Mechanical Engineering Questions and Answers April 10, 2020

Use appropriate algorithm (with steps and flow chart) to develop machine groups and part families for the information given in Table. Machines 1 2 Parts 1 2 3 4 3 4 5 6 7 8 9 10 1 1 1 1 1 1 1 1 1 1 5 6 7 8 9 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

how you will draw a force of 1000 N on a paper?

A load is to be raised 20 ft by the hoisting system shown. Assuming gear A is initially at rest, accelerates uniformly to a speed of 120 rpm in 5 s, and then maintains a constant speed of 120 rpm, determine (a) the number of revolutions executed by gear A in raising the load, (b) the time required to raise the load. Fig. P15.31 3 in. 18 in. 15 in.

Q1 The arms of the scissors are pin connected at the O point. To ensure balance what should be the size and angle 0 of F1. Take F2 6 kN. 5 kN 70 30 7 kN

7,2o please

MechanicsofMaterials7thedit x OFile CUsersaserDownloadsMechanicsofMaterials7theditionbeer.pdf ... 506 of 897 V Draw O Erase 15 15 Fig. P7.17 Fig. P7.18 7.19 Two wooden members of 80 X 120mm uniform rectangular cross section are joined by the simple glued scarf splice shown. Knowing that B 22 and that the maximum allowable stresses in the joint

Determine the centroid of the cone shown in figure. ( Ans: ()h)

h

Locate the centroid of the semi-elliptical area shown in figure. (Ans: 0.424 ft)

y x dy 1 (x, y), 1 ft y y 2 ft 2 ft 2 ft 2 ft 2

Locate the centroid of the plate area shown in figure. ans: Hint: The plate can be divided into three segments. Here the area of the small rectangle 3 is considered negative since it must be subtracted from the larger one 2.

Determine the required force P in figure needed to maintain the equilibrium of the scissors linkage when = 60o. The spring is unstretched when = 30o. Neglect the mass of the links.

a. Suppose that a liquid mixture of 4.0 mol% n-hexane in n-octane is vaporized. What is the composition of the first vapor formed if the total pressure is 1.00 atm. b. Calculate the fraction of liquid that will remain at equilibrium when a mixture of 68.6 mass % Hexane and 31.4 mass % toluene is vaporized at 80 degree c and 1atm.

How your home refrigerator work? explain with details. Why freezer we placed on the top, not at the bottom. Why we need a compressor in a refrigerator? A similar question is also applicable to Air conditioning. Question 2>How petrol engine works (Otto cycle)? what will happen when I accelerate the bike or car.

Q2 Draw the shearforce and moment diagrams of the beam. A has a fixed pin bearing and B has a sliding bearing. 20 kN 40 kNm A 150 kN m 8 m 3 m

Q3 Calculate the moments of inertia of the crosssectional area of the beam relative to the x and y axes passing through the center of gravity. Firstly, it is necessary to determine the location of the center of gravity. 25 mm 25 mm 100 mm y 25 mm 75 mm 75 mm 150 mm 50 mm 100 mm 25 mm

Describe in detail the method used in manufacturing precision tools, giving its advantages and disadvantages and explain how defects occur during casting of components parts giving the different defects.

Determine the couple moment acting on the pipe shown in the figure about the point O, using both the scalar and vector method. Segment AB is directed 30 below the xy plane.

25 lb 8 in. A 300 25 lb 6 in. B

Determine the resultant moment of the three forces in the figure about the x axis, the y axis, and the z axis.

F2 50 lb F3 40 lb 60 lb 2 ft 2 ft 3 ft 2 ft

Determine the moment MAB produced by the force F in the figure, which tends to rotate the rod about the AB axis.

Two forces acting on the rod is shown in the figure below. Determine the resultant moment they create about the flange at O using resultant formula and then its coordinate direction angles using direction cosines. Express the result as a Cartesian vector.

