DPDC Assistant Engineer (Electrical) Questions

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

1. Find I_B, I_CQ, V_CE ( 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.