(a)Explain in detail the Pauli Exclusion Principle. What do you understand by the term Zero-Point Energy, how do you relate it with uncertainty principle? [20]
(b)Discuss in detail free electron model, what are the main assumptions which are considered. Explain electron hole with help of suitable diagram. [20]
(20)
Q. 2
(a)What does Galvanic Cell mean? Explain buffer solution in chemistry with examples. [10]
(b)Explain refractive index. how is it measured? Also discuss its applications. What is photoelectric effect? How X-Rays are produced? [10]
(20)
Q. 3
(a)For engineering applications which operating system is best for computers? What are security and privacy issues are rising due to internet and smart phones. [10]
(b)Explain the working of Class A and Class B amplifiers. write note on following modulations. i) AM ii) FM iii) PM iv) PWM [10]
(20)
Q. 4
(a)What are the inherent problems of two stroke engines? Discuss the lubrication systems of two stroke engine. What Measures are usually taken to stop exhaust pollution and reduce the noise of two stroke engines? [10]
(b)Drawn the actual PV Diagram of 4 stroke petrol engine and explain it step by step. [5]
(c)Mr Aslam's car has a three-litter Spark Ignition V6 engine that operates on a four-stroke cycle at 3600 RPM. The compression ratio is 9.5, the length of connecting rods is 16.6 cm, and the engine is square (Bore = Stroke). At this speed, combustion ends at 20° ATDC. Calculate cylinder bore and stroke length of the engine. [5]
(20)
Q. 5
(a)Differentiate between traditional and engineering ceramics also explain the processing of engineering ceramics and their electric & mechanical properties. [15]
(b)What do you know about use of ceramics in weapons and explosives? [5]
(20)
Q. 6
(a)How a cite for construction of a dam is selected? Write a note on the disadvantages of water dams for producing electricity. [10]
(b)A small inspection car with a mass of 200 kg runs along the fixed overhead cable and is controlled by the attached cable at A. Determine the acceleration of the car when the control cable is horizontal and under a tension T 2.4 kN. Also find the total force P exerted by the supporting cable on the wheels. [10]
(20)
Q. 7
(a)Passengers in the jet transport A flying east at a speed of 800 km/h observe a second jet plane B that passes under the transport in horizontal flight. Although the nose of B is pointed in the 45° northeast direction, plane B appears to the passengers in A to be moving away from the transport at the 60° angle as shown. Determine the true velocity of B. [15]
(b)Write a detail note on how low-cost roads are prepared in developing countries. [5]
(20)
Q. 8
Write note on following properties of the materials.
The 2021 PMS Punjab Principles of Engineering paper set by the PPSC. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet.
Disclaimer Prep Right is independent and not affiliated with PPSC.