Electrical Machines In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then E ∝ φ/f E ∝ φf E ∝ f/φ E ∝ 1/(φf) E ∝ φ/f E ∝ φf E ∝ f/φ E ∝ 1/(φf) ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements regarding the magnetization characteristics of a dc generator : 1. It represents the variation of field flux with field current. 2. Variation of open-circuit terminal voltage with field current is independent of speed 3. It is non-linear from zero to rated field current 4. It helps to determine the critical field resistance at a given speed 5. It always starts from the origin Which of these statements are correct ? 2, 3 and 4 1 and 4 3 and 5 1, 2 and 5 2, 3 and 4 1 and 4 3 and 5 1, 2 and 5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which machine is used for battery charging? DC shunt generator. Compounded DC generator. DC series generator. None of these. DC shunt generator. Compounded DC generator. DC series generator. None of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by KhfBm1.6. Khf2Bm1.6. KhfBm3. KhfBm. KhfBm1.6. Khf2Bm1.6. KhfBm3. KhfBm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings V/2, I/2 and P/4 V, I/2 and P/2 V, I and P V/2, I and P/2 V/2, I/2 and P/4 V, I/2 and P/2 V, I and P V/2, I and P/2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Larger values of air flux density is taken while designing IM for larger output. none. larger bore diameter. both. larger output. none. larger bore diameter. both. ANSWER DOWNLOAD EXAMIANS APP
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