ইলেকট্রিক্যাল এন্ড ইলেকট্রনিক্স ইঞ্জিনিয়ারিং (EEE)
All Written Question - (24)
1.
Find currents I and I1 in the following circuit.
Find currents I and I1 in the following circuit.
2.
Determine the Thevenin's equivalent circuit at terminal X-Y of the following circuit.
Determine the Thevenin's equivalent circuit at terminal X-Y of the following circuit.
3.
State maximum power transfer theorem.
Maximum Power Transfer Theorem :
In electrical engineering, the maximum power transfer theorem states that, to obtain maximum external power from a power source with internal resistance, the resistance of the load must equal the resistance of the source as viewed from its output terminals.
4.
If the switch in the following circuit opens at t = 0, find v(t) for t≥ 0 and the initial energy stored in the capacitor.
If the switch in the following circuit opens at t = 0, find v(t) for t≥ 0 and the initial energy stored in the capacitor.
5.
Show that a series RL circuit is a low pass filter if the output is taken across the resistor. Calculate the cut-off frequency (fc) if L = 2 mH and R = 10 kΩ.
Show that a series RL circuit is a low pass filter if the output is taken across the resistor. Calculate the cut-off frequency (fc) if L = 2 mH and R = 10 kΩ.
6.
Compute the average and effective values of the square voltage wave shown in the following figure.
Compute the average and effective values of the square voltage wave shown in the following figure.
7.
Define voltage regulation of a transformer. A 11000/230V, 150 kVA single phase, 50 Hz transformer has cure loss of 1-4 kW and full load cu loss of: 1.6 kW. Determine-
(i) the kVA load for maximum efficiency and value of maximum efficiency at unity power factor.
(ii) the efficiency at half F.L. (full load) and 0-8 power factor (leading).
Define voltage regulation of a transformer. A 11000/230V, 150 kVA single phase, 50 Hz transformer has cure loss of 1-4 kW and full load cu loss of: 1.6 kW. Determine-
(i) the kVA load for maximum efficiency and value of maximum efficiency at unity power factor.
(ii) the efficiency at half F.L. (full load) and 0-8 power factor (leading).
8.
Describe briefly the effect of varying excitation upon the armature current and power factor of a 3- synchronous motor when the input power to the motor is kept constant.
Describe briefly the effect of varying excitation upon the armature current and power factor of a 3- synchronous motor when the input power to the motor is kept constant.
9.
What is Flip-Flop? Explain the operation of R-S Flip-Flop with suitable diagram and also represents its truth table.
10.
What is the problem associated with high in SCR? How this problem can be resolved?
What is the problem associated with high in SCR? How this problem can be resolved?
11.
Why starters are necessary to start 3 induction motors? Write a short note on a star-delta starter.
Why starters are necessary to start 3 induction motors? Write a short note on a star-delta starter.
12.
Sketch vo for the input and network given in the following figure.
Sketch vo for the input and network given in the following figure.
13.
Sketch the speed-torque curve of a DC series motor and discuss its characteristics.
14.
Briefly describe the various types of faults that occur in a power system. What could be the effects of faults within the power system?
15.
What factors determine the choice of nuclear fuel? What type of emission occurs from a nuclear power plant? Explain.
16.
State Nyquist sampling theorem. Why it is necessary to follow Nyquist theorem during analog to digital conversion of a signal? Explain with necessary figures.
18.
What is noise? Explain the characteristics of various types of noise created in telecommunication system.
19.
What is hand-off margin? How proper hand-off can be made to prevent call drop? Explain with necessary figures.
20.
What is multiplexing? Explain the principles of Time Division Multiplexing (TDM) with a sketch to show how the interleaving of channels takes place.
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