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Summarize the steps involved in conducting a no-load and blocked rotor test on an induction motor.
Draw and explain the equivalent circuit of a single-phase induction motor based on the double revolving field theory. Use it to calculate total impedance and input current for a given load condition
A 1100-V, 50-Hz delta-connected induction motor has a star-connected slip-ring rotor with a phase transformation ratio of 3.8. The rotor resistance and standstill leakage reactance are 0.012 ohm and 0.25 ohm per phase respectively. Neglecting stator impedance and magnetizing current Determine (a) the rotor current at start with slip- rings shorted (b) the rotor power factor at start with slip-rings shorted (c) the rotor current at 4% slip with slip-rings shorted (d) the rotor power factor at 4% slip with slip-rings shorted.
The star connected rotor of an induction motor has a standstill impedance of 0.4 + j4 ohm per phase and the rheostat impedance per phase is 6 + j2 ohm. The motor has an induced e.m.f. of 80 V between slip-rings at standstill when connected to its normal supply voltage. Find
Analyze how the power factor of the load affects the voltage regulation of a 2000-V, 1-phase alternator using the synchronous impedance method. Given test data includes: A field current of 2.5 A produces 100 A armature current on short circuit, and 500 V on open circuit. Armature resistance is 0.8 Ω. Compare the differences in regulation at unity, 0.8 leading, and 0.71 lagging power factors.
Analyze how the presence of the third harmonic component in the flux per pole affects the R.M.S. value of the induced e.m.f. per phase in a 6-pole, 3-phase, 50-Hz alternator with 3 slots per pole per phase and 4 conductors per slot arranged in two layers. The coil span is 150°, and the fundamental flux per pole is 0.12 Weber.
List and briefly describe the different methods used for determining voltage regulation of synchronous generators.
State the conditions necessary for synchronization of alternators and list the methods used to achieve it.
Evaluate the implications of neglecting core loss in the equivalent circuit of a single- phase induction motor. How does this simplification affect the accuracy of performance calculations?
Analyze the effect of under-excitation, normal excitation, and over-excitation on the operation of a synchronous motor.
Compare and evaluate the performance of a squirrel cage and a slip-ring induction motor for industrial applications requiring high starting torque. Justify your recommendation.
Compare two common methods used to make a single-phase induction motor self- starting. Compare their effectiveness and state which method you would recommend for a small household appliance.
Analyze the effect of increasing mechanical load on a synchronous motor operating at constant excitation.
Compare the effectiveness of various speed control methods for an induction motor (voltage control, frequency control, rotor resistance control) and justify which is most efficient for variable torque loads.
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BE Electrical
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Official Gujarat Technological University (GTU) examination paper for Electrical Machine- II (Summer 2026, B.E. · Electrical Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.
3150910 Electrical Machine- II
Official GTU PDF · Summer 2026
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