DESCO recruitment test written Questions

Recruitment Test Question of Dhaka Electric Supply Company Limited (DESCO)

Compiled by: Rony Parvej (IUT, EEE’07)
Post: Assistant Engineer (Electrical)
Time: unknown Full Marks: unknown
Exam Date: 12.12.2010 Venue: unknown

1. Why we use Y connection in alternator?
2. For the following circuit, prove that, f = 1/√ ( 1/L – R/L )
3. What is the maximum efficiency of 100 KVA transformer if core loss is 900W and full load copper
loss is 1600 W.
4. A battery is having 100 Ah capacity and 25% charge. If 10A load is continued for 6 hours then what
is the final condition of the battery?
5. Differentiate between diode rectifier and thyristor rectifier.
6. What is biasing? Write down it’s significance.
7. What is back emf? Write down it’s significance.
8. If per primary winding voltage is 1V then what will be the per secondary voltage?
9. Why transformer is rated in KVA?
10. What is Ferranti effect?

11. When quality factor ά = 100, C=10 pF, then R=?
12. Define Real power, Reactive power and apparent power.
13. Without power factor meter, how can we measure the power factor of a circuit?
14. Why impedance is greater in AC rather than in DC?
15. We have 100A dc and 100A ac. Which will produce high heat and why?
16. What would be the minimum applied voltage at AB point:
17. Given that, I = , l= , B= . What will be the value of force, F ?
18. Draw the circuit diagram of florescent lamp and incandescent lamp.
19. When speed = 950 rpm, pole = 6, f = 50 Hz then slip = ?
20. Why glass insulators are more used than porcelain insulators?
21. What are tha advantages of underground cable?
22. Why low voltage side is short circuited in short circuit test?
Courtesy: Engr. Md. Towhidul Islam, B.Sc Engineer (CUET)

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