For the indicating instrument the preferred damping condition is

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Answer :

For the indicating instrument the preferred damping condition is  a damping coefficient of 0.8 to 1.

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Related questions

The damping torque must operate only when the moving system of the indicating instrument is:

Last Answer : The damping torque must operate only when the moving system of the indicating instrument is: Actually moving

A moving coil instrument is used as an ohmmeter. The indicating scale of the meter will be

Last Answer : A moving coil instrument is used as an ohmmeter. The indicating scale of the meter will be Hyperbolic.

The pointer of an indicating instrument should be?

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

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 

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

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

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

The force required to move the pointer in an indicating instruments is

Description : The force required to move the pointer in an indicating instruments is

Last Answer : The force required to move the pointer in an indicating instruments is deflecting force

Which of the following statements regarding the use of a current measuring instrument is correct? A. It must be connected in series with the circuit. B. You should always start with the lowest range until a suitable reading is obtained. C. The indicating needle is deflected from left to right regardless of polarity. D. An external shunt is generally utilized where current is less than 10 amperes.

Description : Which of the following statements regarding the use of a current measuring instrument is correct? A. It must be connected in series with the circuit. B. You should always start with the lowest range ... of polarity. D. An external shunt is generally utilized where current is less than 10 amperes.

Last Answer : Answer: A

The use of telecommunication for automatic indicating or recording measurement at the distance from the measuring instrument. A. Monitoring B. Tracking C. Telemetry D. Telecommand

Description : The use of telecommunication for automatic indicating or recording measurement at the distance from the measuring instrument. A. Monitoring B. Tracking C. Telemetry D. Telecommand

Last Answer : C. Telemetry

What are the essentials of indicating instrument?

Description : What are the essentials of indicating instrument?

Last Answer : a. Deflecting torque or force (effect of electricity). b. Controlling torque or force (spring control and gravity control). c. Damping torque or force (air friction, eddy current and fluid friction).

When both deflecting and controlling torque act, the pointer of an indicating instrument comes to

Description : When both deflecting and controlling torque act, the pointer of an indicating instrument comes to

Last Answer : rest

As the deflection of the moving system increases, the controlling torque in an indicating instrument.

Description : As the deflection of the moving system increases, the controlling torque in an indicating instrument.

Last Answer : increases

An indicating instrument whose movable coils rotate between two-stationary coils, usually used as wattmeter

Description : An indicating instrument whose movable coils rotate between two-stationary coils, usually used as wattmeter

Last Answer : electrodynamometer

A tunable RF instrument, which, by means of a sharp dip of an indicating meter, indicates resonance with an external circuit under test

Description : A tunable RF instrument, which, by means of a sharp dip of an indicating meter, indicates resonance with an external circuit under test

Last Answer : dip meter

If the pointer of an indicating instrument is in motion, then what opposes deflecting torque?

Description : If the pointer of an indicating instrument is in motion, then what opposes deflecting torque?

Last Answer : damping and controlling torque

What is the force acting on the pointer of an indicating instrument when it is in motion?

Description : What is the force acting on the pointer of an indicating instrument when it is in motion?

Last Answer : controlling, damping and deflecting torques

Indicating instrument is assumed to be most accurate at what part of the scale?

Description : Indicating instrument is assumed to be most accurate at what part of the scale?

Last Answer : at half or full

The pointer of an indicating instrument is generally made of

Description : The pointer of an indicating instrument is generally made of

Last Answer : aluminum

Eddy current damping is normally used in the instruments of

Description : Eddy current damping is normally used in the instruments of (a) Induction type (b) Moving iron type (c) Permanent magnet moving coil type (d) Nothing can be said 

Last Answer : Permanent  magnetic  moving  coil  instrument.

Control systems are generally designed with damping

Description : Control systems are generally designed with damping  a) less than one  b) greater than one c) equal to one d) with any value depending upon system requirement

Last Answer : Control systems are generally designed with damping  less than one 

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. 

In moving coil meters, damping is provided by

Last Answer : In moving coil meters, damping is provided by eddy current disk.

