Recent questions tagged machine

asked Jan 3 by anonymous

Explain the basic parts of a slotting machine with neat sketch.

Last answer: Base or Bed The base is rigidly built to take up all the cutting forces and the entire load of the machine. The top of the bed is accurately finished to provide guideways on which ... return mechanism. 2. Variable speed reversible motor drive mechanism. 3. Hydraulic drive mechanism.

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asked Jan 2 by anonymous

Write down the basic parts of a lathe machine with their proper functions.

Last answer: Important Parts of Lathe and their Functions 1. Bed It is the main body of the machine. All main components are bolted on it. It is usually made by cast iron due to its high compressive strength and ... carriage on bed. 12. Spindle: It is the main part of lathe which holds and rotates the chuck.

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asked Jan 2 by anonymous

Write down the steps involved for internal thread cutting on lathe machine.

Last answer: Steps involved for internal thread cutting on lathe machine 1) Hole is first bored to the root diameter of the thread. 2) Tool is fixed on the tool post or on the boring bar adjusted the angle of ... the start. 10) Keep going until the calculated depth of cut has been reached on the top slide.

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asked May 7, 2020 by anonymous

Types of slotting machine

Last answer: 1. Puncher slotter 2. Precision slotter 3. Production slotter Working Principle of Slotting machine:- The slotting machine is a reciprocating machine tool in which, The vertical slide holding the cutting ... longitudinal and cross feeds, a rotary feed motion is also provided in the work table.

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asked May 7, 2020 by anonymous

Define Feed and speed in shaping machine

Last answer: 1) Feed: Feed (S) is the relative movement of the work or tool in a direction perpendicular to the axis of reciprocation of the ram per double stroke. It is expressed in mm per stroke. 2) Speed: ... speed is the speed at which the metal is removed by the cutting tool in a period of one minute.

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asked Apr 27, 2020 by anonymous

Why poles of dc machine are laminated?

Last answer: Poles of DC machines are laminated to reduce the eddy current losses in the poles.

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asked Nov 13, 2019 by Purushotham

Losses in dc machine..?

Last answer: Copper losses,iron losses,variable losses , constant losees

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154 views 1 answer

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asked Sep 2, 2019 by anonymous

Electrical specifications with values for washing machine.

Last answer: 1. Type: Top loading / Front loading type 2. Capacity range: 6kg to 15kg 3. Motor Used: Induction motor 4. Input voltage: 100V- 240V 5. Power: in 1200W / Output power 100–400W{can go upto 1000W) 6. Efficiency: Max efficiency 31% 7. Wattage: 2.100-2.400 W 8. Current: 13A 9. Frequency: 50hz

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asked Sep 2, 2019 by anonymous

function of exposer in photocopier machine.

Last answer: A bright lamp illuminates the original document, and the whitws areas of the original document reflect the light onto the surface of the photoconductive drum. The areas of the drum that are exposed ... discharge to the ground. The areas of the drum not exposed to light remains negatively charged

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asked Aug 10, 2019 by anonymous

Draw block diagram for CNC drilling machine and explain its working.

Last answer: Block diagram consist of the following points: Machine tool with DC servo motor as feedback element. The transducer is added as adaptive control application. The auxiliary controller ... line. The interrupt pulses are generated by TBG and supplied to computer through inter

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274 views 1 answer

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asked Jul 27, 2019 by anonymous

Explain concept of back emf in DC machine. State how it governs armature current.

Last answer: Back emf: When the armature of DC machine rotates under the influence of driving torque, the armature conductors move in the magnetic field and cut it and hence emf is induced in them. The ... flow of armature current i.e. it automatically changes the armature current to meet load requirements.

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asked Aug 25, 2018 by Notes

UNIT 1 fundamentals of AC rotating machine

UNIT 1 fundamentals of AC rotating machine Contents 1.1 Introduction 1.2 Advantages 1.3 Parts of AC machines 1.4 Synchronous speed 1.5 AC winding 1.6 Winding factor (Coil pitch and distributed winding) 1.7 Distribution factor 1.8 EMF equation of alternator or generator 1.9 Numericals 1.10 Harmonic 1.11 Slot harmonics 1.12 Harmonics minimization

Last answer: 1.2 Advantages: In practices most of alternator have rotating magnetic field type construction with stationary armature due to following reason. The generation level of AC voltage may be in the range ... at high speed. Only two Slip rings are required to excited the field by AC supply.

