(b)
Explain, with the aid of a sketch or diagram, why the tidal range at a particular location varies over the time period of a lunar cycle.
(2 marks)
(b) Explain, with the aid of a sketch or diagram, why the tidal range at a...
(a) Explain, with the aid of a sketch or diagram, why the Earth experiences tides and why the interval between one high tide and the next is about 12.4 hours. (4 marks)
d) With the aid of a sketch, explain why connecting solar cells directly to a motor is usually unwise. a) With the aid of a diagram, explain how and why an optical isolator is employed in the gate of a voltage driven device. e With the aid of a diagram, explain how DAG systems can make a power network more unstable d) With the aid of a sketch, explain why connecting solar cells directly to a motor is usually unwise....
Q3. (a) Define the terms: i) Tidal range (ii) Diurnal inequality (ii) Amphidromic point (iv) Tidal diamond (4 marks) (b) The table below (Table Q3) summarises the primary harmonic tidal constituents at a harbour. Use this information to classify the form of the tidal curve at the harbour in terms of the tidal ratio, F. Estimate the mean spring tidal range and the mean low water spring level relative to the local datum. Period Amplitude Harmonic (hours) (cms) 12.42 S2...
Question 2 a. With the aid of a diagram, explain why monopoly is regarded inefficient compared to perfectly competitive market. [5 marks b. hat are the FOUR (4) ways that government policymakers can respond to the problem of monopoly firm? 4 marks] c. What characteristics does monopolistic competition have in common with monopoly and perfect competition? 4 marks] d. How does the long-run equiibrium in monopolistic competition differ from the long-run equilibrium in perfect competition? Is the long-run equilibrium in...
Explain with the aid of a diagram why a Zener diode is not suitable to act as a stable reference voltage.
Q5. 5.a. Sketch the circuit arrangement of a DC-DC boost (step up) converter, clearly labelling each circuit element [4 тarks] [Refer to lecture notes] Sketch all significant operating waveforms for this converter for continuous conduction conditions over two switching periods, in particular showing 5.b. the voltage across the main switching device and the boost diode. [2 marks the voltage across the inductor [3 тarks] the current flowing through the inductor [3 marks [Refer to lecture notes] 5.c. The DC-DC boost...
2. With the aid of a chemical potential versus temperature phase diagram, explain why graphite sublimes rather than melts when it is heated from 300 K to 3825 K at standard pressure. Also draw a pT phase diagram that is compatible with this observation.
uestion 1 (10 marks) (a) Relate the following parameters to each other with the aid of a diagram and using standard notation: impulse response, impulse function, and a linear time invariant (LTI) system Without knowing any details of an LTI system, what is the most convenient way of characterising the system? Why? Given an arbitrary input, describe three methods of evaluating the output of an L П system Use diagrams to explain if necessary Out of the three methods, it...
1.(a)Explain the differences between conduction and valence band with the aid of an energy diagram (b)Mention seven differences between charge and current (c)Explain why ammeters are connected in series but not parallel (d)Explain why always a voltmeter is connected in parallel but not in series
(20 Marks) QUESTION With the aid of a fully labelled diagram, draw a Production Possibility Frontier (PPF) for an economy producing computers and pizzas. Use the diagram to explain the concepts of choice, scarcity and opportunity costs. (10 marks) 4.1 2 With reference to the diagram in question 4.1, distinguish between 'efficiency' and 'inefficiency. (4 marks) With the aid of a separate diagram, illustrate and explain what would happen if there was a discovery of an improved technique for producing...