Answer:
Answer in explanation
Explanation:
Initial setting time is the time when the cement starts losing plasticity or begins hardening after addition of water to it.
Final setting time is the time when the cement has completly lost it's plasticity and has set and became hard after addition of water.
The test carried out is vicat's penetration test
The initial setting time can be defined as “time taken by paste to stiffen to such an extent that the Vicatt’s needle is not permitted to move down through the paste through 25 mm.”.
The final setting time can be defined as “ it is the time after which the paste becomes so hard that Vicatt’s 5mm needle doesn’t sinks visibly and leave no impression”.
The importance and use of setting time test of cement paste samples
The importance of setting time test is that it plays a very vital role in the fresh and used(hardened) state of concrete.
It plays a very important role in mixing, transportation, shrinkage, compacting, finishing and removal of formwork
The importance of compressive strength of mortar cubes is that it is the compressive strength that tells us about the performance characteristics of the binder of the concrete which is the cement in this case. The performance characteristics deals with the overall quality of the finished product. Hence, a cement or mortar with good compressive strength is good to ensure the delivery of quality work in the final concrete.
It is important to note that there are applicable standards in form of numbers for compressive strength of a cement or mortar
Performs math operations = calculator
view planets, stars, and objects in space = telescope / measure the length of a piece of paper = ruler / study a petri dish containing bacteria = microscope
Explanation:
- A supply chain is<em> a connected network of individuals, organizations, resources, activities, and technologies involved in the manufacture and sale of a product or service to fulfill customer orders</em>; it starts with the delivery of raw materials and ends with the delivery of the finished product or service to the end consumer.
- Value chain is a <em>business model that describes the full range of activities needed to create a product or service</em>, these steps involve bringing a product from conception to distribution, and everything in between.
- An Integrated value chain is a process that<em> increases customer-perceived value and optimizes the efficiency of the chain</em> through a collaborative plan shared by multiple enterprises that implement and manage the flow of goods, services and information along with the value system.
- A supply ecosystem consists of the <em>elements of the supply chain and the entities that influence the goods, information and financial flows through the supply chain. </em>
I hope you find this information useful and interesting! Good luck!
Answer:
a) Real Power (kW) = 1.5 kW
b) Reactive Power (kvar) is 1.1663 KVAR
c) Apparent Power (kVA) is 1.9 KVA
d) the Power Factor cos∅ is 0.7894
e) the impedance Z in polar and rectangular form is 76 ∠ 37.87° Ω
Explanation:
Given that;
V = 380v
i = 5A
P = 1500 W
determine;
a) Real Power (kW)
P = 1500W = 1.5 kW
therefore Real Power (kW) = 1.5 kW
b) Reactive Power (kvar)
p = V×i×cos∅
cos∅ = p / Vi
cos∅ = 1500 / ( 380 × 5 ) = 0.7894
∅ = cos⁻¹ (0.7894)
∅ = 37.87°
Q = VIsin∅
Q = 380 × 5 × sin( 37.87° )
Q = 1.1663 KVAR
Therefore Reactive Power (kvar) is 1.1663 KVAR
c) Apparent Power (kVA)
S = P + jQ
= ( 1500 + J 1166.3 ) VA
S = 1900 ∠ 37.87° VA
S = 1.9 KVA
Therefore Apparent Power (kVA) is 1.9 KVA
d) Power Factor
p = V×i×cos∅
cos∅ = p / Vi
cos∅ = 1500 / ( 380 × 5 ) = 0.7894
Therefore the Power Factor cos∅ is 0.7894
e) The impedance Z in polar and rectangular form
Z = 380 / ( S∠-37.87) = V/I
Z = ( 60 + j 46.647) Ω
Z = 76 ∠ 37.87° Ω
Therefore the impedance Z in polar and rectangular form is 76 ∠ 37.87° Ω