Air friction damping is used in the instruments which is:

Last Answer : Air friction damping is used in the instruments which is: Moving iron

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.

The most efficient form of damping in an instrument is

Last Answer : The most efficient form of damping in an instrument is Eddy current.

Preferred material for permanent magnet is:

Last Answer : Preferred material for permanent magnet is: Alnico

The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the

Description : The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are  A) Perpendicular B) Parallel C) Inclined at 60" D) Inclined at 30°

Last Answer : The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are Parallel 

In the case of an instrument reading of 8.3 V with a 0 to 150 voltmeter having a guaranteed accuracy of

Description :  In the case of an instrument reading of 8.3 V with a 0 to 150 voltmeter having a guaranteed accuracy of 1% full scale reading, the percentage limiting error is   (A) 1.810% (B) 0.181% (C)12.45% (D) 0.0018%

Last Answer :  In the case of an instrument reading of 8.3 V with a 0 to 150 voltmeter having a guaranteed accuracy of 1% full scale reading, the percentage limiting error is 12.45%

A moving coil instrument has a resistance of 10 W and gives full scale deflection when carrying

Description : A moving coil instrument has a resistance of 10 W and gives full scale deflection when carrying a current of 50 mA. To measure current upto 100 A, we will have to connect • 10 W resistance in series • 10 W resistance in parallel • 10/1999 W resistance in series • 10/1999 W resistance in parallel

Last Answer : A moving coil instrument has a resistance of 10 W and gives full scale deflection when carrying a current of 50 mA. To measure current upto 100 A, we will have to connect 10/1999 W resistance in parallel

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

Electrostatic instrument uses the principle of the variation of

Last Answer : Electrostatic instrument uses the principle of the variation of Capacitance with the voltage.

In a gravity controlled instrument, the deflection angle is proportional to

Last Answer :  In a gravity controlled instrument, the deflection angle is proportional to sine inverse of measurand.

In a moving coil instrument, the deflecting torque is proportional to

Last Answer :  In a moving coil instrument, the deflecting torque is proportional to Current.

The repeat accuracy of an instrument can be judged from its

Last Answer : The repeat accuracy of an instrument can be judged from its standard deviation of error.

If the instrument is to have a wide range, the instrument should have

Last Answer : If the instrument is to have a wide range, the instrument should have Logarithmic scale.

The error of an instrument is normally given as a percentage of

Last Answer : The error of an instrument is normally given as a percentage of full-scale value.

An instrument to be used for measurement and control should preferably have

Last Answer : An instrument to be used for measurement and control should preferably have Linear output and fast response

The sensitivity of an instrument is

Last Answer : The sensitivity of an instrument is ratio of the change in the magnitude of the output to the corresponding change in the magnitude of the input.

The percentage limiting error, in the case of an instrument reading ...

Description :  The percentage limiting error, in the case of an instrument reading of 8.3V with a 0 to 150V voltmeter having a guaranteed accuracy of 1% full-scale reading is

Last Answer :  The percentage limiting error, in the case of an instrument reading of 8.3V with a 0 to 150V voltmeter having a guaranteed accuracy of 1% full-scale reading is 18.10%.

An instrument transformer is used to extend the range of

Last Answer : An instrument transformer is used to extend the range of induction instrument.

The instrument having its deflection depends upon average value is:

Last Answer : The instrument having its deflection depends upon average value is:  Rectifier type

Megger is an instrument used for the measurement of:

Last Answer : Megger is an instrument used for the measurement of: High resistance and insulation resistance

An instrument that is capable of measuring only dc is:

Last Answer : An instrument that is capable of measuring only dc is: Moving coil

PMMC instrument gives uniform scale because:

Description : PMMC instrument gives uniform scale because:

Last Answer : PMMC instrument gives uniform scale because: It uses spring control and The deflection torque is proportional to the instrument current.

The reliability of the instrument refer to:

Last Answer : The reliability of the instrument refer to: Degree to which repeatability continues to remain within specified limits

The deflection of hot-wire instrument depends on:

Last Answer : The deflection of hot-wire instrument depends on: RMS value of the alternating current