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The number of brushes in a commutator depends on amount of current to be collected.

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Answer :

The material for commutator brushes is generally carbon.

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In lap winding, the number of brushes is always same as the number of poles.

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Copper brushes in D.C. machine are used where low voltage and high currents are involved.

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The rapid wear of brushes takes place due to abrasion from dust, excessive spring pressure, rough commutator bars, high mica insulation between com-mutation bars.

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Armature coil is short circuited by brushes when it lies along neutral axis.

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Brushes of D.C. machines are made of carbon.

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To avoid formation of grooves in the commutator of a D.C. machine the brushes of opposite polarity should track each other.

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Answer :

In a commutator mica is harder than copper.

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Answer :

The insulating material used between the commutator segments is normally mica.

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Description :

Number of commutator bars for a 4-pole, 2-layer, DC lap winding with 24 slots and one conductor per layer is (A) 48 (B) 24 (C) 192 (D) 96

Answer :

Number of commutator bars for a 4-pole, 2-layer, DC lap winding with 24 slots and one conductor per layer is 24

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Description :

In a DC motor, it is important to place the brushes along ______ A) Magnetic Neutral Axis B) Normal Geometric Axis C) Nominal Geometric Axis D) None of these

Answer :

In a DC motor, it is important to place the brushes along Magnetic Neutral Axis

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Description :

Brushes of DC machine are made up of ?

Answer :

Brushes of DC machine are made up of carbon.

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Description :

The function of a brush and commutator arrangement in a dc motor is to  (1) produce unidirectional torque (2) produce unidirectional current in the armature (3) help in changing the direction of rotation of the armature (4) reduce sparking

Answer :

The function of a brush and commutator arrangement in a dc motor is to produce unidirectional torque

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Description :

Answer :

Sparking at the commutator of a D.C. motor may result in damage to commutator segments, damage to commutator insulation, increased power consumption.

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Description :

Answer :

In a A.C. series motor armature coils are usually connected to commutator through resistance.

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Description :

State the function of commutator in DC generator and name the material used for commutator.

Answer :

Function of Commutator: Commutator converts AC induced in armature winding into DC for external load. Material: i) Commutator segments are made up of Copper. ii) Commutator segments are insulated from each other by Mica.

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Description :

Which of the following does not have a commutator? A) Dynamo B) Induction motor C) Universal motor D) None of these

Answer :

Which of the following does not have a commutator? A) Dynamo B) Induction motor C) Universal motor D) None of these

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Description :

Answer :

In D.C. generators, the brushes on commutator remain in contact with conductors which lie under interpolar region.

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Increasing the number of turns of wire on the secondary of a transformer will  (A) Decrease the secondary current (B) Increase the primary current (C) Have no effect on the secondary current (D) Increase the secondary current

Answer :

Increasing the number of turns of wire on the secondary of a transformer will Decrease the secondary current 

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A number of forces acting at a point will be in equilibrium if?

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A number of forces acting at a point will be in equilibrium if sum of resolved parts in any two per-pendicular directions are both zero.

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What is the maximum number of circuit breakers in a panel?

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It depends on that which type of panel is this.

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What is the choice of size and number of generator units in interconnected power system?

Answer :

Choice of Size and Number of Generating Units: 1. The size/rating and number of generating units in such way that they approximately match with the load curve as closely as possible. 2. In ... , if power plant is connected to grid system then generating unit of higher capacity can be installed.

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Then number of T-states of the instruction STA in 8085 microprocessor is A) 10 B) 12 C) 13 D) 16 

Answer :

Then number of T-states of the instruction STA in 8085 microprocessor is 13 

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The number of terminals present in IGBT is A) 2 B) 3 C) 4 D) 5

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The number of terminals present in IGBT is 3

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The number of electrons in the outer most orbit of carbon atom is?

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The number of electrons in the outer most orbit of carbon atom is 4.

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What are the number of valence electrons of atoms in semiconductor?

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There are four valence electrons in the atom of a semiconductor.

