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Is electricity faster than lightning?

Recent questions tagged speed

1 answer 16 views

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

asked Jul 5 in DC motor by Shimroz123
1 answer 6 views

Describe the following errors and their compensation: (i) Phase error (ii) Speed error

asked Sep 6, 2018 by Shimroz123
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 73 views

The number of cycles in which a high speed circuit breaker can complete its operation is  (A) 3 to 8 (B) 10 to 18 (C) 20 to 30 (D) 40 to 50

asked May 8, 2018 in Switchgear And Protection by Shimroz123
2 answers 35 views

The fall in speed of a dc generator due to increase in load can be corrected by  (1) cooling the armature.. (2) increasing the excitation. (3) reducing the load voltage. (4) increasing the input to the prime mover

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 7 views

The unit of speed regulation of a governor is :  (A) Hz (B) Hz/MW (C) Hz/MVA (D) rpm/MVAR

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 57 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 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 21 views

The ADC having highest conversion speed is (A) Dual-slope ADC (B) Successive approximation ADC (C) Flash ADC (D) Servo ADC

asked Apr 28, 2018 in Digital Instrumentation by Shimroz123
1 answer 20 views

In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 10 views

Under constant load conditions, the speed of a d.c. motor is affected by?

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 6 views
1 answer 14 views

The speed of a D.C. motor can be controlled by varying  1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

asked Mar 20, 2018 in Electrical Machine by Shimroz123
1 answer 31 views

Is the speed of alternator is directly proportional to frequency?

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 27 views

Salient pole rotor is use for which speed?

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 19 views

Which rotor is use for high speed in turbo alternators?

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 18 views

If we change the excitation of synchronous machine will it affect on motor speed?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 32 views

An electric motor in which both stator field and rotor rotates with same speed is called?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 22 views

Synchronous motor always runs at which speed?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
0 answers 13 views

Which motor has the best speed regulation?

asked Mar 15, 2018 in Electrical Engineering by Quiz
0 answers 18 views

Why the speed of synchronous motor is constant?

asked Mar 15, 2018 in Electrical Machine by Quiz
0 answers 11 views

How do you measure the speed of a motor?

asked Mar 15, 2018 in Electrical Engineering by Quiz
0 answers 230 views

What is the speed of an electromagnetic wave in water?

asked Mar 10, 2018 in Engineering electromagnetic by Quiz

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