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Recent tagged torque




DC motor gross torque example
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.
Last Answer : 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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824 views 1 answer



Name the different torque and their function in measuring instrument.
Last Answer : 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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461 views 1 answer



State the function of controlling torque in electrical measuring instrument.
Last Answer : 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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219 views 1 answer



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.

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142 views 1 answer



State the function of controlling torque. Write two types of it.
Last Answer : 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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317 views 1 answer



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 ... the outer high resistance winding. (D) Large current flows through the inner low resistance winding.
Last Answer : 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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137 views 1 answer



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. 

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680 views 1 answer



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
Last Answer : 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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431 views 1 answer



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
Last Answer : 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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130 views 1 answer



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

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159 views 1 answer



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

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3.1k views 1 answer



The torque produced in wattmeter is proportional to
Last Answer : A

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1.2k views 2 answers



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

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5.6k views 1 answer



The maximum torque of d.c. motors is limited by?
Last Answer : The maximum torque of d.c. motors is limited by commutation.

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857 views 1 answer




Last Answer : In a meggar controlling torque is provided by coil.

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574 views 1 answer




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

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183 views 1 answer




Last Answer : 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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644 views 1 answer




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

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179 views 1 answer




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

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214 views 1 answer




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

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118 views 1 answer




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

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164 views 1 answer




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

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880 views 1 answer




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

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169 views 1 answer




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

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117 views 1 answer




Last Answer : A synchronous motor can develop synchronous torque at synchronous speed.

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115 views 1 answer



The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?
Last Answer : 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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306 views 1 answer



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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106 views 0 answers




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

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835 views 1 answer



What is the maximum value of torque angle in synchronous motor?
Last Answer : The maximum value of torque angle in synchronous motor is 90 degrees electrical.

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1.5k views 1 answer



Why a dc series motor has a high starting torque?
Last Answer : motor

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86 views 1 answer



Why high starting torque is required?

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What is the formula of torque?

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Last Answer : Capacitor start motor has high torque in starting

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136 views 1 answer