Explain the operation of the alarm system and strobe lighting system: By determining the resistance of the resistor in the alarm circuit and explain the
functionality of the resistor in the circuit;
(ii) By providing all circuit theory explanations and calculations to show that the voltage in
the alarm system can be reduced to 5V since the system needs to operate with a current
between 0.4mA to 0.6mA;
(iii) By providing all charge theory explanations and calculations to show the current flowing
in the strobe lighting system.
Without calculating the values oynlain how the current

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

Items are similar to the free issue items, but their access is limited. (clo5) a)-bin stock items free issue b)-bin stock controlled issue c)-critical or insurance spares d)-rebuildable spares e)-consumables