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 The number of loop equations required to completely analysing a network comprising of 8 independent branches and 6 nodes including the reference node shall be A) 3 B) 2 C) 4 D) 5 

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 The number of loop equations required to completely analysing a network comprising of 8 independent branches and 6 nodes including the reference node shall be 3 

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 A connected graph has ‘5’ number of branches and ‘4’ number of nodes. It's rank is A) 1 B) 2 C) 3 D) 4 

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 A connected graph has ‘5’ number of branches and ‘4’ number of nodes. It's rank is 3 

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lt the length, number of turns and area of a coil are  doubled, the inductance of the coil

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lt the length, number of turns and area of a coil are  doubled, the inductance of the coil is quadrupled

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The number of independent equations to solve a network is equal to?

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The number of independent equations to solve a network is equal to the number of chords.

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What is the Gray code word for the binary number 101011?  (1) 101011 (2) 110101 (3) 011111 (4) 111110

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What is the Gray code word for the binary number 101011?  (1) 101011 (2) 110101 (3) 011111 (4) 111110

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The number of poles of 8/6 stepper motor can be :

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The number of poles of 8/6 stepper motor can be : 4

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Build using minimum number of CMOS gates. Three input NAND gate. Two input NOR gate Three input NOR gate Two input AND gate Two input OR gate

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Three input NAND gate. Two input NOR gate Three input NOR gate Two input AND gate Two input OR gate

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Answer :

In case of D.C. machine winding, number of commutator segments is equal to number of armature coils.

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In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will   (a) Improve but terminal voltage will fall   (b) Worsen and terminal voltage will fall   (c) Improve and terminal voltage will rise   (d) worsen and terminal voltage will rise 

Answer :

In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will Improve but terminal voltage will fall 

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Description :

Answer :

Commutator brushes are made up of carbon.

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Answer :

If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be crossmagnetisation as well as demagnetising.

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Answer :

The resistance of armature winding depends on length of conductor, cross-sectional area of the conductor, number of conductors.

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Answer :

The commutator segments are connected to the armature conductors by means of copper lugs.

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In the indexed scheme of blocks to a file, the maximum possible size of the file depends on: (A) The number of blocks used for index, and the size of index (B) Size of Blocks and size of Address (C) Size of Index (D) Size of Block

Answer :

(A) The number of blocks used for index, and the size of index

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If S1 is total number of modules defined in the program architecture, S3 is the number of modules whose correct function depends on prior processing then the number of modules not dependent on prior processing is: (A) 1 + S3/S1 (B) 1 - S3/S1 (C) 1 + S1/S3 (D) 1 - S1/S3

Answer :

(B) 1 - S3/S1

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The number of brushes in a 6-pole double-layer lap wound dc machine is (A) 8 (B) 6 (C) 4 (D) 2 

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The supply of labour in the market depends on (1) the proportion of the population in the labour force (2) the number of person hours put in by each person (3) the size of population (4) All the above

Answer :

All the above

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Description :

In a 6-pole wave wound dc machine the number of conductors is 70. The back pitch and commutator segments, respectively, are (A) 11and 35 (B) 12 and 34 (C) 13 and 35 (D) 14 and 34 

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A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments (1) is zero (2) depends on the total mass of all the fragments (3) depends on the speeds of various fragments (4) is infinity 

Answer :

is zero 

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The total magnetic moment  1. is called saturation magnetization.  2. depends on the number of magnetic dipoles per unit volume, the instant electric current and the area of the current loop.  Which of the above statements is/are correct ?

Answer :

depends on the number of magnetic dipoles per unit volume, the instant electric current and the area of the current loop

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Answer :

In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when number of poles is 2.

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Description :

The chemical bahaviour of an atom depends upon (1) the number of protons in its nucleus (2) the number of neutrons in the nucleus (3) the number of electrons orbiting around the nucleus (4) the number of nucleons in the nucleus

Answer :

the number of electrons orbiting around the nucleus

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Description :

For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?

Answer :

Wave winding

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103 views 1 answer
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