F (60i 40j 20k lb 2 ft 4 ft B 5 ft F2 80i 40j 30k lb

Determine the moment of the force in the figure below about point O. Also solve the problem using Varignons theorem.

75 45 30 3 m F 5 kN

Force F acts at the end of the angle bracket in the figure below. Determine the moment of the force about point O using scalar method and vector method.

0.2 m 0.4 m 30 F 400 N

Replace the force and couple system acting on the member in in the figure by an equivalent resultant force and couple moment acting at point O.

500 N 750 N 200 N 1 m 1 m 1.25 m 1.25 m 200 N

A lifting machine consists of pulleys arranged in the form of a third pulley system. There are three pulleys in the system. A load of 1000 N is lifted by and effort of 180 N. find the efficiency and the effort lost in friction. Ans: = 79.37%, effort lost = 37.14 N

A load of 20 kN is to be lifted by a differential wheel and axle. It consists of differential axle of 250 mm and 300 mm diameter. The wheel diameter is 800 mm. find the effort required if the efficiency is 55%. Ans: 1136.4 N

A screw jack has a square thread 50 mm mean diameter and 10 mm pitch. The load on the jack revolves with the screw. The coefficient of friction between screw and nut is 0.05. find the tangential force required at the end of 300 mm long lever to lift a load of 6000 N. also calculate, VR, MA and efficiency. Ans: P = 57.01 N, VR = 188.496, MA =

In a double purchase crab, the pinions have 15 and 20 teeth, while the spur wheels have 45 and 40 teeth. The effort handle is 400 mm long while the diameter of the drum is 150mm. If the efficiency of the winch is 40%, what is the load lifted by an effort of 250 N. Ans: 3.2 kN

If the contact surface between a 20 kg block and the ground is smooth, determine the power of force F when t 4 s. Initially the block is at rest. F 30 N 4

04 Ind and draw the shear stress and bending mement for the figure below: 100 lb 120 lb/t 120 Ib/it - 2t 2t 2 t Rs Ra

04 Ind and draw the shear stress and bending mement for the figure below 100 lb 120 lbt 120 Ibit 2t 2t 2 t Rs Ra

Q1. (a) For a flow phenomenon governed mainly by viscous forces, derive the scale factors for velocity, force and power in terms of L, and where subscripts L, and are length, density and dynamic viscosity respectively and x is the ratio of the value of x in the prototype to the value of x in the model.

(b) Volumetric flow rate (discharge) Q through a circular pipe with diameter D can be measured by measuring the speed of rotation N of a propeller-based flowmeter fitted inside the pipe. Use dimensional analysis with ,N,D as recurring set to show that Q=kND 3 , where the propeller coefficient k is a function of D p /D and the propeller Reynolds

(c) A 50 mm-diameter propeller was installed in a 150 mm-diameter water pipe and the propeller speed was measured for a range of water discharge in the pipe. The water had a density and dynamic viscosity of 1000 kg/m 3 and 0.00112 Ns/m 2 respectively. The measured results were as follows: Q (litres/s):12 28 45 63 95 120 160 180 N (rps): 5 10 15 20

A steel pipeline conveys water (density 1000 kg/m3 , bulk modulus 2.05x109 N/m 2 ) from an upper to a lower reservoir the pipeline material is steel with Youngs modulus 210x109 N/m 2 . It is 611 m long, has an internal diameter 1.1m, wall thickness 25 mm and surface roughness 0.68 mm. The flow is controlled by a valve located at the entrance to

b) Given that the head loss coefficient for the valve in its open position is 8.5 and the head loss coefficient at entry to the lower reservoir is 1.4, calculate the difference in elevation between the water level in the lower reservoir and the water level in the upper reservoir under the steady flow condition.

