In generators, the cause of rapid brush wear may be Imperfect contact Rough commutator surface Severe sparking Any of these Correct answer: 4. Any of these Visit Electrical Engineering MCQ here for more
The role of conservator in a transformer is To cool the transformer oil To project against internal fault To reduce copper as well as core losses To take care of the expansion and contraction of transformer oil due to variation in temperature of surroundings Correct answer: 4. To take care of the expansion and contraction … Read more
In generator, the number of mechanical degrees and electrical degrees will be the same when Number of poles is 2 Number of poles is 4 RPM is less than 300 RPM is more than 300 Correct answer: 1. Number of poles is 2 Visit Electrical Engineering MCQ here for more
The demagnetizing component of armature reaction in DC generator will Increase armature speed Reduce generator EMF Reduce interpoles flux density Result in sparking trouble Correct answer: 2. Reduce generator EMF Visit Electrical Engineering MCQ here for more
In a generator the actual flux distribution depends on Clearance between tips of the adjacent pole shoes Shape of the pole shoe Size of air gap All of these Correct answer: 4. All of these Visit Electrical Engineering MCQ here for more
The preferred generator for feeding long transmission lines is Flat compound generator Over compound generator Series generator Shunt generator Correct answer: 2. Over compound generator Visit Electrical Engineering MCQ here for more
Two generators A and B have 6 poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced EMF in generator A and B will be 3:1 2:3 4:5 6:8 Correct answer: 1. 3:1 Visit Electrical Engineering MCQ here for more
The terminal voltage of series generator is 150 V when the load current is 5 A. If load current is increased to 10 A, the terminal voltage will be 150 V Greater than 150 V Less than 150 V None of these Correct answer: 2. Greater than 150 V Visit Electrical Engineering MCQ here for … Read more
Compensating windings are employed in generators Primarily to reduce the eddy currents by providing local short-circuits To neutralize the cross-magnetizing effect of the armature reaction To provide path for the circulation of cooling air None of these Correct answer: 2. To neutralize the cross-magnetizing effect of the armature reaction Visit Electrical Engineering MCQ here for … Read more
The power transformer is a constant Current device Main flux device Power device Voltage device Correct answer: 2. Main flux device Visit Electrical Engineering MCQ here for more