Electrical Engineering Answers

A capacitance is made of two parallel conducting plates as shown in the figure and the distance between the plates is 'd'. (i) write the value of capacitance as a function of all the possible dimensions from L,W, h and d (ii) if a dielectric slab of thickness 't' and area of cross-section A (t<d), and relative permittivity Er is inserted in between the plates, what will be the value of capacitance (i) If a voltage V is applied between the plates, find the voltage across various sections (iv) If the dielectric slab is of length L/2 and width 'W and relative permittivity Er and is inserted in between the plates from right end, what is the value of capacitance.

2. Explain the effects of thermal shock on the behaviour and properties of ceramics

• You should identify specific applications to describe the effects on the ceramic.

• Use relevant diagrams to support your findings.

• Write at least 500 words.

Explain the effects of oxidation on the behaviour and properties of two different metals. 

• You should identify specific applications to describe the effects on each metal.

• Use relevant diagrams to support your findings.

• Write at least 500 words.

Q.4 Design a sequential circuit with two D flip-flops A and B, one input x, and one output y.

When x = 0, the state of the circuit remains the same with output y=1. When x = 1, the circuit

goes through the state transitions with output y=0. The state transitions from 00 to 01, to 11,

to 10, back to 00, and repeats.

Q.3 Design a sequential circuit by using JK-flip flop which can detect a sequence of three or more consecutive 1’s in a string of bits coming through an input line.

Q.2 Design a sequential circuit by using T-flip flop which can detect a sequence of three or more

consecutive 0’s in a string of bits coming through an input line.

A PN flip-flop has four operations: clear to 0, no change, complement, and set to 1, when

inputs P and N are 00, 01, 10, and 11, respectively.

(a) Tabulate the characteristic table.

(b) Derive the characteristic equation.

(c) Tabulate the excitation table.

(d) Show how the PN flip-flop can be converted

to a D flip-flop.

If an amplifier working with ±5 V DC power supplies requires a minimum output voltage of 2.3 V across a load resistance of 185 ohms, calculate the minimum average current to be drawn from each power supply, if the efficiency of the amplifier is 50 %.

Select the rating of the fuse, keeping in view the standards of fuse rating manufactured by manufacturers, to protect a resistive circuit having 18 A full load current.

Multi Line Text.

(1 Point)

If you are given two cartridge fuses of unequal lengths, discover, by stating reason (s), which one might be a high voltage fuse.

Multi Line Text.

(2 Points)