(c) In order to avoid excessively high stress in the pipeline during valve closure, it is proposed that the time to fully close the valve is not shorter than 15 s. Is this a safe closure time given that the maximum allowable hoop stress in the pipe is 110 MPa? Use a steady discharge of 15 m 3 /s if you were not successful with part (a). (Aide mem:

Q3. (a) A pump has the following characteristics where the usual notation applies: Q (m3 /s) 0 0.01 0,02 0.03 0.04 0.05 0.06 0.07 Hp (m) 20 19 17 15 13 10 7 2 (%) 0 35 60 65 65 55 40 25 The pump is to be used to deliver a liquid with density 800 kg/m3 along a 15 km-long, 350 mmdiameter pipeline. The static lift is 12m. Head losses due to friction

Q4. (a) Oil with density 870 kg/m3 is conveyed through a pipe at a discharge of 0.11 m3 /s. At a certain location the pipe bends downwards in the vertical plane through an angle of 30 degrees. The pipe has diameter 311 mm at the bend inlet and 211 mm at the bend outlet, and the outlet is 2.5 m below the inlet. The volume of oil contained in the

(b) how is power input to the turbine defined and how is power output defined? Show that turbine efficiency is given by ?=1/2 ?and show that maximum possible efficiency for a wind turbine is ? max =16/27 (the Betz limit) occurring when u 4 /u 1 = 1/3

1 (usu) (20) (2)

C) Calculate the maximum possible power output from a 31 m-diameter wind turbine operating in a 11 m/s wind, given 1.235 kg/m3 for the density of air?

Q5. (a) Three wells, equidistant apart along a straight line, span the entire depth from the land surface to the lower boundary of aquifer 1, which is a confined, homogeneous groundwater aquifer. The walls of the wells are impermeable in aquifer 2, but perforated in aquifer 1. All three wells have a radius rw. The hydraulic conductivity of

(b) Two different porous materials are packed in a column with square cross-section 0.2 m 0.2 m. The hydraulic conductivities of the materials are K1 = 1 10 -4 m/s and K2 = 2.5 10 -4 m/s and their porosities are 1 = 0.3 and 2 = 0.25, respectively. The packed column is fully saturated with water. A layer of water of depth 0.1 m is maintained at

The diameter of a piston of the steam engine is 300 mm and the maximum steam pressure is 0.7 N/mm2. If the maximum permissible compressive stress for the piston rod material is 40 N/mm2, find the size of the piston rod.

The mast is carried in traffic light with a mass of 10 kg. Using Cartesian vectors, calculate the moment of the weight of the traffic light relative to the base of the pole in A. 3.65 m 5.50 m 30

a steel rod of 25 mm diameter is fitted inside a brass tube of 25 mm internal diameter and 375 mm external diameter. the projecting ends of the steel rod are provided with nuts and washers. the nuts are tightened up so as to produce a pull of 5 kn in the rod. the compound is then placed in a lathe and the brass is turned down to 4 mm thickness.

The weight of the uniform concrete layer is 5500 N. Layer, shown in the figure pull in each of the three parallel holding cables determine the strength A TA A TC 0.6 m TB 0.6 m 0.6 m 0.3m. 0.3m ZM

1. Find the component of the force F shown in the figure below and express the force F a as a Cartesian vector.

F 100 lb 60 45

2. Two forces act on the hook as shown in the figure. Find the magnitude of F2 and its coordinate direction angles so that the resultant force FR acts along the positive y axis and has a magnitude of 800 N.

F2 120 y 60 45 Fi 300 N

4) For the given truss system, obtain the lateral and vertical displacements at point B under the effect of the given force. (A 10 cm, A2 5 cm, E 2.1 x 105 Nmm) 1 m B 14.14 kN

Q2 . a) Determine the reactions at the two supports. [4 marks] b) Obtain the shear force equations for the three sections of the beam. [9 marks] c) Obtain the bending moment equations for the three sections of the beam. [4 marks] d) Draw the shear force diagram. [3 marks] e) Draw the bending moment diagram. [5 marks] f) Determine the maximum

