Recruitment
Test : DPDC Assistant Engineer (Electrical)

Venue : BUET , Compiled By Engr. Kazi Mahmudul Hasan (RUET)

Venue : BUET , Compiled By Engr. Kazi Mahmudul Hasan (RUET)

1. Find I

_{B}, I_{CQ}, V_{CE }( Collector Feedback Transistor Circuit)
β= 90, R

_{1= }420 K, R_{2}=15 K, R_{3}=7 K, V= 10 V.
2. Find the H(w) from following
equation

4 d

^{2}y/dt^{2}+ 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.