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The LVDT is used for the measurement of

Recent questions tagged motor

1 answer 12 views

Why does the speed of a DC shunt motor decrease as the load increases?

asked Jul 5 in DC motor by Shimroz123
2 answers 24 views

State the need of energy conservation in electrical motor.

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 55 views

Describe the following energy conservation methods of electrical motor. i) By motor survey ii) By matching loads with motor rating

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 29 views

State and explain any four factors governing selection of induction motor.

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
2 answers 35 views

Explain energy conservation technique “by improving power quality” for induction motor.

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 97 views

Split phase induction motor

asked Sep 20, 2018 in Electrical Machine by Zeeshan
1 answer 78 views

State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor 

asked Sep 18, 2018 in Industry Electrical Systems-I by Shimroz123
1 answer 51 views

Describe the reason of using dc series motor for electric trains.

asked Sep 18, 2018 in Electrical Machine by Shimroz123
2 answers 70 views

And application.

asked Jul 8, 2018 by Rathod vijay R.
0 answers 100 views

Analyze the differences of FOC and DTC. The switching frequency of FOC is 1.3 kHz and the average switching frequency of DTC is the same.

asked Jun 23, 2018 in Electrical Machine by Erdemuysal
0 answers 142 views

I got some grapic drawing questions guys and I need to see the answers immediately. Stator voltage curve for each four different start up methods.

asked Jun 23, 2018 in Electrical Machine by Erdemuysal
1 answer 33 views

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 27 views

Damper winding in a synchronous motor

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 22 views

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.

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 20 views

A change of 4% in the supply voltage to an induction motor will produce a change of approximately

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 39 views

The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be

asked May 3, 2018 in Electrical machine design by Shimroz123
1 answer 36 views

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is

asked May 3, 2018 in Electrical Machine by Shimroz123
1 answer 40 views

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

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 38 views

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque  (1) Decreases (2) Increases (3) Remains constant (4) None of the above

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 945 views

The motor used for electric traction is  (1) D.C. shunt motor (3) D.C. series motor  (2) D.C. compound motor (4) Synchronous motor

asked May 1, 2018 in Utilization of electrical energy by Shimroz123
1 answer 16 views

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor :  (A) can be operated in first quadrant (B) can be operated in first & second quadrants (C) can be operated in first & fourth quadrants (D) cannot be operated

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

The number of poles of 8/6 stepper motor can be :

asked Apr 30, 2018 in Electrical Machine by Shimroz123
1 answer 15 views

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 :

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 27 views

For using regenerative breaking, the most suitable motor is :  (A) DC series motor  (B) Slip ring induction motor  (C) Squirrel cage induction motor  (D) Synchronous motor

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 21 views

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

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 60 views

The slip of 400 V, three phase, 4 -pole induction motor when rotating at 1440 rpm is 

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 32 views

A 400 V, 50 Hz three-phase induction motor rotates at 1440 rpm on full -load. The motor is wound for

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 28 views

The function of a brush and commutator arrangement in a dc motor is to  (1) produce unidirectional torque (2) produce unidirectional current in the armature (3) help in changing the direction of rotation of the armature (4) reduce sparking

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 18 views

In a self-controlled synchronous motor fed from a variable frequency inverter  (1) the rotor poles invariably have damper windings  (2) there are stability problems  (3) the speed of the rotor decides stator frequency  (4) the frequency of the stator decides the rotor speed

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 9 views

In a DC motor, it is important to place the brushes along ______ A) Magnetic Neutral Axis B) Normal Geometric Axis C) Nominal Geometric Axis D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 56 views

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 20 views

The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 18 views

The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min (A) 100 rpm (B) 200 rpm (C) 400 rpm (D) 800 rpm

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 19 views

In a split-phase induction motor, the resistance/reactance ratios of windings are such that (A) current in the auxiliary winding leads the current in the main winding (B) current in the auxiliary winding lags the current in the main winding (C) both windings develop the same starting torque (D) both windings develop high starting current

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 23 views

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then (A) the flux is constant (B) the flux first decreases and then increases in the same direction (C) the flux increases and decreases in the opposite direction with the same magnitude (D) current flows through the rotor

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 18 views

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

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 19 views

In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians (A) Armature amp-conductors × (θ/360o) (B) Armature amp-turns × (θ/360o) (C) Armature amp-conductors × (1/4 - θ/360o) (D) Armature amp-conductors × (1/8 - θ/360o)

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 31 views

Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor (A) is equal to that of a normal induction motor (B) is less than that of a normal induction motor (C) is greater than that of a normal induction motor (D) may be less or greater than that of a normal induction motor

asked Apr 28, 2018 in Electronics Engineering by Shimroz123
1 answer 152 views

The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 32 views

A 3-phase, 4-pole, 50Hz induction motor runs at a speed of 1440 rpm. The rotating field produced by the rotor rotates at a speed of ________ rpm with respect to stator field. (A) 1500 (B) 0 (C) 1440 (D) 60

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 29 views

An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is (A) 5.06 kW (B) 0.3 kW (C) 100 kW (D) 83.33 kW

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 115 views

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

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 21 views

In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an external resistance in the rotor circuit and the slip is 0.15. If the rotor winding resistance per phase is 0.2 Ω, the external resistance is (A) 0.2 Ω (B) 0.3 Ω (C) 0.4 Ω (D) 0.5 Ω

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 30 views

A three-phase synchronous motor connected to ac mains is running at full load and unity power factor. lf its shaft load is reduced by half and field current is held constant then its new power factor will be

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 20 views

In a d.c. motor, the mechanical output power actually comes from?

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 18 views

A d.c. motor can be looked upon as d.c. generator with the power flow?

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 17 views

The mechanical power developed by the armature of a d.c. motor is equal to?

asked Mar 26, 2018 in DC motor by Shimroz123

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