Q2. The beam ADCB carries the loading shown in figure Q2. 10 kN 3 kNm 100 mm 200 mm B D 1.5 m 1.5m 2.2 m Figure Q2 a) Determine the reactions at the two supports. (4 marks) b) Obtain the shear force equations for the three sections of the beam. 19 marks c) Obtain the bending moment equations for the three sections of the beam. 14 marks d) Draw

Q3. The state of plane stress shown in Figure Q4 is expected to occur in cast-iron machine base. Knowing that for the grade of cast-iron machine used sigma.vt=160 MPa and sigma.vc = 320 MPa , determine ; a) The normal stresses in the x and y directions [1 mark] b) The shearing stress in the x-y plane [ mark] c) The principal stresses [ 4 marks]

Q3. The state of plane stress shown in Figure Q4 is expected to occur in castiron machine base. Knowing that for the grade of castiron machine used our 160 MPa and oyc 320 MPa, determine 145 MPa 120 MPa Figure Q4 a) The normal stresses in the x and y directions I mark b) The shearing stress in the xy plane 1 mark c) The principal stresses 14

An axial centric force of magnitude P = 500 kN is applied to the composite block shown by means of a rigid end plate. Knowing that h =12 mm, a) Draw the free body diagram of rigid end plate [1 mark] b) Determine the normal stress in the brass core [6 marks] c) Determine the normal stress in the aluminium plate [6 marks] Page 3 of 4 Q2. The beam

Q1. An axial centric force of magnitude P 500 kN is applied to the composite block shown by means of a rigid end plate. Knowing that h12 mm, Brass core (E 105 GPa) Ahmtnum plutes (E 70 GPo) Rigid end plate 300 mm 40 mm a) Draw the free body diagram of rigid end plate l mark) b) Determine the normal stress in the brass core 6 marks) c) Determine

An oil tank is filled to a height of 7.5 m with an oil of specific gravity 0.9. It has a rectangular gate Im wide and 1.5 m high provided at the bottom of a side face. Determine the resultant force on the gate and also its point of action.

Three bars shown in the below figure are made of steel, brass and copper from left to right. The bars are connected to each other and fixed at both ends when the temperature is T1 = 12 ?C. Determine the force exerted on the rigid supports at both ends when the temperature becomes T2=28 ?C.

Steel Est 200 GPa ast 12(106)C Brass Ebr 100 GPa abr 21(106)C Ast 250 mm Abr 300 mm 500 mm 200 mm Copper Ecu 120 GPa acu 17(106)C Acu 615 mm2 100 mm

For the system shows in the figure below find the required power to pump 100 Ls of liquid (SG 0.85, kinematic viscosity 105 ms). The pump is operating at an efficiency 0.75. Pressure at point B is 200 kPa. Given data are Line 1 L 10 m, D 0.20 m, roughness 0.05 mm, K10.5, Kv 2 Line 2 L 500 m, D 0.25 m, roughness0.05 mm, Ke0.25, K2 1 K el

The owner of a workplace talked with similar workplace owners that had to close the workplace until June because of Corona virus. She collected the data and analyzed the closure times of the workplaces. She estimated that the closure times were exponentially distributed with the average closure time 40 days. She evaluated that still there is a

The Gambrel truss shown in Fig. P6-88 supports one side of a bridge; an identical truss supports the other side. Floor beams carry vehicle loads to the truss joints. Calculate the forces in members BC, BG, and DE when a truck having a mass of 3500 kg is stopped in the middle of the bridge as shown. The center of gravity of the truck is 1 m in

A 2 m B H G 2m 2 m 3 m 3m F 2 m E 2 m 3 m

The circuit will have 2 independent AC voltage sources, 4 independent AC current sources, 8 resistors, 4 coils, 5 capacitors, 3 dependent sources (voltage-dependent current, current-dependent voltage). The circuit will have at least 6 closed loops. No circuit elements in the circuit will be connected in series or in parallel with the circuit

The pressure rating of the components in a hydraulic system is 1000 psi. The system contains a hydraulic motor to run a 10 inch radius drum at 30 rpm to lift a 1000 lb weight W, as shown in Fig.05. Determine the flow rate in units of gpm and the horsepower of the motor.

