EXAMIANS
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is
YOUR ANSWER : ?
YOUR ANSWER : ?
The principal of starting of 3 - Φ IM is similar to
YOUR ANSWER : ?
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will
YOUR ANSWER : ?
In an alternator the voltage generated per phase is proportional to
YOUR ANSWER : ?
In case of DC Shunt Motor electromagnetic torque developed is
YOUR ANSWER : ?
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by
YOUR ANSWER : ?
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.
YOUR ANSWER : ?
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be
YOUR ANSWER : ?
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce
YOUR ANSWER : ?
In travelling cranes for swing action which motor is preferred?
YOUR ANSWER : ?