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asked Jun 23, 2018 by Erdemuysal

The measured torque and torque reference of an induction machine are shown in Fig. 2.

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asked Jun 23, 2018 by Erdemuysal

Draw the stator voltage curves during the four different start-up methods shown in figure

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asked Jun 18, 2018 by anonymous

In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require

In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)? A) 4 to 6 B) 3 to 8 C) 2 to 3 D) 8 to 12

Last answer: In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)? A) 4 to 6 B) 3 to 8 C) 2 to 3 D) 8 to 12

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asked May 8, 2018 by anonymous

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Last answer: A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 0.87

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asked May 3, 2018 by anonymous

A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and

A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively

Last answer: A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively 19,17

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270 views 1 answer

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asked May 1, 2018 by anonymous

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation,

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator

Last answer: In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator

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310 views 1 answer

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asked Apr 30, 2018 by anonymous

The 'Equal area criterion' for the determination of transient stability of a synchronous machine connected to

The 'Equal area criterion' for the determination of transient stability of a synchronous machine connected to an infinite bus (1) ignores line as well as synchronous machine resistance and shunt capacitances. (2) assumes accelerating power acting on the rotor as constant. (3) ignores the effect of voltage ... inherent damping present in the machine. (4) takes into consideration the possibility of machine losing synchronism after it has survived during the first swing.

Last answer: 1

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asked Apr 29, 2018 by anonymous

The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)

The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents

Last answer: The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only

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asked Apr 29, 2018 by anonymous

The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors

The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is (1) 1000V (2) 100V (3) 600V (4) 10,000V

Last answer: The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is 1000V

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asked Apr 29, 2018 by anonymous

Aluminium is not used as winding wire for the armature of a dc machine because

Aluminium is not used as winding wire for the armature of a dc machine because (1) aluminium has low resistivity (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

Last answer: Aluminium is not used as winding wire for the armature of a dc machine because (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

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asked Apr 29, 2018 by anonymous

In a dc machine, interpoles are used to

In a dc machine, interpoles are used to (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction

Last answer: In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region

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asked Apr 29, 2018 by anonymous

During a disturbance on a synchronous machine, the rotor swings form A to B before finally setting down to

During a disturbance on a synchronous machine, the rotor swings form A to B before finally setting down to steady state at point C on the power angle curve. The speed of the machine during oscillation is synchronous at point(s)

Last answer: During a disturbance on a synchronous machine, the rotor swings form A to B before finally setting down to steady state at point C on the power angle curve. The speed of the machine during oscillation is synchronous at point(s) only at C

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asked Apr 28, 2018 by anonymous

Torque angle for the synchronous machine is the angle between

Torque angle for the synchronous machine is the angle between (A) stator magnetic field and rotor magnetic field (B) stator magnetic field and net magnetic field in the air gap (C) rotor magnetic field and net magnetic field in the air gap (D) excitation voltage and impedance voltage drop

Last answer: Torque angle for the synchronous machine is the angle between rotor magnetic field and net magnetic field in the air gap

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asked Apr 28, 2018 by anonymous

The magnetic neutral plane shifts in a dc machine

The magnetic neutral plane shifts in a dc machine (A) in the direction of motion of motor (B) in the direction of motion of generator (C) due to increase in the field flux (D) cause reduction of flash over between commutator segments

Last answer: The magnetic neutral plane shifts in a dc machine in the direction of motion of generator

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asked Mar 21, 2018 by anonymous

In a D.C. machine stray loss is the sum of?

Last answer: In a D.C. machine stray loss is the sum of iron loss and mechanical loss.

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asked Mar 21, 2018 by anonymous

In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilised is called?

Last answer: In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilised is called armature.

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asked Mar 21, 2018 by anonymous

To avoid formation of grooves in the commutator of a D.C. machine?

Last answer: 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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2.9k views 1 answer

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