SSC JE EE Quiz: Electrical Machine Booster Quiz-19

The flux is maximum in which of following part of DC motor?

If polarity of universal motor is reversed then?

Calculate the speed of DC traction motor given parameters are

Current = 40 A, Torque = 150 N-m;

Operating voltage = 220V, R_a =0.5Ω

Choose the correct option which one represent the mechanical shaft load in  induction motor.

When rotor resistance increases in  induction motor pull out speed will be?

A  transformer connected in λ –Δ, is composed of three single phase transformers, each rated 127V/13.2 kV. The line-to-line voltage ratio for the  transformer is: -

The Armature torque of DC motor running at 1000 rpm is 109.55 N-m and shaft torque of 100 N-m. Then iron loss and friction loss will be

The armature of DC machine is made of_____

Rotor resistance and stand still reactance per phase of a  slip ring induction motor are 0.05Ω and 0.4Ω respectively. What should be the value of external resistance per phase to be inserted in the rotor circuit to give maximum torque at starting?

Which of the following method called as constant power variable torque drive.