The disc of an instrument using eddy current damping should be of?

by

1 Answer

Answer :

The disc of an instrument using eddy current damping should be of conducting and non-magnetic material.

by

Related questions

Eddy current damping cannot be used for moving iron instrument because

Description : Eddy current damping cannot be used for moving iron instrument because

Last Answer : Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument

In a PMMC instrument, the damping provided is :

Description : In a PMMC instrument, the damping provided is :  (A) air damping (C) eddy current damping (B) fluid damping (D) magnetic damping using a magnet

Last Answer : In a PMMC instrument, the damping provided is : eddy current damping 

Give two applications of each : 1) Eddy current sensor 2) Optical sensor.

Description : Give two applications of each : 1) Eddy current sensor 2) Optical sensor.

Last Answer : Eddy current sensor : 1. Detection of non-magnetic but conductive materials. 2. Displacement sensing 3. Position sensing Optical sensor : 1. Position Detection 2. Velocity Detection 3. Acceleration Detection 4. Direction Detection

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.

Description : The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

Last Answer : The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W

Which of the following can reduce the Eddy current losses?

Description : Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

Last Answer : Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

A ferrite core has less eddy current loss than an iron core because?

Description : A ferrite core has less eddy current loss than an iron core because?

Last Answer : A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.

What is the difference between eddy current and hysteresis loss?

Description : What is the difference between eddy current and hysteresis loss?

Last Answer : Loss occurred by magnetising and demagnetising process is called histerisis loss and the current flowed due to the magnetic field produced by the electric field applied is called eddy current losses

Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

Description : Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

Last Answer : Hysteresis loss: Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss ... loss in transformer is given by, We=Kef2Kf2Bm2watts Skin effect limitations:

what is eddy current ?

Description : what is eddy current ?

Last Answer : In magnetic circuits when we supply current to coil which wound on some core( of iron cast iron, ferrite ) material it produce magnetic field but there is small amount of flux which also ... heat and losses in magnetic circuits..for good working conditions we always try to minimize eddy current

The gravity controlled instrument has crowded scale because current is proportional to?

Last Answer : The gravity controlled instrument has crowded scale because current is proportional to sine of deflection angle.

Find current through resistor using nodal analysis

Description : Find current through resistor using nodal analysis

Last Answer : Find current through resistor using nodal analysis

An instrument which detects electric current is known as?

Description : An instrument which detects electric current is known as?

Last Answer : An instrument which detects electric current is known as galvanometer.

A control system having unit damping factor will give

Description : A control system having unit damping factor will give  (1) Oscillatory response (2) Undamped response (3) Critically damped response (4) No response

Last Answer : 1

Ideally, the damping torque should be

Description : Ideally, the damping torque should be  (1) Proportional to velocity of the moving system and operating current.  (2) Proportional to the velocity of the moving system but independent of operating ... operating current.  (4) Independent of the velocity of the moving system and operating current.

Last Answer : Ideally, the damping torque should be Proportional to the velocity of the moving system but independent of operating current. 

Damping of the Ballistic galvanometer is made small to?

Last Answer : Damping of the Ballistic galvanometer is made small to get first deflection large.

In majority of instruments damping is provided by?

Last Answer : In the majority of instruments, damping is provided by eddy currents.

Caliper Disc Brake

Description : Caliper Disc Brake

Last Answer : The caliper disc brake is a device for stopping or slowing the spinning of a wheel. To be able to do this, friction is applied in the form of brake pads. These brake pads are mounted in a brake ... that clamp on each side of the disc. It is more expensive and more complex than a floating caliper.

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is

Description : The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is (A) 1.2 kW (B) 1 kW (C) 600 W (D) 500 W

Last Answer : The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is 500 W

Eddy currents are induced in the pole shoes of a D.C. machine due to?

Description : Eddy currents are induced in the pole shoes of a D.C. machine due to?

Last Answer : Eddy currents are induced in the pole shoes of a D.C. machine due to relative rotation between field and armature.

A moving-coil permanent-magnet instrument can be used as what by using a low resistance shunt?

Last Answer : A moving-coil permanent-magnet instrument can be used as ammeter by using a low resistance shunt.

List the different methods to produce damping torque.

Description : List the different methods to produce damping torque.

Last Answer : Methods of providing damping torque in indicating type instruments: 1) Air friction damping. 2) Fluid friction damping. 3) Eddy current damping.

Describe with neat diagram air friction damping.

Description : Describe with neat diagram air friction damping. 

Last Answer : Air Friction Damping: Here air trapped in the chamber works as damping medium for the piston movement connected to the spindle. The piston moves in the air chamber. The clearance between piston and ... will be the damping torque, bringing the pointer to the equilibrium position quickly. 

Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is

Description : Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is

Last Answer : Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is 16

The damping factor of a particular system is unity, the system response will be

Description : The damping factor of a particular system is unity, the system response will be

Last Answer : The damping factor of a particular system is unity, the system response will be critically damped

The damping winding in synchronous motor is generally used to?

Description : The damping winding in synchronous motor is generally used to?

