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In a meggar controlling torque is provided by coil.

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

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Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.

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A)Spring control method: As shown in the figure, the inner ends of the both springs are attahced to the spindle, while outer end of upper spring is attached to the lever and outer ... of spring material: 1.Non Magnetic material 2.Low specific resistance 3.Low temperature coefficient of resistance

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State the function of controlling torque in electrical measuring instrument.

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Function of controlling torque  1. The function is to opposes the deflection force and increases with the increase in the deflection of the moving system, to limit its movement. 2. and brought ... set a position where the two opposing forces i.e. deflection and controlling forces are equal. 

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State the function of controlling torque. Write two types of it.

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Function of Controlling Torque:  To restrict the motion of pointer / spindle and stop the pointer at the relevant position to get correct reading.  To bring back pointer to zero ... measurement is removed.  Types of Controlling Torque: 1. Spring control method 2.Gravity control method 

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The electrical power to a meggar is provided by permanent magnet D.C. generator.

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The operating voltage of a meggar is about 100 V.

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The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be?

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The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be at the slot edge where coil enters or comes out of the slot.

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The meter which does not have any component in it to provide control torque is (A) Electrodynamometer for current measurement (B) Electrodynamometer for voltage measurement (C) Electrodynamometer for power measurement. (D) Electrodynamometer for power factor measurement.

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The meter which does not have any component in it to provide control torque is Electrodynamometer for power factor measurement.

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The torque produced in wattmeter is proportional to

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A

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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.

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

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

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Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be

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Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be 25 N -m

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Torque developed by a D.C. motor depends upon magnetic field, active length of the conductor, current flow through the conductors, number of conductors, radius of armature.

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The torque developed by any 3-phase induction motor at 0.8 p.u. slip is (A) Full-load torque (B) unstable torque (C) starting torque (D) break down

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The torque developed by any 3-phase induction motor at 0.8 p.u. slip is unstable torque

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The maximum torque of d.c. motors is limited by?

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The maximum torque of d.c. motors is limited by commutation.

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In a double squirrel cage induction motor, good starting torque is produced as (A) Large current flows through the outer high resistance winding. (B) Large current flows through the inner high resistance winding. (C) Small current flows through the outer high resistance winding. (D) Large current flows through the inner low resistance winding.

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In a double squirrel cage induction motor, good starting torque is produced as Large current flows through the outer high resistance winding.

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Name the different torque and their function in measuring instrument.

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List of torques in analog instruments:  1. Deflecting torque  2. Controlling / restraining torque.  3. Damping torque.  1. Deflecting torque:  - To create deflection of pointer ... .  - Bring the pointer to standstill quickly.  - To minimize oscillations about final position. 

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The ratio of starting torque to full-load torque is least in case of shunt motors.

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In repulsion motor, maximum torque is developed when brush axis is at 45° electrical to the field axis.

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The torque produced in induction type relay (shaded pole structure) is inversely proportional to the square of the current.

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What is the maximum value of torque angle in synchronous motor?

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The maximum value of torque angle in synchronous motor is 90 degrees electrical.

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The shaft torque of a d.c. motor is less than its armature torque because of .......... losses.

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The shaft torque of a d.c. motor is less than its armature torque because of rotational losses.

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Speed torque characteristic of a repulsion induction motor is similar to that of a D.C. compound motor.

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A synchronous motor can develop synchronous torque at synchronous speed.

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The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

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The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.

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The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

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Why a dc series motor has a high starting torque?

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DC motor gross torque example

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List the different methods to produce damping torque.

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

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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

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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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For constant torque drive armature voltage control speed control method is preferred.

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The armature torque of the D.C. shunt motor is proportional to armature current.

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Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of D.C. series motor.

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For the same H.P. rating and full load speed, following motor has poor starting torque differentially compounded.

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Why high starting torque is required?

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What is the formula of torque?

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Capacitor start motor has high torque in starting

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

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

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In a flux meter, the controlling torque is _____.

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In a flux meter, the controlling torque is not provided at all.

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

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

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

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

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In a dynamo-meter type of moving coil instrument a swamping resistance is provided inorder to: Provide equal time constant for moving coil and fixed coil, when used for ac measurement

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In a particular meter, the deflecting torque is directly proportional to the current flowing through it, the type of meter is (a) moving coil (b) moving iron (c) induction (d) electro-static  

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In a moving iron meter, the deflecting torque is proportional to Square of the current through the coil.

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

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 In a ballistic galvanometer, the deflecting torque is proportional to the current through coil.

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In the case of PMMC rectifier type instruments, the deflecting torque is proportional to Average value of AC current.

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In an energy meter braking torque is produced to maintain steady speed and equal to driving torque

Description :

In a feedback series regulator circuit, the output voltage is regulated by controlling the a. Magnitude of the I/P voltage b. Gain of the feedback transistor c. Voltage drop across the series pass transistor d. Reference voltage

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