Download Autumn Examinations 2011 - Electrical Engineering II and more Exams Electrical Engineering in PDF only on Docsity!
CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Autumn Examinations 2011
Module Title: Electrical Engineering II
Module Code: MECH 7005
School: Mechanical & Process Engineering
Programme Title(s): Bachelor of Engineering (Honours) in Biomedical Engineering^ –^ Year 2
Bachelor of Engineering (Honours) in Mechanical Engineering – Year 2
Programmes Code(s): EBIOM_8_Y
EMECH_8_Y
External Examiner(s):
Internal Examiner(s): Mr Patrick Collins
Instructions: Answer All Questions
Duration: 2 Hours
Sitting: Autumn 2011
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination. If in doubt please contact an Invigilator
Assume that the op-amps mentioned in these questions are in the standard 8-pin package (Pin 6 = Output , Pin 2 = Inverting terminal , Pin 3 = Non-inverting terminal) and are using standard power supply voltages of +15V and -15V.
1hp = 746W.
- Design an inverting amplifier circuit with a gain of -7. If Vin = 1.5V then what are the voltages on pins 2,3 and 6 of the op-amp? What is the output voltage if Vin = 5V? Modify the circuit so that the gain = -1/7 and repeat the question. [ 8 marks ]
- Design a difference amplifier which will subtract 2 input voltages and multiply the difference by 4. [ 8 marks ]
- Design a low-pass filter with a DC gain of 25dB and a cut-off frequency of 3kHz. What is the gain at 30Hz , 3kHz and 300kHz? [ 8 marks ]
- Design a non-inverting Schmitt trigger with VTU = 3V , VTL = -3V. Draw the transfer function of the circuit for Vin = -5V to +5V. [ 8 marks ]
- By combining op-amp circuits and taking polarity reversal into account , design a circuit to implement the following mathematical function : [ 15 marks ]
Vin 1 Vin 2 Vin Vin Vout
- Draw a star-connected 3-phase system. Clearly identify the line voltage , phase voltage , line current and phase current. [8 marks ]
- Three similar coils each having a resistance of 5 and an inductance of 16mH are connected in (a) star (b) delta to a three-phase 50Hz, 380V supply. Calculate in each case the line current and total power absorbed. [15 marks]
