For a D.C. machines laboratory following type of D.C. supply will be suitable Induction motor D.C. generator set Synchronous motor D.C. generator set Mercury are rectifier Rotary converter TRUE ANSWER : ? YOUR ANSWER : ?
The armature core of a D.C. generator is usually made of Nonferrous material Copper Silicon steel Cast-iron TRUE ANSWER : ? YOUR ANSWER : ?
In a wave winding, the commutator pitch is approximately equal to Twice the pole pitch Pole pitch Thrice the pole pitch None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
While applying Fleming's right-hand rule to and the direction of induced e.m.f., the thumb points towards Direction of flux Direction of motion of the conductor if forefinger points in the direction of generated e.m.f. Direction of motion of conductor, if forefinger points along the lines of flux Direction of induced e.m.f. TRUE ANSWER : ? YOUR ANSWER : ?
The yoke of a dc machine is made of Silicon steel Soft iron Aluminum Cast steel TRUE ANSWER : ? YOUR ANSWER : ?
The armature copper loss in a dc generator is a Variable loss Stray loss None of the listed here Constant loss TRUE ANSWER : ? YOUR ANSWER : ?
In case of D.C. machine winding, number of commutator segments is equal to Number of armature coils Number of armature conductors Number of armature coil sides Number of armature turns TRUE ANSWER : ? YOUR ANSWER : ?
In a dc generator, armature reaction _____ pole tip. Strengthns the flux at the leading Weaknes the flux at the leading Weaknes the flux at the trailing None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
In a commutator Mica is harder than copper None of the listed here Copper is harder than mica Mica and copper are equally hard TRUE ANSWER : ? YOUR ANSWER : ?
The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be 600 V 620 V 640 V 580 V TRUE ANSWER : ? YOUR ANSWER : ?