Please Log in or Register for more.


116 views

1 Answer

Answer :

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

Like 0 like

Please log in or register to answer this question.

Related Questions



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

Show More

164 views 1 answer








Last Answer : In repulsion motor, zero torque is developed when brush axis coincides with the field axis and brush axis is 90° electrical to field axis.

Show More

97 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.

Show More

302 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?

Show More

106 views 0 answers







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.

Show More

1.5k views 1 answer








Last Answer : A repulsion motor is equipped with commutator.

Show More

123 views 1 answer








Last Answer : The purpose of stator winding in the compensated repulsion motor is to improve power factor and provide better speed regulation.

Show More

110 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

Show More

422 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

Show More

3.1k views 1 answer








Last Answer : The repulsion-start induction-run motor is used because of high starting torque.

Show More

89 views 1 answer








Last Answer : In repulsion motor direction of rotation of motor is the same as that of brush shift.

Show More

116 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.

Show More

821 views 1 answer








Last Answer : The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

Show More

324 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.

Show More

136 views 1 answer








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

Show More

210 views 1 answer








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

Show More

164 views 1 answer








Last Answer : Capacitor start motor has high torque in starting

Show More

133 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.

Show More

638 views 1 answer







The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu
Last Answer : The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu

Show More

98 views 1 answer








Last Answer : (b) Clostridium butylicum Lipase Removal of oil stains

Show More

107 views 1 answer








Last Answer : In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.

Show More

367 views 1 answer







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%; }

Show More

145 views 2 answers








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

Show More

114 views 1 answer







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

Show More

86 views 1 answer








Last Answer : Series motor has got maximum self relieving property.

Show More

193 views 1 answer







The synchronous motor will develop maximum power when the load angle is?
Last Answer : The synchronous motor will develop maximum power when the load angle is 900.

Show More

223 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

Show More

129 views 1 answer








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

Show More

117 views 1 answer








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

Show More

878 views 1 answer







What is the formula of torque?

Show More

84 views 0 answers








Last Answer : In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will remain unchanged.

Show More

228 views 1 answer













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.

Show More

5.6k views 1 answer







In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will  (1) reduce to one-half (2) reduce to one-fourth (3) remain unchanged (4) increase four times
Last Answer : In an induction motor if the flux density is reduced.to one-half, of its normal value then the torque will reduce to one-fourth

Show More

371 views 1 answer







In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is :
Last Answer : In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is : 0.075

Show More

109 views 1 answer








Last Answer : In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to 25% of the previous value.

Show More

503 views 1 answer







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

Show More

817 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. 

Show More

454 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. 

Show More

217 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.

Show More

140 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 

Show More

314 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. 

Show More

679 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.

Show More

157 views 1 answer







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

Show More

1.2k views 2 answers








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

Show More

573 views 1 answer








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

Show More

181 views 1 answer








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

Show More

177 views 1 answer








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

Show More

829 views 1 answer







Why high starting torque is required?

Show More

64 views 0 answers







The torque speed characteristic of a repulsion motor resembles which of the following d.c. motor characteristics  A) Separately excited B) Shunt C) Series D) Compound
Last Answer : The torque speed characteristic of a repulsion motor resembles which of the following d.c. motor characteristics Series 

Show More

587 views 1 answer






Show More⇦ PreviousNext ⇨