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Autumn Examinations 2010 – Electrical Engineering 2 Exam Questions, Exams of Electrical Engineering

Jaypee University of Engineering & TechnologyElectrical Engineering

The questions for the autumn examinations 2010 for the module 'electrical engineering 2' in the bachelor of engineering (honours) in mechanical engineering program at the cork institute of technology. Questions related to op-amp circuits, amplifier design, difference amplifiers, low-pass filters, schmitt triggers, mathematical functions, three-phase systems, and electrical installations.

Typology: Exams

2012/2013

Uploaded on 03/29/2013

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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Autumn Examinations 2009/10
Module Title: Electrical Engineering 2
Module Code: MECH 7005
School: Mechanical & Process Engineering
Programme Title: Bachelor of Engineering (Honours) in Mechanical Engineering – Year 2
Programme Code: EMECH_8_Y2
External Examiner(s): Mr. John T. Hayes, Prof. Robin Clarke
Internal Examiner(s): Mr. Paddy Collins
Instructions: Answer All Questions.
Duration: 2 Hours
Sitting: Autumn 2010
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.
pf3

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CORK INSTITUTE OF TECHNOLOGY

INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ

Autumn Examinations 2009/

Module Title: Electrical Engineering 2

Module Code: MECH 7005

School: Mechanical & Process Engineering

Programme Title: Bachelor of Engineering (Honours) in Mechanical Engineering – Year 2

Programme Code: EMECH_8_Y

External Examiner(s): Mr. John T. Hayes, Prof. Robin Clarke

Internal Examiner(s): Mr. Paddy Collins

Instructions: Answer All Questions.

Duration: 2 Hours

Sitting: Autumn 2010

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.

  1. Fill in the blanks : An ideal op-amp has input resistance. An ideal op-amp has open-loop gain. An ideal op-amp has current flowing into the inverting and non-inverting terminals. [ 3 marks ]
  2. 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 ]
  3. Design a difference amplifier which will subtract 2 input voltages and multiply the difference by 4. [ 8 marks ]
  4. 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 ]
  5. 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 ]
  6. 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

  1. Draw a star-connected 3-phase system. Clearly identify the line voltage , phase voltage , line current and phase current. [5 marks ]
  2. 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]