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Home Question Bank Engineering Archive 2025 February 05

Engineering Questions from Feb 05,2025

Browse the Engineering Q&A Archive for Feb 05,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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The load requirement in your plans is 50 psf at a joist spacing of 16 inches. If the room is 14 feet 6 inches long by 10 feet 2 inches wide, would boards be appropriate? A. Yes, because boards can support the width of the room. B. Yes, because boards can support the width and length of the room. C. No, because boards can support only the width of the room. D. No, because the boards can support neither the width nor length of the room. DE. 8 STRUCTURES \& MECHANICAL SYSTEMS AND CONTROL What will happen to the mouse when the attachment of the rod is in the 9 o'clock position? when the wheels rotate? To prevent changes in dimensional accuracy, it is important for Material Jetting (MJ) prints to avoid what? oxygen contact with metal sunlight cold temperatures Why is there a high degree of dimensional accuracy for the support material used the advanced slicing software the build plate shape the amount of resin used 40. A motor equipped with a flywheel is to supply a load torque of for 10 sec followed by a light load period of 200 N -m long enough for the flywheel to regain its steady - state speed. It is desired to limit the motor torque to . What should be the moment of inertia of flywheel? Motor has a inertia of 's no load speed is 500 rpm and the slip at a torque of 500 Nm is . Assume speed torque characteristics of motor to be a straight line in the region of interest 39. A motor operates on a periodic duty cycle in which it is clutched to its lord for 10 min and declutched to run on no load for 20 min . minimum temp. rise is . Heating and cooling time constants are equal and have a value of 10 min . when load is declutched continuously the temp. rise is . Determine i. Maximum temp. during the duty cycle. ii. Temp. when the load is clutched continuously 38. A dc shunt motor takes 42 A , and runs at a speed of 1200 rpm . The shunt field resistance is . Assume that the load torque varies as the square of the speed. Neglect iron and friction losses, and armature reaction. Calculate a) The resistance to be connected in series with the armature to reduce the speed to 1000 rpm b) The voltage to be applied to the armature for 1000 rpm , had the control accomplished by Ward-Leonard method 39. A motor operates on a periodic duty cycle in which it is clutched to its lord for 10 min and declutched to run on no load for 20 min . minimum temp. rise is . Heating and cooling time constants are equal and have a value of 10 min . when load is declutched continuously the temp. rise is . Determine i. Maximum temp. during the duty cycle. ii. Temp. when the load is clutched continuously 40. A motor equipped with a flywheel is to supply a load torque of for 10 sec followed by a light load period of 200 N -m long enough for the flywheel to regain its steady - state speed. It is desired to limit the motor torque to . What should be the moment of inertia of flywheel? Motor has a inertia of . It's no load speed is 500 rpm and the slip at a torque of 500 Nm is . Assume speed torque characteristics of motor to be a straight line in the region of interest 1. A dc shunt motor has stored energy per HP of 5000 Nm . At the beginning of the loading of an electric motor its temperature is , determine the time taken to start the motor if the load torque is equal to the full load torque during the starting period and the current is limited to 1.85 times full load current. A separately excited DC motor is controlled by a 1 - phase fully controlled converter with an AC source voltage of . Assume that sufficient inductance is present in the armature circuit to make the motor current continuous and ripple free for any torque greater than of rated torque. Ra (a) What should be the value of the firing angle to get the rated torque at 800 rpm ? (b) Compute the firing angle for the rated braking torque at - 1200 rpm. (c) Calculate the motor-speed at the rated torque and for the regenerative braking in the second quadrant? Method of manufacturing using machinery and division of labor
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