## Top Asked questions

- Unit 3: Engineering Science : LO4 Analyse applications of A.C./D.C. circuit theorems, electromagnetic principles and properties.Get Answer
- Unit 3: Engineering Science - LO2 Determine parameters within mechanical engineering systems.Get Answer
- LO1 Examine scientific data and apply appropriately using computational methods.Get Answer
- Task 4.3 = (a) A 250 kVA, 11 000 V/400 V, 50 Hz single-phase transformer has 80 turns on the secondary. Calculate: (i) the approximate values of the primary and secondary currents; and (ii) the approximate number of primary turns; (b) The primary and secondary windings of a 500 kVA transformer have resistances of 0.42 Ω and 0.0019 Ω respectively. The primary and secondary voltages are 11 000 V and 400 V respectively and the core loss is 2.9 kW, assuming the power factor of the load to be 0.8. Calculate the efficiency on (i) full load; and (ii) half load.Get Answer
- Task 4.2 = (a) Refer to the circuits below= A circuit having a resistance of 12 Ω, an inductance of 0.15 H and a capacitance of 100 μF in series, is connected across a 100 V, 50 Hz supply. Calculate: (i) the impedance; (ii) the current; and (iii) the voltages across R, L and C. (iv) the resonance frequency and Q factor. (b) Three branches, possessing a resistance of 50 Ω, an inductance of 0.15 H and a capacitance of 100 μF respectively, are connected in parallel across a 100 V, 50 Hz supply. Calculate: (i) the current in each branch; and (ii) the supply current. (iii) the resonance frequency and Q factor.Get Answer
- Apply single phase AC theory to solve electrical and electronic engineering problems Task 4.1 = (a) Explain the term "harmonic synthesis". (b) Given the complex waveform v(t) : Plot the graph for v(t) and find out the characteristics of the resulted complex waveform.Get Answer
- Task 3.3 = (a) The winding of an electromagnet has an inductance of 3H and a resistance of 15Ω. When it is connected to a 120V, d.c. supply, calculate: (i) the steady state value of current flowing in the winding, (ii) the time constant of the circuit, (iii) the value of the current after 0.3 s (b) A 15μF uncharged capacitor is connected in series with a 47 kΩ resistor across a 120 V, d.c. supply. Plot the capacitor voltage growth characteristics by preparing a table of data . From the graph, determine the capacitor voltage at a time equal to one time constant after being connected to the supply. Also, find the time for the capacitor voltage to reach its final steady state value.Get Answer
- Task 3.2 = Solve problems using circuit theorems to calculate currents and voltages in circuits (a) By using Norton's Theorem, determine the current in the 5.0 Ω resistor in the network shown (b) sing Superposition Theorem, determine the voltage across the 4 ohm resistor show in the figure below.Get Answer
- Task 3.1 Using Kirchhoff’s laws to calculate currents and voltages in circuits (a) Apply Kirchhoff’s Voltage Law to find the voltage across the resistor R1 in the following circuit.Get Answer
- Task 2.3 A close-coiled helical spring undergoes a static deflection of 30mm when a mass of 2.5 kg is placed on its lower end. The mass is then pulled downwards through a further distance of 20mm and released so that it oscillates about the static equilibrium position. Neglecting air resistance, energy losses in the spring material and the mass of the spring determine: (a) the periodic time and natural frequency of vibration, and (b) the maximum velocity and acceleration of the massGet Answer
- The platform P, has negligible mass and is tied down so that the 0.4-m-long cords keep a 1-m-long spring compressed 0.6 m when nothing is on the platform. If a 2-kg block is placed on the platform and released from rest after the platform is pushed down 0.1 m, Task Fig. 2.2(b), determine the maximum height h the block rises in the air, measured from the ground. ( Hint: the strain energy in the spring is transferred into potential energy in this process.)Get Answer
- Task 2.1 (P2.1) A flywheel, which may be regarded as a disc of diameter 350mm and mass 30 kg is accelerated uniformly from rest by an electric motor to a speed of 500 rpm in a time of 30 s. The drive from the motor is then disconnected and a brake is applied which brings it uniformly to rest whilst rotating through 100 complete revolutions. Neglecting bearing friction and air resistance, determine (a) the moment of inertia of the disc, (b) the accelerating torque, (c) the breaking torque.Get Answer
- If a twisting moment of 1100 Nm is impressed upon a 4.4 cm diameter shaft, what is the maximum shearing stress developed? Draw a diagram to show the shear stress distribution. Also, what is the angle of twist in a 150 cm length of the shaft? The material is steel for which G = 85 GPaGet Answer
- B5E02 Engineering Sciences = Select standard rolled steel sections for beams and columns to satisfy given specifications. (a) Beam selection A standard rolled steel I-section is required for the simply supported beam shown in Figure Task 1.2.a. A factor of safety of 12 is to apply and the ultimate tensile strength of the material is 510 MPa. Select a standard rolled steel I-section from the tables provided in Lecture 1.2 that satisfy the given specifications. The selected section must have the least possible depth. The weight of the beam itself may be neglected when calculating the maximum bending moment (b) Column selection A strut of length 8m with one end direction-fixed and one end pin-jointed is required to carry a compressive load of 750 kN. Select a suitable universal steel column from the tables provided in Lecture 1.2 that satisfy the given specifications and has the least mass.Get Answer
- The W360-3-79 rolled-steel beam AC shown below is simply supported, and it carries the uniformly distributed load shown. Draw the shear and bending moment diagrams for the beam, and determine the location and magnitude of the maximum normal stress due to bending.Get Answer
- That is question about signals and systems.Get Answer

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