Low speed alternators are driven by ______ Steam engine Steam turbines Hydraulic turbines None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
In an alternator, armature reaction is considered equivalent to Fictitious reactance Fictitious resistance Fictitious impedance Fictitious conductance TRUE ANSWER : ? YOUR ANSWER : ?
The dark and bright lamp method is used for Synchronizing Phase sequence Balancing of load Transfer of load TRUE ANSWER : ? YOUR ANSWER : ?
The slip rings emplyod in a 3-phase alternator in hydro station are insulated for Very low voltage Extra high tension voltage Low voltage Full armature voltage TRUE ANSWER : ? YOUR ANSWER : ?
In case of turbo-alternators the rotor is usually made of Manganese steel Laminated stainless steel Cast iron Forged steel TRUE ANSWER : ? YOUR ANSWER : ?
For the same rating, the size of low speed alternator is ______that of high speed alternator. Less than None of the listed here More than About the same as TRUE ANSWER : ? YOUR ANSWER : ?
For producing an emf of given frequency, an alternator will run at greatest speed for _____ poles. 12 4 8 2 TRUE ANSWER : ? YOUR ANSWER : ?
In aircrafts, alternators have operating frequency of 400 Hz 60 Hz 800 Hz 50 Hz TRUE ANSWER : ? YOUR ANSWER : ?
Voltage regulation of an alternator is usually Much lower than that of power transformer Much higher than that of a power transformer Equal to that of power transformer None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
The voltage regulation of an alternator depends on Both load current and pf Power factor only Load current only None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?