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Andru [333]
4 years ago
9

Ray L. Zapp is thinking about testing strategies for his new HashTable class, which uses Rainforest's cloud storage service to m

ake hash tables persistent. For the next 4 questions, write the letter of the one BEST testing technique (from the list below) to achieve the listed testing goal. (Some testing techniques may be used more than once or not at all.) A. Black-box testing B. Fuzz testing C. Stubbing& mocking D. Mutation testing E. White-box/glass-box testing 4 13.(1 pts) Making sure the hash table is robust when presented with nonsensical input 15. (1 pts) Making sure his service behaves correctly when Rainforest's cloud storage service is down 16. (1 pts) Improving the thoroughness of coverage of his test suite by uncovering test cases he missed 一( 1 pts) Making sure hash collisions are handled properly
Engineering
1 answer:
notsponge [240]4 years ago
4 0

Answer:

As Ray L zapp is thinking about new strategies to test his new hash Table,hence therefore the best testing technique is  Stubbing& mocking .

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Complete the following sentence. The skills and content of several subject areas were combined to form a new field known as a me
Svetlanka [38]

Answer:

The answer is "discipline" , I was doing the same thing a minute ago. I hope this anwser is helpful! ^^

Explanation:

5 0
3 years ago
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The free convection heat transfer coefficient on a thin hot vertical plate suspended in still air can be determined from observa
damaskus [11]

Answer:

h = 6.35 W/m².k

Explanation:

In order to solve this problem, we will use energy balance, taking the thin hot plate as a system. According to energy balance, the rate of heat transfer to surrounding through convection must be equal to the energy stored in the plate:

Rate of Heat Transfer Through Convection = Energy Stored in Plate

- h A (Ts - T₀) = m C dT/dt

where,

h = convection heat transfer coefficient = ?

A = Surface area of plate through which heat transfer takes place = 2 x 0.3 m x 0.3 m (2 is multiplied for two sides of thin plate) = 0.18 m²

Ts = Surface Temperature of hot thin plate = 225⁰C

T₀ = Ambient Temperature = 25°C

m = mass of plate = 3.75 kg

C = Specific Heat = 2770 J/kg. k

dT/dt = rate of change in plate temperature = - 0.022 K/s

Therefore,

- h (0.18 m²)(225 - 25) k = (3.75 kg)(2770 J/kg.k)(- 0.022 k/s)

h = (- 228.525 W)/(- 36 m².k)

<u>h = 6.35 W/m².k</u>

4 0
3 years ago
Ethylene (C2H4) gas enters a well-insulated reactor and reacts completely with 400% of theoretical air, each at 25°C, 2 atm. The
GuDViN [60]

Answer:see explanation.

Explanation:

(a).The equation of reaction is;

C2H4 + 3(O2 + 3.76N2) -----> 2CO2 + 2H2O + 11.28 N2.

Theoretical air is the amount of air that will allow the complete combustion of the fuel. Air contains 21% of oxygen,79% of Nitrogen. Thus, the molecular mass of air = 29 [Kg/Kmol] . The number of oxygen needed to oxidize the hydrocarbon(C2H4) is 79/21= 3.76 moles of Nitrogen.

(b). N(total) =2+2+11.28 =15.28 kmoles of product

15.28[h(T) - h°] of air

= 15.28(Mass of air) (Cp,1000k)

T(adiabatic) = 802,310 kJ/k. Mole.

When mass of air= 29 Kg/ k.mol

Cp,1000k = 1.142 kJ.k which is the specific heat capacity of air.

T(adiabatic) = 1275k -----> assuming all the products are air.

(C). 2{∆h} co2 + 2{∆h} H20 +11.28 {∆h} N2

After series of calculations and checking of tables:

S(o2) = 320.173 - 8.314 ln 0.12= 337.46 kJ/ K.mol.k

S(H2O)= 273.986- 8.314 ln 0.1406 = 290.30 KJ/ kmol. K

S(N2) = 258.503- 8.314 ln 0.7344= 261.07 kJ/kmol.k

= 2(337.46) + 2(290.30)+11.28(261.07)-360.79-3(218.01)-11.28(193.46)

=1003.3378 kJ/kmol. K

5 0
3 years ago
A hydraulic jump is formed in a 4m wide outlet just downstream of a control gate, which is located at the upstream end of the ou
cupoosta [38]

Answer:

Width w = 4m

Glow depth = y1 = 20m

Outlet discharge = 40m

V1= velocity of flow = 40/20*4 = 1/2 = 0.5m/s

Froud number = v1/√gy1

= 0.5/√9.81x20 = 0.0356

1. Y2/20 = 1/2[-1+√1+8*(0.0356)²]

Y2 = 0.05

2. Energy loss in the jump = (20-0.05)²/4x20x0.05

= 1985m

7 0
3 years ago
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Plan, design, and implement solar energy projects
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