A pump supplies oil at 25 gpm to a 1.5 inch diameter double-acting hydraulic cylinder. If the load is 1200 lb (extending and retracting) and the rod diameter is 3.25 inch, find the following: i. Hydraulic pressure during the extending stroke ii. Piston velocity during the extending stroke iii. Cylinder horsepower during the extending stroke

Problem determine Suitable pipe Sizes for the System Shown below, Copper pipe is to be used, 3 m Cold Water Storage Tank 5 m 7 m wC WHB Bath Bath WHB wC 2m 7 m. 7m 3 m WC WHB Bath Bath WHB 3 m WC WHB Bath Bath WHB

In process control system design ,it is imperative to observe 5 element in the design.Name and describe in detailed the five element

A solar photovoltaic panel with dimension (x t) 1.5 m X 0.5 m X 0.02 m is mounted on top of a roof as shown in Figure Q2. The surface temperature of the panel and the ambient temperature are measured to be at 65 C and 35 C respectively. (a) During a windy day with wind speed of 20.5 m/s in parallel direction of the width of the panel, determine

Hightec Toy Manufacturing Company Limited is planning to purchase an injection machine for 3,000,000. The machine has an estimated life of 4 years. It is estimated that the machines maintenance expenses are around 10,500 per year and an operator will be employed at a wage of 160,000 per year to operate the machine. Hightec expects to generate

Given the following table displaying the logical connections of activities and the time estimates of a construction project Time (Days) Activity b Precedence a A 5 11 11 10 10 10 C 5 8 D 1 7 13 A E 4 4 10 B F 4 7 10 B G 2 2 B 6 6 C I 2 8 14 G,H J 1 4 7 D.E a. Construct the network diagram for the project. Also, calculate the EST and LST of the

1. A DC shunt motor, with supply voltage of 220V which rotates at 1000rpm for driving a mechanical load. The armature current through the rotor is 20A. Armature resistance is 0.32. a) Calculate the induced emf (E1) in the armature. 6 marks In order to increase the speed to 1250rpm, the motor is now under flux control. The flux is decreased to 75

The link lengths, coupler point location, and the values of ? 2 , ? 2 , and ? 2 for the same fourbar linkages as used for position and velocity analysis in Chapters 4 and 6 are redefined in Table P7-1 (p. 380), which is the same as Table P6-1 (p. 328). The general linkage configuration and terminology are shown in Figure P7-1 (p. 380). For the

Row Link 1 Link 2 Link 3 Link 4 0 0 0 0 0 a e f j KIER m n 67380 80 Saa NOO55 056777 136788 ONSO9 5 6 20 4 20 4 9 2 9 10 8 8 10 10 8 10 2 5 10 10 99866690 10 5 10 7 7 8 6 0 30 85 45 25 75 15 25 50 80 33 88 60 50 120 002 10 12 15 24 50 45 100 65 25 25 80 90 75 15 02 0 5 10 4 10 50 18 25 25 40 30 20 5 65 Rpa 6 9 10 5 9 10 4 6 9 1 10 5 10

A shrink-fit process has been used to enhance the pressure carrying capacity of a cylinder. During the process, two concentric cylinders are shrunk fitted together to form a composite open-ended cylinder. Before the shrink-fit process, the inner cylinder has an inner radius of 50 mm and outer radius 75.025 mm, while the outer cylinder has an inner

3. (a) A structural member, which is a made from a material with a uniaxial stress of Y = 400 MPa, is subjected to a state of plane stress. The stresses at a critical point in the member when the design loads are applied are given by: x = 90 MPa, y = 55 MPa and xy = 40 MPa. If the structural member fails by plastic yielding when the design loads

(b) A linear elastic material is subjected to a state of plane stress. The stress state at a certain point in the material is shown in Figure Qib. (i) Determine the magnitude of the principal stresses and maximum shear S marks stress Determine the magnitude of the direct stress acting on the plane of maximum shear. (ii) 3 marks) (i) Determine the

