Electrical Machines questions
5 job-exam questions on Electrical Machines from 3 papers — BB, BPSC, DPDC and more — with answers and discussion.
Papers
- November 2026 – Written (BPSC) — BPSC · Assistant Engineer (EEE)
- October 2025 – Written (BUET) — DPDC · Assistant Engineer (EEE)
- 2019 – Written (BUET) — BB · Assistant Maintenance Engineer
Questions
- A 220 V shunt motor takes 20 A. The armature resistance is 0.5 Ω and the field current is 1 A. Calculate the back emf, mechanical power…
- Derive the EMF equation of a DC motor.
- A 3phase 12 pole alternator running at 500 rpm supplying power to an 8 pole induction motor. If slip is 3% what is the full load speed of…
- A 3-phase, 10-kVA, 400-V, 50-Hz, Y-connected alternator supplies the rated load at 0.8 p.f. lagging. If armature resistance is 0.5 Ω and…
- A 350 kVA, 200/400 V transformer has 1.2% resistance and 5.7% reactance. Find voltage regulation at rated load and 0.9 PF lagging. Also…