Last Answer : The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

A Pyrheliometer is an instrument to measure :

Description : A Pyrheliometer is an instrument to measure :  (A) temperature of solar photovoltaic cell  (B) intensity of direct solar radiation at normal incidence  (C) intensity of indirect solar radiation  (D) efficiency of a solar photovoltaic cell

Last Answer : A Pyrheliometer is an instrument to measure : intensity of direct solar radiation at normal incidence 

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an

Description : A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω

Last Answer : A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is 1.001 Ω

Identify the instrument that does not exist (A) Dynamo-meter type ammeter (B) Dynamo-meter type

Description : Identify the instrument that does not exist (A) Dynamo-meter type ammeter (B) Dynamo-meter type wattmeter (C) Moving-iron voltmeter (D) Moving-iron wattmeter

Last Answer : Identify the instrument that does not exist (A) Dynamo-meter type ammeter (B) Dynamo-meter type wattmeter (C) Moving-iron voltmeter (D) Moving-iron wattmeter

Instrument transformers are?

Last Answer : Instrument transformers are potential transformers, current transformers.

The rectifier instrument is not free from?

Last Answer : The rectifier instrument is not free from frequency error.

A multirange instrument has?

Last Answer : A multirange instrument has multiple shunt or series resistances inside the meter.

If an instrument has cramped scale for larger values, then it follows?

Last Answer : If an instrument has cramped scale for larger values, then it follows logarithmic law.

The ratio of maximum displacement deviation to full scale deviation of the instrument is called?

Description : The ratio of maximum displacement deviation to full scale deviation of the instrument is called?

Last Answer : The ratio of maximum displacement deviation to full scale deviation of the instrument is called linearity.

The scale of a rectifier instrument is?

Last Answer : The scale of a rectifier instrument is linear.

A moving iron instrument can be used for?

Last Answer : A moving iron instrument can be used for both D.C. and A.C.

In a portable instrument, the controlling torque is provided by?

Last Answer : In a portable instrument, the controlling torque is provided by spring.

The pointer of an indicating instrument should be?

Last Answer : The pointer of an indicating instrument should be very light.

Which is an instrument which measures insulation resistance of an electric circuit relative to earth and one another?

Last Answer : Meggar is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another.

A moving-coil permanent-magnet instrument can be used as flux-meter?

Last Answer : A moving-coil permanent-magnet instrument can be used as flux-meter by eliminating the control springs.

Draw & explain touch plate switch using IC555.

Description : Draw & explain touch plate switch using IC555.

Last Answer : It is construct form monostable multivibrator , when metal plates touch by finger then voltage at pin number 2 goes to below 1/3 Vcc then output of lower comparator becomes high hence flip flop set and ... then output of timer goes low and it low till up to the metal plates touch by finger .

Sinusoidal Steady-State Analysis - Using nodal analysis, find node voltages in the circuit.

Description : Sinusoidal Steady-State Analysis - Using nodal analysis, find node voltages in the circuit.

Last Answer : Sinusoidal Steady-State Analysis - Using nodal analysis, find node voltages in the circuit.

A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

Description : A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

Last Answer : A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

Using phasors, determine in the following equations

Description : Using phasors, determine in the following equations

Last Answer : Using phasors, determine in the following equations

Logic Simplification Using Boolean Algebra

Description : Logic Simplification Using Boolean Algebra

Last Answer : Logic Simplification Using Boolean Algebra 1 : https://youtu.be/fuoSMm2dJMc Logic Simplification Using Boolean Algebra 2 : https://youtu.be/bfCdur2QcJ4 Logic Simplification Using Boolean Algebra 3 : ... .be/V02wz8gz1UU Logic Simplification Using Boolean Algebra 7 : https://youtu.be/rgnJKgFO-SU

Build using minimum number of CMOS gates.

Description : 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

Last Answer : Three input NAND gate. Two input NOR gate Three input NOR gate Two input AND gate Two input OR gate

The speed of a universal motor is generally reduced by using?

Last Answer : The speed of a universal motor is generally reduced by using gear trains.

What are the advantages of using Linux?

Description : What are the advantages of using Linux?

Last Answer : Advantages of Linux are as follows :Linux is open source and free.Linux Is multiuser and multitasking operating system.Linux is the stable operating system.Linux is reliable.Linux can be modify according to requirements.Linux is the secure operating system.

can we turn off thyristor using Gate?

Last Answer : No we cannot turn off normal thyristor using Gate.

State the advantages of instrument transformer in using for extension of range of meters.

Description : State the advantages of instrument transformer in using for extension of range of meters. 

Last Answer : Advantages of instrument transformer: 1. Extension of instrument range is possible. 2. Isolation of instruments from high voltage side. 3. Power loss is less as compared to shunts and multipliers. 4 ... measurement. 5. It is economical method of range extension. 6. Increases in safety of operator.

What are the test and measuring instrument required in an Electrical depots?

Description : What are the test and measuring instrument required in an Electrical depots?

Last Answer : Ans. Following are the test and measuring instruments required in an Electrical depots. a. Test lamp b. Line Tester c. Continuity tester d. Volt meter e. Ammeter f. Earth megger g. Megger h. Lux meter i. Power analyzer j. Infrared thermometer