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Electrical Fundamentals
1. An aircraft company has decided to replace the copper cables to the main aircraft generators onboard it's Boeing 747s with aluminium cables that are capable of carrying the same current.
a. Describe the effects on the cable with the aircraft at sea level compared to 35,000 feet. Like coefficient of expansion at sea level and on 35,000 feet, resistivity.
2. A parallel plate capacitor was originally constructed using air as the dielectric. For another application, we need to change the dielectric to Mica.
a. Describe fully how this change of dielectric material has affected the capacitor in ALL respects.
Write down basic postulates of sommerfield’s free electron gas model. Show that the number of energy states per unit energy is given by g(E) = 4Rv/h 3 (2m) 3/2 E 1/2 . What is
Cycloconverter Scherbius Drive In this drive instead of dual controlled used in link scherbius drive one phase controlled line commutated cyclconverter is used. This
Define the application of CAM/CAD to engineering design along with its benefits. a) A triangle is prepared by three position vectors A[2 4 1], B[4 6 1], C[2 6 1], get the reflec
A three-phase transposed line is composed of one conductor per phase with flat horizontal spacing of 11 m as shown in Figure 1(a). The conductors have a diameter of 3.625 cm and a
Define Gray Code - bcd to decimal conversion? The Gray Code is a variation on binary code in which only 1 bit is changed from the preceding number. The bit so as to changes is
Discuss merits and demerits of Macro over procedures. The MACRO directive informs assembler the starting of a macro which is used with ENDM directive to enclose a macro. The
Q. Explain about Dial Pulses? Dial pulsing (sometimes known as rotary dial pulsing) is the method basically used to transfer digits from a telephone set to the local switch. Pu
The Central Processing Unit The central processing unit is the brain of whole PLC. The CPU consist of a microprocessor memory chip and other integrated circuits to con
Explain the Advantage of Synchronous Counters? The most significant advantage of synchronous counters is that there is no cumulative time delay because all flip-flops are trigg
In the circuit above, V1 is a dc supply which outputs 12V, R1 has a value of 100 Ω and C1 is 100µF. The switch has been left in the position shown for a long time such that there i
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