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Questions in engineering

[Answered] What is your actual subcooling when your ambient temperature is 88 degrees, you have an R410A system, head pressure is 305 psig, and liquid line temperature is 88 degrees?

[Answered] NFPA 1001 FIREFIGHTING FOAMS EXAMINATION Please answer the following test questions: 1. Choose the answer below that is exclusively designed for generating high-expansion foam. A. Solid bore nozzles B. Mechanical blower generators C. Air-aspirating foam nozzle D. Water aspirating nozzles 2. A foam with an expansion rate above 200 and up to 1000:1, is used primarily on which of the below events? A. Class C Fires B. Pressurized gas fires C. Confined space fires D. Class D fires 3. Foam ______ flammable liquids. A. has a lower density than B. has a higher density than C. has about the same density as

[Answered] 1. A D-region in a reinforced concrete member is defined as a portion a) Where strain varies linearly through the depth b) Within a distance equal to the member height *h* from a discontinuity c) Governed by St. Venant's principle d) With uniform stress distribution 2. Which statement about bottle-shaped struts is false? a) They require transverse reinforcement to control splitting cracks b) Their effective strength *fce* uses *βs* = 0.75 c) They have uniform width along their length d) They are idealized with a 1:2 taper at ends 3. A nodal zone resisting three compressive forces is classified as a) C-C-C node b) C-C-T node c) C-T-T node d) T-T-T node 4. The effective compressive strength *fce* for a bottle-shaped strut with transverse reinforcement is a) 0.85 × 0.60 *f'c* b) 0.85 × 0.75 *f'c* c) 0.85 × 1.0 *f'c* d) 0.85 × 0.80 *f'c* 5. For deep beams, the minimum horizontal reinforcement *Avh* must satisfy a) *Avh* ≥ 0.0025 *bws* b) *Avh* ≥ 0.0015 *bws*^2 c) *Avh* ≥ 0.003 *bws* d) *Avh* ≥ 0.83 *f'c* *bwd* 6. If the anchorage length of a tie exceeds the extended nodal zone, the ACI Code requires a) Increasing the strut width b) Using hooks, mechanical anchors, or extending the bar c) Reducing the concrete strength d) Ignoring the anchorage requirement 7. A hydrostatic nodal zone is designed to ensure a) Equal compressive stresses on all faces b) Maximum tensile stress at the node c) Minimal use of reinforcement d) Zero strain compatibility 8. According to ACI Code 11.8.3, the maximum nominal shear strength *Vn* for a deep beam is a) 0.83 *f'c* *bwd* b) 1.1 *f'c* *bwd* c) 0.17 *f'c* *bwd* d) 0.75 *f'c* *bwd* 9. Transverse reinforcement in bottle-shaped struts is primarily used to a) Increase axial load capacity b) Resist longitudinal splitting due to spreading compression c) Reduce nodal zone dimensions d) Replace tension ties 10. An efficient strut-and-tie model prioritizes a) Maximizing the number of tension ties b) Minimizing energy by using stiff compression paths c) Uniform nodal zone sizes

[Answered] Technician A says torque-to-yield bolts are often one-time-use fasteners. Technician B says that torque-to-yield bolts will usually have a tightening specification that calls for a certain torque, and then a number of degrees further. Who is correct? A) A only B) B only C) Both A & B D) Neither A nor B

[Answered] What is a sensory indication of a refrigerant leak? A. Water pooling below the condenser coil B. A strong odor around the components C. Oil residue around a fitting or mechanical joint D. Frost around a fitting or mechanical joint

[Answered] Write a slogan to encourage the usage of EVs.

[Answered] Electrical protective gloves shall be subjected to periodic electrical testing. A. Every 6 months B. Every 3 months C. Every 12 months D. Every 9 months

[Answered] 4. Propellers created during World War I were used to make the first wind turbines, which generated electricity rather than milling grain or pumping water. a. True b. False 5. Most modern wind turbines make use of aerodynamic lift. a. True b. False

[Answered] Which of the following is NOT a characteristic of the gasoline particulate filter system? A. The particulate must be manually cleaned every five thousand miles B. May be separate from the catalytic converter C. Designed to capture exhaust gas particulates in the exhaust system D. May be combined with the catalytic converter

[Answered] The best turbines today capture a. at least 75% b. approximately 25% c. no more than 33% d. more than 50% of the wind's power.