Air friction damping is used in a/an _______ instrument.

1.	Air friction damping is used in a/an _______ instrument.
A.	Hot wire
B.	Induction
C.	Moving iron
D.	Moving coil
Answer» D. Moving coil

Discussion

No Comment Found

Related MCQs

A current of -4 + 3√2 sin (ωt + 30°) A is passed through a centre zero PMMC meter and moving-iron meter. The two meters will read respectively
In a moving iron instrument, the deflecting torque is:
A 0-1 Ampere moving iron ammeter has an internal resistance of 50 mΩ and inductance of 0.1 mH. A shunt coil is connected to extend its range to 0-10 Ampere for all operating frequencies. The time constant in milliseconds and resistance in mΩ of the shunt coil respectively are
Calculate the reading of voltmeter when 110 V 50 Hz is supplied across PMMC voltmeter having internal resistance 10 kΩ and full-scale range of 0-220 V.
In an ammeter, The deflecting torque is proportional to the current passing through it, and the instrument has full scale deflection of 80° for a current of 5 A. What deflection will occur for a current of 2.5 A when the instrument is spring-controlled?
Direction: It consists of two statements, one labeled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): In an ac dynamometer-type wattmeter the instantaneous value of developed deflecting torque is proportional to the product of voltage and current in the respective coils at the corresponding instant, the constant of proportionality is the same as in the case of dc use.Statement (II): The moving system of the meter is prevented by its Inertia from following the variations in the deflecting torque which takes place during each cycle, and takes up a position corresponding to the average value of the torque.
A periodic waveform observed across a load is represented by\(V\left( t \right) = \left\{ {\begin{array}{*{20}{c}}{1 + \sin \omega t,\;\;0 \le \omega t < 6\pi }\\{ - 1 + \sin \omega t,\;\;6\pi \le \omega t < 12\pi }\end{array}} \right.\)The measured value, using moving iron voltmeter connected across the load, is
_______ instruments give the value of measurand in terms of instrument constant and its deflection.
Based on which principle does a Moving Coil meter work?
Highest flux density exists inside which of the following instruments?

Air friction damping is used in a/an _______ instrument.

Discussion

No Comment Found

Related MCQs

Reply to Comment