Description : Name the different types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Last Answer : A: Following motors are used: - Vacuum cleaners- Universal motor. Phonographic appliances - Hysteresis motor. Vending machines - Shaded pole motor. Refrigerators - Capacitor split phase ... Cumulative motors. Lathes - DC shunt motors. Power factor improvement - Synchronous motors.

Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Description : Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

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Fractional pitch windings are used in DC machines to

Description : Fractional pitch windings are used in DC machines to (A) Reduce copper losses (B) Improve cooling (C) Increase the generated emf (D) Reduce sparking

Last Answer : Fractional pitch windings are used in DC machines to Reduce sparking

In dc machines, the armature windings are placed on the rotor because of the necessity for

Description : In dc machines, the armature windings are placed on the rotor because of the necessity for  (1) electromechanical energy conversion (2) generation of voltage (3) commutation (4) development of torque

Last Answer : 3  Commutation

The introduction of interpoles in between the main poles improves the performance of DC machines because:

Description : The introduction of interpoles in between the main poles improves the performance of DC machines because: (A) the interpole produces additional flux to augment the torque developed (B) the flux waveform ... of the armature is removed (D) a counter emf is induced in the coil undergoing commutation

Last Answer : The introduction of interpoles in between the main poles improves the performance of DC machines because: a counter emf is induced in the coil undergoing commutation

What are the different braking of DC machines?

Last Answer : Dynamic or rheostatic braking,plugging and regenerative braking

Which of the following types of DC motors has its field connected in parallel with its armature? A. Counter EMF B. Shunt C. Salient pole D. Series

Description : Which of the following types of DC motors has its field connected in parallel with its armature? A. Counter EMF B. Shunt C. Salient pole D. Series

Last Answer : Answer: B

How many types of DC motors are there?

Description : How many types of DC motors are there?

Last Answer : DC shunt motor: shunt motor speed varies slightly from no load to full load. DC series motor: series motor speed varies greatly as load changes. DC compound motor: the compound motor ... characteristics provided by the series field, while the shunt field provides for a relatively constant speed. 

What are the types of DC motor starter?

Description : What are the types of DC motor starter?

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What are main types of DC generator?

Description : What are main types of DC generator? 

Last Answer : Mainly there are three types. a. Series generator or series wound generator. b. Shunt generator or shunt wound generator. c. Compound generator. There are different types of compound generator. ... a. Under compound generator. b. Flat or level compound generator. c. Over compound generator. 

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Description : Enlist different types of protozoa.

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Description : Enlist the different types of Accidents.

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Define shoring. Enlist types of shoring. Explain any one type with neat sketch.

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Enlist different types of staircase. Explain any one type with a neat sketch.

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Enlist types of joints used in robotic arm and draw sketch of any two

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What is polymorphism? Enlist different types of polymorphism. What are the differences between them?

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Description : Define polymorphism. Enlist its types.

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Enlist types of operating system. Explain multiprogramming OS in detail.

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Description : Enlist different types of computer networks on the basis of their geography. 

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Enlist the types of shapers.

Description : Enlist the types of shapers.

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Enlist types of weir and explain any one in detail.

Description : Enlist types of weir and explain any one in detail.

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Enlist the types of gates provided to reservoir.

Description : Enlist the types of gates provided to reservoir.

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Define Spillway and Enlist types of spillway

Description : Define Spillway and Enlist types of spillway

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Enlist different types of database users.

Description : Enlist different types of database users.

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Enlist types of electrical wiring systems. Explain casing and capping type wiring system.

Description : Enlist types of electrical wiring systems. Explain casing and capping type wiring system.

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Description : Enlist any four types of enclosures with their applications. 

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One of the generator or motor bearings is generally insulated from the end housing in order to prevent ________. A. rapid brush wear B. current leakage from the shaft C. excessive field winding heat D. circulation of shaft currents induced in the machine's frame

Description : One of the generator or motor bearings is generally insulated from the end housing in order to prevent ________. A. rapid brush wear B. current leakage from the shaft C. excessive field winding heat D. circulation of shaft currents induced in the machine's frame

Last Answer : Answer: D