In an alternator, for a coil having a span of 2/3 of pole pitch, the coil span factor will be 0.866 0.2 0.6 0.707 TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following prime movers is the least efficient? Diesel engine Steam engine Steam turbine Gas turbine TRUE ANSWER : ? YOUR ANSWER : ?
Turbo alternator are generally used to run at 15000 rpm 1500 rpm 3000 rpm 5000 rpm TRUE ANSWER : ? YOUR ANSWER : ?
Which harmonic will be totally eliminate in an alternator by using a fractional pitch of 4/5 ? Fifth Ninth Third Seventh TRUE ANSWER : ? YOUR ANSWER : ?
The stator of an alternator is identical to that of a ______ 1-phase induction motor 3-phase induction motor Dc generator Roserberg generator TRUE ANSWER : ? YOUR ANSWER : ?
If the number of poles of an alternator is increased, the generated emf Remains the same None of the listed here Increases Decreases TRUE ANSWER : ? YOUR ANSWER : ?
For producing an emf of given frequency, an alternator will run at greatest speed for _____ poles. 4 12 8 2 TRUE ANSWER : ? YOUR ANSWER : ?
High speed alternators are driven by _____. Steam turbines None of the listed here Diesel engines Hydraulic turbines TRUE ANSWER : ? YOUR ANSWER : ?
The frequency of the system with which several alternators are paralleled can be increased of by simultaneously _______ of all generators. Increasing the field excitation Decreasing the speed of prime movers Decreasing the field excitation Increasing the speed of prime movers TRUE ANSWER : ? YOUR ANSWER : ?
A two pole alternator is running at 1500 rpm. Its angular velocity is ______ 118 rad/s 212 rad/s 157 rad/s 192 rad/s TRUE ANSWER : ? YOUR ANSWER : ?