2. The surface strains at a point on a reactor pressure vessel are to be determined using electrical resistance strain gauges. The principal strain directions at the point are known, but it is not convenient to attach strain gauges in these directions. However, it is possible to attach gauges at 30 and 60 anticlockwise from the direction of the

R R R R (i) Initial choice (ii) Alternative A (iii) Alternative B ,the stages of deformation, and the corresponding evolution of the shear stress, in the solid circular shaft as the applied torque is increased towards its ultimate value. 8 marks A thinwalled hollow circular tube (Figure Q4b) with mean radius R and uniform (b) wall thickness of t

A grduate engineer has been tasked with the job of designing a canopy steel frame. A member ABC of the steel frame has the configuration similar to that shown in Figure Q3b The member has a uniform solid circular crosssection with a diameter d 50 mm and made from aluminium alloy with Youngs modulus E70 GPa and Poissons ratio v0 25. The maximum

(a) A solid circular shaft is subject to pure torsion. In your own words, describe the stages of deformation, and the corresponding evolution of the shear stress, in the solid circular shaft as the applied torque is increased towards its ultimate value. 8 marks

ssessment Questions In your own words, compare and contrast plane stress and plane strain conditions. (a) 5 marks

L 3 = 2.2m , W 1 = 7kN

If not specified in the questions, use E 210.0 GPa, v 0.3. 1 Figure 1 shows a beam ABCD such that AB 2.5 m, BC 3 m and CD L m. CLO3 It is simply supported at B and C and caries linearly increasing nonunifomly distributed load form 0 to Wi, over AB, uniformly distrbuted load 30 kN, over BC and linearly reducing nonuniformly distributed load

= 2600 Kgm 3 , L 2 = 4.1m , t = 8.3mm

Q3 An open channel ABCD is used to contain a liquid of mass density p, as shown in Figure 4. It is made of steel and simply supported at B and C. It has a cross section shape and CLO3 axis direction as shown in Figure 5. The cross section is symmetrical about z axis. The beam has dimensions AB 2.5 m and BC L2 and CD 3 m. Under normal conditions,

SX = 223Mpa , SY = -20Mpa

2. Figure 2 shows a tubular joint subjected to moment M and P. Due to these CLO4 loads, an element of the joint in xy plane ABCD has stress system shown in Figure 3. The values of the stresses are ox SX, Gy SY, and txy 45 MPa. The values and units of measure for the stresses are as given in the data sheet. a) Construct Mohrs circle for the

(10 marks) Q2 If a thin cylinder has tension and torsion from inside find the principal stresses and maximum shear stress if you know that : Os-60N/mm, 0-3e N/mm, t=45 N/mm ? (20 marks) ....

(10 marks) Q2 If a thin cylinder has tension and torsion from inside find the principal stresses and maximum shear stress if you know that Os60Nmm, 03e Nmm, t45 Nmm (20 marks) ....

Assume that you are designing an experiment in a constant volume reactor to test the accuracy of the reaction kinetics (for t=0, CA=CAo, CB=CBo CR= CS=0). The concentration of A is measured at defined intervals during reaction. Which method should be selected to test the reaction kinetics? Explain

Assume that you will design a flight controller for a quadcopter. Investigate and report below items. The items represent open-ended questions. Briefly, conduct a survey on the flight controllers of quadrotors and explore a design path which can be followed by you when you build your own flight controller. a) Modeling methods and tools of

At steady state, the temperature profile in a laminated system appears thus Material 1 Material 11 530K 310K 0.5m 0.3m Determine the thermal conductivity of II if the steadystate heat flux is 12.6 x 10 W m and the conductivity of I is 52 W m K.

