Last Answer : Speed torque characteristic of a repulsion induction motor is similar to that of a D.C. compound motor.
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164 views
1 answer
asked
Mar 20, 2018
by
anonymous

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.
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97 views
1 answer
asked
Mar 20, 2018
by
anonymous

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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302 views
1 answer
asked
Mar 20, 2018
by
anonymous

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
asked
Mar 20, 2018
by
anonymous

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
asked
Mar 18, 2018
by
anonymous

Last Answer : A repulsion motor is equipped with commutator.
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123 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The purpose of stator winding in the compensated repulsion motor is to improve power factor and provide better speed regulation.
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110 views
1 answer
asked
Mar 20, 2018
by
anonymous

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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422 views
1 answer
asked
Apr 29, 2018
by
anonymous
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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
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
asked
Apr 28, 2018
by
anonymous

Last Answer : The repulsion-start induction-run motor is used because of high starting torque.
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89 views
1 answer
asked
Mar 20, 2018
by
anonymous
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Last Answer : In repulsion motor direction of rotation of motor is the same as that of brush shift.
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116 views
1 answer
asked
Mar 20, 2018
by
anonymous

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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821 views
1 answer
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Mar 26, 2018
by
anonymous

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.
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324 views
1 answer
asked
Mar 20, 2018
by
anonymous

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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136 views
1 answer
asked
May 8, 2018
by
anonymous

Last Answer : The armature torque of the D.C. shunt motor is proportional to armature current.
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210 views
1 answer
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Mar 20, 2018
by
anonymous

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
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Mar 20, 2018
by
anonymous

Last Answer : Capacitor start motor has high torque in starting
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133 views
1 answer
asked
Sep 13, 2017
by
anonymous

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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638 views
1 answer
asked
Mar 20, 2018
by
anonymous

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
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98 views
1 answer
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Apr 28, 2018
by
anonymous

Last Answer : (b) Clostridium butylicum Lipase Removal of oil stains
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107 views
1 answer
asked
Mar 20, 2018
by
anonymous

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.
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367 views
1 answer
asked
Mar 20, 2018
by
anonymous

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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145 views
2 answers
asked
Apr 24, 2020
by
anonymous

Last Answer : A synchronous motor can develop synchronous torque at synchronous speed.
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114 views
1 answer
asked
Mar 20, 2018
by
anonymous

Why a dc series motor has a high starting torque?
Last Answer : motor
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86 views
1 answer
asked
Mar 15, 2018
by
anonymous

Last Answer : Series motor has got maximum self relieving property.
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193 views
1 answer
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Mar 20, 2018
by
anonymous

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.
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223 views
1 answer
asked
Mar 18, 2018
by
anonymous

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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129 views
1 answer
asked
Apr 28, 2018
by
anonymous

Last Answer : Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of D.C. series motor.
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117 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The ratio of starting torque to full-load torque is least in case of shunt motors.
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878 views
1 answer
asked
Mar 20, 2018
by
anonymous

What is the formula of torque?
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84 views
0 answers
asked
Mar 15, 2018
by
anonymous

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.
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228 views
1 answer
asked
Mar 20, 2018
by
anonymous


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
asked
Mar 26, 2018
by
anonymous

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
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371 views
1 answer
asked
May 1, 2018
by
anonymous

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
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109 views
1 answer
asked
Apr 29, 2018
by
anonymous
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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.
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503 views
1 answer
asked
Mar 20, 2018
by
anonymous

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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817 views
1 answer
asked
Sep 6, 2018
by
anonymous
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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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454 views
1 answer
asked
Sep 6, 2018
by
anonymous

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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217 views
1 answer
asked
Sep 6, 2018
by
anonymous
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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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140 views
1 answer
asked
Sep 6, 2018
by
anonymous
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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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314 views
1 answer
asked
Sep 6, 2018
by
anonymous

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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679 views
1 answer
asked
Apr 30, 2018
by
anonymous

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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157 views
1 answer
asked
Apr 28, 2018
by
anonymous

The torque produced in wattmeter is proportional to
Last Answer : A
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1.2k views
2 answers
asked
Apr 26, 2018
by
anonymous

Last Answer : In a meggar controlling torque is provided by coil.
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573 views
1 answer
asked
Mar 21, 2018
by
anonymous

Last Answer : In a portable instrument, the controlling torque is provided by spring.
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181 views
1 answer
asked
Mar 21, 2018
by
anonymous

Last Answer : For constant torque drive armature voltage control speed control method is preferred.
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177 views
1 answer
asked
Mar 20, 2018
by
anonymous
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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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829 views
1 answer
asked
Mar 20, 2018
by
anonymous
.jpg)
Why high starting torque is required?
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64 views
0 answers
asked
Mar 15, 2018
by
anonymous

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
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587 views
1 answer
asked
May 17, 2018
by
anonymous
