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

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The moving system of an indicating type of electrical instrument is subjected to (a) a deflecting torque (b) a controlling torque (c) a damping torque (d) All of the above

asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 195 views
1 answer 19 views

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°

asked May 20, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 20 views

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

asked May 13, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 13 views

For a desirable transient response of a second order system, the damping ratio must be between (a) 0.4 and 0.8 (b) 0.8 and 1.0 (c) 0.3 and 0.5 (d) 0.2 and 0.4

asked May 25, 2018 in Control System by Shimroz123
0 answers 7 views

The deflecting torque of a moving coil instrument depends on (a) supply frequency (c) flux in the coil (b) inverse of area of coil (d) square of the voltage

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 26 views

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

asked Apr 29, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 32 views

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 current.  (3) Independent of the velocity of the moving system and proportional to the operating current.  (4) Independent of the velocity of the moving system and operating current.

asked Apr 30, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 11 views

Series resistance required to read 0-250 V with a moving coil instrument of internal resistance 2 ohm and full scale deflection of 50 mA is (a) 49998 Ω (b) 4998 Ω (c) 498 Ω (d) 49.8 Ω

asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 8 views

In a second order system the value of resonant peak will be unity when the damping ratio has a value of  A) Zero B) Unity C) 0.707 D) 0.414

asked Apr 9, 2018 in Control System by Shimroz123
0 answers 681 views

A motor load system is stable when the slope of the torque speed characteristics of the motor is (a) higher than the slope of the torque speed characteristics of the load (b) lower than the slope of the torque speed characteristics of the load (c) zero (d) none of the above

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 33 views

A 150 V moving iron voltmeter of accuracy class 1.0 reads 75 V when used in a circuit under a standard conditions. The maximum possible percentage error in the reading is:

asked Mar 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 30 views

For controlling the vibration of the disc of ac energy meter, damping torque is produced by

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 69 views

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

asked May 14, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 24 views

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

asked May 1, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 27 views

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 

asked May 25, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 33 views

The characteristic equation of a simple servo system is s2+6s+25=0. Damping factor of the system is: A) 3.2 B) 2.4 C) 1.8 D) 2.9

asked Jun 17, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

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

asked May 8, 2018 in Control System by Zeeshan
1 answer 17 views

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

asked Apr 26, 2018 in Control System by Shimroz123
1 answer 16 views

In the time response analysis of control system, Damping Ratio is given by - a) Actual damping / Critical damping b) Critical damping /Actual damping c) ( Sum of the Actual damping and critical damping) /Actual damping d)( Difference of the Actual damping and critical damping) / critical damping

asked Apr 14, 2018 in Instrumentation and control by Shimroz123
1 answer 18 views

A system is causal if the output of any time depends only on   (A) Values of input in the past and in the future (B) Values of input at that time and in the past (C) Values of input at that time and in the future (D) none

asked May 17, 2018 in Digital Signal Processing by Shimroz123
0 answers 65 views
asked Sep 14, 2018 by anonymous
1 answer 8 views

 Damping torque used in energy meter is : - a) Electrostatic b) Electro magnetic c) Eddy Current d) None

asked Apr 14, 2018 in Instrumentation and control by Shimroz123
1 answer 10 views

List the different methods to produce damping torque.

asked Sep 6, 2018 by Shimroz123
1 answer 5 views

State the function of controlling torque in electrical measuring instrument.

asked Sep 6, 2018 by Shimroz123
0 answers 97 views

In a portable instrument, the controlling torque is provided by  A) Spring B) gravity C) eddy currents D) all of the above

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 15 views

In moving iron instruments, eddy current damping cannot be used as  (a) They have a strong operating magnetic, field (b) They are not normally used in vertical position (c) They need a large damping force, which can only be provided by air friction (d) The introduction of a permanent magnet required for eddy current damping would distort the existing weak operating magnetic field

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 14 views

A moving coil instrument of resistance 5 Ohm requires a potential difference of 75 mV to give a full scale deflection. The value of shunt resistance needed to give a full scale deflection at 30 A is

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

A Hurwitz polynomial D(s) must satisfy two conditions. One is the polynomial is real when s is real. What is the other condition ?

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

asked Sep 6, 2018 by Shimroz123
1 answer 15 views

The output of a feedback control system must be a function of?

asked Mar 27, 2018 in Control System by Shimroz123
0 answers 17 views

The burden of the instrument transformers is (A) VA rating (B) secondary winding current (C) secondary winding voltage (D) (secondary winding current)2 × resistance of secondary winding  

asked Jun 4, 2018 in Electrical Measurements and Instrumentation by Shimroz123

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