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Examination Paper: Electro Technology 2, Cork Institute of Technology, 2011/12, Exams of Electrical Engineering

University of AllahabadElectrical Engineering

An examination paper for the module electro technology 2, offered by the cork institute of technology during the winter semester of 2011/12. The paper is part of the bachelor of science (hons) in sustainable engineering and bachelor of engineering in building services engineering programs. It includes instructions for candidates, two sections with questions related to electrical circuits and power factors, and requirements for the examination. Intended for university students.

Typology: Exams

2012/2013

Uploaded on 03/29/2013

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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2011/12
Module Title: Electro Technology 2
Module Code: MANU6004
School: School of Mechanical & Process Engineering
Programme Title: Bachelor of Science (Hons) in Sustainable Engineering
Bachelor of Engineering in Building Services Engineering
Programme Code: ESENT_8_ Y2 / EBSEN_7_Y2
External Examiner(s): Mr. C. Leddy, Dr. B. Costelloe, Mr. Paul Kenny, Mr. Conor Buckley
Internal Examiner(s): Mr T. O’Callaghan
Instructions: Answer TWO questions from Section A and TWO questions from Section B.
All questions carry equal marks.
Duration: 2 Hours
Sitting: Winter 2011/12
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 paper.
If in doubt please contact an Invigilator.
pf3

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CORK INSTITUTE OF TECHNOLOGY

INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ

Semester 1 Examinations 2011/

Module Title: Electro Technology 2

Module Code: MANU

School: School of Mechanical & Process Engineering

Programme Title: Bachelor of Science (Hons) in Sustainable Engineering Bachelor of Engineering in Building Services Engineering

Programme Code: ESENT_8_ Y2 / EBSEN_7_Y

External Examiner(s): Mr. C. Leddy, Dr. B. Costelloe, Mr. Paul Kenny, Mr. Conor Buckley

Internal Examiner(s): Mr T. O’Callaghan

Instructions: Answer TWO questions from Section A and TWO questions from Section B.

All questions carry equal marks.

Duration: 2 Hours

Sitting: Winter 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 paper. If in doubt please contact an Invigilator.

Section A

Q1. A coil of 0.2H inductance and negligible resistance is connected in series with a 50 Ω resistor to a 230 volt, 50 Hertz supply. Calculate for the circuit (a) inductive reactance ( 4 Marks) (b) impedance ( 4 Marks) (c) current ( 3 Marks) (d) power factor ( 3 Marks) (e) phase angle between supply voltage and current ( 3 Marks) (f) power consumed ( 4 Marks) (g)draw the impedance triangle. ( 4 Marks)

Q2. An 80 ohm resistor and a 50 microfarad capacitor are connected in parallel across a 230 volt 50 Hertz supply.

(a)Draw a neat labelled diagram of the circuit. ( 3 Marks) Calculate: (b) the capacitive reactance of the capacitor ( 3 Marks) (c) the current in the capacitor ( 2 Marks) (d) the current in the resistor ( 2 Marks) (e) the total current ( 4 Marks) (f) the circuit power factor ( 3 Marks) the total power consumed by the circuit. ( 3 Marks)

Q3. An induction motor takes a current of 10Amps at 0.7 P.F. lagging from a 240 volt,

50 Hz supply. A is capacitor connected in parallel with the motor to improve the overall

P.F. to 0.95 lagging..

Draw the phasor diagram to scale and determine:

(a) the current taken by the capacitor (8 Marks)

(b) the current taken from the supply with capacitor in circuit. (8 Mark)

(c) calculate the capacitance of the capacitor (9 Marks)