Questions and Answers

Date & Time of

Upload

07.05.2020

9.00 AM

Submission Deadline &

Date

09.05.2020

08.00 AM

Instructions to the Students

1. The Final Assignment will be available in Moodle at 9:00 am on the date of examination.

2. This is an open resource examination; there are (3) pages. Students are allowed to refer any digital materials (Internet, Proquest, Masader, and OER) with proper referencing and citation for each answers.

3. Students has to answer the questions typewritten in the word (.docx) format. Figures / Diagrams, equations and solving of problems can be written by hand and added to the document as a picture/image.

4. Save the assignment file using the student ID & Course code.[ Example : 22s1234 – EEPW2320]

5. Students should submit the answers through the turnitin link provided in moodle page. If any problem occurs, send it to the course tutor email [Email address : [email protected] ]

6. Students are encouraged to upload the answers in the moodle at least two hours before the deadline to avoid any technical issues.

7. In case of any technical problem in opening or submitting your assignment please contact your course tutor through email and copy to the Department Head.

8. Any form of cheating is punishable. Students involved in cheating will be treated according to the Plagiarism and Academic Integrity Policies.

9. Students are advised to write the answers in their own words. Based on the plagiarism policy and the department approved similarity level, the marks will be deducted for the plagiarized [Copied] answers.

10. Students should complete their assignment within the given time. Assignments submitted after the

deadline will be marked 0.

QUESTIONS [ ANSWER ALL THE QUESTIONS] EACH QUESTION CARRIES 5 MARKS

1

You are in the position to conduct the short circuit test on a single phase transformer in your electrical machines laboratory. Prepare the list of analog meters needed for it and also explain the operation of the meter connected to the secondary with neat diagram.

2

Engineered wood processing involves various methods of turning lumber into wood pulp, wood chips, paper, building materials and other products. To control and increase the rate of moisture evaporation, lumber is typically placed in kilns to be dried. For all these processing equipment’s we have to adjust the voltage applied to the control mechanism. Choose an appropriate device to adjust the applied voltage and explain it with neat diagram.

4

In Muscat, the electricity bill of a cement industry is calculated based on the meter reading fixed in the main electrical panel. Describe the construction and working principle of a meter fixed in the panel board, with neat sketch.

5

Consider that the electrical machines laboratory in your college is equipped with only analog meters. You are in the position to perform the Load characteristics of single phase transformer experiment. List out the meters need for that and explain the operation of any one of the meter with neat diagram.

6

Digital imaging procedures are finding increasing application in preventive maintenance of car engine. As a result, a display device has become an integral part of the preventive maintenance department. Efforts are underway to investigate the suitability of high-resolution display device for preventive maintenance of car engine. Initial results appear to be encouraging. Initial results show that the display device falls short in key performance features such as the maximum luminance, veiling glare (scatter in the glass faceplate) that reduces the modulation transfer, the number of resolvable picture elements,

which is smaller than the number of addressable locations on the fluorescent screen, spatial noise

(phosphor granularity) is limiting the low-contrast detectability, and dynamic range. With neat diagram explain the construction and operation of a display device.

7

The production engineer in Sur chemical factory needs a complete measurement setup to maintain the chemical phenol at -12 °C. Choose a negative temperature coefficient sensor and explain its construction and operation with neat diagram.

8

The pressure mat is used to measure sitting discomfort in helicopter passenger seats. The pressure mat monitor real time surface pressure monitoring from the occupant when seated. Diaphragm sensor is used as a sensing element. The discrete pressure data is used to map the pressure distribution from the backrest and to compute the seat's cushion deflection and corresponding backrest contour caused by the passenger's weight. The sensor mat contains a total of 36 sensing elements arranged in an evenly distributed pattern. The arrangement of the sensors focuses on 3 distinct areas of the backrest for an helicopter passenger seat. Explain the importance of the standardization procedure with particular attention in increasing the repeatability of the measurements and reducing drift and hysteresis in pressure mat.

9

In an electrical machine laboratory, a generator is being tested by the quality department. It is often to note down the various parameters (voltage, current, armature resistance, field resistance) of the generator. The meter used to measure these parameters should not affect the generator under test. Also meter will not affect circuit operation or circuit measurements. Explain a suitable meter for the measurement of various electrical quantities with neat diagram.

10

A switchgear industry in Adam, installations and equipment fulfil with insulation resistance specifications, hence it can operate safely. It involves connection of cables, sectioning and protection equipment, motors and generators and electrical conductors. They are insulated using materials with high electrical resistance in order to limit the flow of current outside the conductors. The quality of these insulating materials changes over time due to the stresses affecting the equipment. These tests detect aging and premature deterioration of the insulating properties. With neat diagram explain the test equipment.