DPDC Assistant Engineer (Electrical) Questions

Recruitment Test : DPDC Assistant Engineer (Electrical)
Venue : BUET , Compiled By Engr. Kazi Mahmudul Hasan (RUET)

1. Find IB, ICQ, VCE ( Collector Feedback Transistor Circuit)
β= 90, R1= 420 K, R2=15 K, R3=7 K, V= 10 V.
2. Find the H(w) from following equation
4 d2y/dt2 + 2 dy/dt + 3 y (t) = 4 u(t)
3. Draw i) Unipolar RZ ii) Bipolar NRZ iii) Bipolar RZ signal for 11011001 Bit . In practical purposes which one is used and why?
4. A transformer delivery load 3A of P.F. =0.2. its primary and secondary turn ratio 1000 & 200. Find primary current when secondary delivering 80 A at P.F. = 0.8 . Also find primary power factor.
5. A transformer of 4 MVA, 13.2 KV has impudent ( 0.07 + j0.147) delivering power 8 MVA short transmission line having impedance 2 + j0.5. Load at the end of transmission line 10 MVa, 13.2 KV. Find impedance on new base 10 MVA, 13.2 KV also draw the circuit diagram.
6. A Balance Delta Load having resistance 10Ω of each phase is parallel with Balance Y-load having impedance (10 +  j6) of each phase. The supply voltage is 110 V. Find current and line voltage.
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