Question

a) Sketch and label the bath tub curve. Explain each section on the graph. (9 marks) b) 1000 similar equipments which are known to have constant failure rates of \( 5 \% \) per 1000 h are put into operation at the same time. Calculate the predicted times which will elapse before: i) 50 (6 marks) ii) 500 equipments have failed in service. (5 marks) QUESTION 4 Given that \( \mathrm{L}=40 \mu \mathrm{H} \) and \( \mathrm{R}=4,02 \Omega \) design a parallel circuit to resonate at \( 800 \mathrm{KH}_{z} \) with a bandwidth of \( 32 \mathrm{KH}_{\mathrm{z}} \). Predict the resonant impedence. (20 marks) QUESTION 5 \( V_{t}=50 \sin \omega t+20(3 U t+30)+10 \sin (5 u t-90) \) is applied to a circuit and the resulting current is \( i=0,5 \sin (u t-37)+0,1\left(\sin \left(3 u t-15^{\circ}\right)+0,09 \sin \left(5 u t-150^{\circ}\right)\right. \). Find total power supplied to circuit and overall power factor of the circuit. (20 marks)

          a) Sketch and label the bath tub curve. Explain each section on the graph.
(9 marks)
b) 1000 similar equipments which are known to have constant failure rates of \( 5 \% \) per 1000 h are put into operation at the same time. Calculate the predicted times which will elapse before:
i) 50
(6 marks)
ii) 500 equipments have failed in service.
(5 marks)

QUESTION 4
Given that \( \mathrm{L}=40 \mu \mathrm{H} \) and \( \mathrm{R}=4,02 \Omega \) design a parallel circuit to resonate at \( 800 \mathrm{KH}_{z} \) with a bandwidth of \( 32 \mathrm{KH}_{\mathrm{z}} \). Predict the resonant impedence.
(20 marks)

QUESTION 5
\( V_{t}=50 \sin \omega t+20(3 U t+30)+10 \sin (5 u t-90) \) is applied to a circuit and the resulting current is \( i=0,5 \sin (u t-37)+0,1\left(\sin \left(3 u t-15^{\circ}\right)+0,09 \sin \left(5 u t-150^{\circ}\right)\right. \).
Find total power supplied to circuit and overall power factor of the circuit.
(20 marks)

a) Sketch and label the bath tub curve. Explain each section on the graph.
(9 marks)
b) 1000 similar equipments which are known to have constant failure rates of 5 % per 1000 h are put into operation at the same time. Calculate the predicted times which will elapse before:
i) 50
(6 marks)
ii) 500 equipments have failed in service.
(5 marks)

QUESTION 4
Given that L=40 μH and R=4,02 Ω design a parallel circuit to resonate at 800 KHz with a bandwidth of 32 KHz. Predict the resonant impedence.
(20 marks)

QUESTION 5
Vt=50 sinω t+20(3 U t+30)+10 sin (5 u t-90) is applied to a circuit and the resulting current is i=0,5 sin (u t-37)+0,1(sin(3 u t-15^∘)+0,09 sin(5 u t-150^∘)..
Find total power supplied to circuit and overall power factor of the circuit.
(20 marks)

Added by Margaret P.

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