Why field rheostat is kept in minimum position while armature rheostat at maximum position?
Why must lead-acid batteries always be kept in an upright position?
A 3 φ I.M. has synchronous speed of 250rpm and 4% slip at full load. The rotor has a resistance of 0.02Ω/ph and stand still reactance of 0.15Ω/ph. Calculate i) The speed at which max torque is developed. ii) The ratio of maximum to F. L. torque. iii) The ratio of maximum to starting torque.
Calculate speed of motor when delivery maximum voltage. Also calculate the resistance to be added to achieve 3/4th of maximum torque at time of starting.
Why induction motor draws heavy current at starting?
Why DC motors are self-starting?
Why DC motors are self starting?
Define armature reaction in an alternator. Explain the effect of armature reaction at various power factors of loads of alternator.
A motor has to exert power starting from zero and rising uniformly to 150 HP in 8 mins after which it works at constant power of 100 HP for 5 mins. The motor remains on no load for next 5 mins. The cycle again starts and repeats indefinitely. Determine suitable size of motor.
Which motors are called self starting motors?
Describe any two methods of starting synchronous motors.
Name any two methods of starting synchronous motors.
Why motor are rated as KW while transformer rated in kVA?
At what point does the maximum total power occur?
An industrial consumer charged with the scheduled tariff of Rs.250 /kVA per month for maximum demand and 150 paisa per unit consumed for load factor of 60% and 80%. Find overall cost per unit at i) unity P.F. ii) 0.9 P.F. consider maximum demand of 50 kVA.
What will happen if a lead acid battery is kept in discharged condition for a long time? Answer : If a lead-acid battery is kept in a discharged state for a long time, several things can happen that can damage the battery permanently: 1. **Sulfation**: When a lead-acid battery is ... try to charge it fully and then maintain it with periodic charging to keep the battery in good condition....
Why is the starting current high in a DC motor?
Why is my battery not charging while charging?
Why are primary cells such as voltaic cells not rechargeable while secondary cells such as the lead storage cells rechargeable?
What is the formula for electric field intensity at origin?
What is the relationship between electric field at A point and its distance from A short dipole?
At what point is the electric field strongest?
At which point is the electric field intensity zero due to an electric dipole?
What is the relation between electric field at a point and its distance from short dipole?
At which location is the electric field strength the greatest?
Why is it called a rheostat?
Why is it called armature?
What is the armature winding made up of and why?
What is the purpose of a pole slipping protection scheme in synchronous motors?
What is the purpose of thermal overload protection in motors?
What is the purpose of skewing in rotor design of induction motors?
What is the purpose of using capacitors in single-phase induction motors?
Why is my DC motor not self-starting?
Why induction motor is called self starting?
Why is a synchronous motor self-starting?
List the types of DC Motors based on the connection of the field windings.
What are the different losses that occur in thyristor while operating? Answer : In a thyristor (also known as a Silicon Controlled Rectifier or SCR), several types of losses occur during its operation. These losses can be broadly categorized into the following types: ### ... . Managing these losses is key to ensuring the performance of the device in power electronics circuits....
State any four IE Rules to be followed in respect of safety while working on electrical installation system.
List the factors to be considered while designing feeders and distribution with their functions in brief.
How to calculate maximum electric field strength?
Where is electric field maximum?
What is the maximum electric field intensity?
What is the maximum electric field strength?
What is maximum field strength?
What is the minimum salary in Google?
How does a quadrature encoder measure position and direction?
How does a quadrature encoder interface measure rotational position? Answer : A quadrature encoder interface measures rotational position by using two signal channels, typically referred to as **Channel A** and **Channel B**, that generate pulses as the encoder shaft turns. ... position of the shaft, determine the direction of rotation, and calculate how far it has turned....
How does a magnetic levitation system control object position?
How does a quadrature encoder interface measure position?
How does a capacitive position sensor work?
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