Forced damped vibrations (3) A machine part having a mass of 2.5 kg vibrates in a viscous medium. A harmonic exciting force of 30 N acts on the part and causes a resonant amplitude of 14 mm with a period of 0.22 second. (i) Find the damping coefficient. (0.075 Ns/mm) ii) If the frequency of the exciting force is changed to 4 Hz, determine the

An unalloyed steel made cutting tool used for machining aluminium automobile parts has been found to work well, but you do not know the steel's composition. On the other hand, there is an urgent need for purchasing the cutting tool, for which you need to know the carbon % of the existing unalloyed steel cutting tool. The microstructure of the

As an engineer you want to design a mechatronic system that is constructed as a combination of a second order electromechanical subsystem and a first order electronics subsystem. You also desire to design a digital control closed-loop system for getting the velocity of this system to the predetermined reference level. Input and output of the

Design a supercritical Rankin cycle with two reheaters that operates at 30 MPa and 350 C, the reheat pressures are 20% from each previous pressure, and the reheat temperatures are 350 and 320 C respectively. The condenser pressure is 10 KPa. 1- Draw the T-S diagram 2- Find the thermal efficiency

TA Critical point

In Fig Q3, a D.C. shunt motor takes an armature current laj of 30A from a 500V D.C. Q3 supply. It runs at N1 1500 revmin. Its total armature resistance Raj is 0.22. The motor speed is decreased by the use of armature resistance control. (a) Calculate the induced emf El of the motor at N1 1500 revmin. (5 marks) (b) Calculate the induced emf E2 of

Q2 Referring to Fig. Q2, the parameters of the ideal transformer circuit is listed in Table Q2 as follows R1 160k2 ZL 20 j15 2 200 Vs 800VZ0 Table Q2 R1 n1 Vs V1 V2 Fig. Q2 (3 marks) (a) Calculate the current (I2) through the load ZL (b) Calculate the voltage (V2) across the load Z1. (2 marks) ww

In Fig Q3, a D.C. shunt motor takes an armature current laj of 30A from a 500V D.C. Q3 supply. It runs at N1 1500 revmin. Its total armature resistance Raj is 0.22. The motor speed is decreased by the use of armature resistance control. (a) Calculate the induced emf El of the motor at N1 1500 revmin. (5 marks) (b) Calculate the induced emf E2 of

A power generation company uses a 3phase power generator as illustrated in Fig. Q1 to supply electric power of positive sequence to its consumers. The power distribution circuit is illustrated in Fig. Q1. Q1 () Calculate the line voltages Vbc in polar form (2 marks) Calculate the phase current (Ibn) in polar form (b) Calculate the total active

Q4 () A 3phase induction motor having a synchronous speed of 1200rpm draws 80kW from a 3phase feeder. The copper losses and core losses in the stator amount to 5kW. If the motor runs at 1152rpm, calculate the rotor input power (i) (ii) (iii) the gross mechanical power output (2 marks) (2 marks) the rotor copper losses (2 marks) (vi) the net

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Q2. a) An Analog Voltmeter (VOM) is used to measure the DC voltage of an electric circuit. The reading of the VOM is shown in Figure Q2a. Given the Full Scale Range of this VOM is set at 50V, the accuracy of this VOM is 2.5 of full scale. (i) What is the value of the VOM reading as shown in Figure Q2a (ii) Calculate the error by this VOM voltage

Q1. a) Refer to Figure Qla, given E 10 V, R 1 k2. (i) Draw a circuit diagram to show how an ammeter is connected as to measure the current pass through the resistor R. Given the ammeter has an internal resistance of 100Q, what is the value of the (2 marks) (ii) current measured (3 marks) (iii) Calculate the loading effect (in of error) of this

Q3. a) A potentiometer is used to detect the linear movement of a table. The circuitry is shown in Figure Q3a. Given VDc 10 V, L 500 mm. Displacement of table A R2 VDC Vt Potentiometer C Figure Q3a (i) If Vt 3V, calculate the displacement of the table. (ii) If the displacement of the table is 120 mm, what will be Vt measured (iii) Determine the