Q.1(a)What is centre of buoyancy? Explain stable and unstable equilibrium.
(b)A plate having an area of 0.8 m2 is sliding down the inclined plane at 45o to the horizontal with a velocity of 0.40 m/sec. There is a cushion of fluid 2 mm thick between the plane and plate. Find the viscosity of fluid of the weight of plate is 300 N.
Q.2(a)What is vapour pressure? Discuss the importance of saturation vapour pressure.
(b)When a pressure of 21 MN/m2 is applied to 90 litres of a liquid, its volume decreases by one litre. Find the bulk modulus of liquid and identify it.
Q.3(a)Explain the following types of flow with suitable examples – laminar flow, turbulent flow, uniform and non-uniform flow, rotational and irrotational flow, compressible and incompressible flow.
(b)Water is flowing through a pipe having diameters 550 mm and 350 mm at the bottom and upper ends respectively. The intensity of pressure at these ends are 300 kN/m2 and
150 kN/m2. Determine the difference in datum head of the rate of flow through the pipe is 70 lit/sec.
Q.4(a)Explain how following coefficients are determined experimentally when water flows through orifice : coefficient of contraction, coefficient of velocity, coefficient of discharge and coefficient of resistance.
(b)A 1.0 m diameter circular tank contains water upto 3.5 m. At the bottom of tank an orifice of 30 mm is provided. Find the height of water above the orifice after 2.0 minutes.
Q.5(a)Explain how the discharge in open channel is measured.
(b)A venture flume is 1.2 m wide at enterance and 0.60 m in the throat. Neglecting hydraulic losses in the flume. Calculate the flow of the depths at the enterance and throat are 0.60 and 0.55 respectively.
Q.6(a)What is Darcy-Weisbach equation. Find the loss of head due to friction in a pipe carrying water. The pipe is 500 m long and 20 cm in diameter. The discharge through the pipe is 0.05 m3/sec. Take f = 0.035.
(b)Two reservoirs are connected by a pipe line consisting of two pipes, one of 20 cm diameter and 5 m length and other of diameter 2.25 cm and 15 m length. If the difference of water levels in the two reservoirs is 5 m, calculate the discharge. Take f = 0.035.
Q.7(a)Derive the equation for flow through a nozzle at the end of a pipe.
(b)A 3000 m long pipeline is used for transmission of power. 150 kN power is to be transmitted through the pipe in which water having a pressure of 3000 kN/m2 at inlet is flowing. If the pressure drop over the length of pipe is 800 kN/m2 and f = 0.006 find diameter of pipe and efficiency of transmission.
Q.8(a)Explain Chezy and Manning’s equations.
(b)A trapezoidal canal has a bottom width of 3.5 m and side slopes 1 V to 2 H. If the bed slope is 1 in 4000 and depth of flow is 2 m. Find discharge by various equations known to you.
Q.9(a)A circular sewer with 0.6 m in diameter is laid at a slope of 1 in 300. What is maximum velocity of flow and corresponding discharge. Take C = 60.
(b)Show that hydraulic mean depth of a trapezoidal canal having best proportion is half of the maximum depth.
Q.10Write short notes on following :
(i)Coplaner forces,
(ii)Velocity distribution in circular pipe,
(iii)Syphon technique, and
(iv)Minor losses in pipes.
Q.1(a)Select the correct answer from the given Four alternatives.
(i)Select the correct answer from the given four alternatives :
(a)Faraday’s region
(b)Crooke’s gap
(c)Forbidden gap
(d)Fermi gap
(ii)Ina reverse bias mode, a diode offers :
(a)Very high capacitance
(b)Very high resistance
(c)Very low resistance
(d)Very low inductance
(iii)The efficiency of a full wave rectifier is :
(a)81.2%
(b)40.6%
(c)20.3%
(d)90.6%
(iv)In a common emitter configuration of a transistors we get :
(a)Low power gain
(b)Unity power gain
(c)Zero power gain
(d)High power gain
(v)Current gain for a transistor in common base configuration is :
(a)Just less than 1
(b)Just greater than 1
(c)Much lesser than 1
(d)Much greater than 1
(vi)Decimal equivalent of 0.1011 is :
(a)0.5875
(b)0.6875
(c)0.6855
(d)0.5855
(vii)When a forward bias is applied to a p-n junction, it :
(a)raises the potential barrier
(b)reduces the majority carrier current to zero
(c)lowers the potential barrier
(d)none of the above
(b)State ‘true’ ‘or false’ for the given statements :
(i)An SCR has an advantage of high switching speed over electromagnetic relay.
(ii)A series wound DC motor can not exert a high starting torque.
(iii)Multi channel displaying capacity is possible in dual beam oscilloscope.
(iv)There is very high electric field in the depletion layer of a p-n junction.
(v)In a common base amplifier the output signal is 180o out of phase with the input signal.
(vi)When a diode is forward biased its thickness of depletion layer is decreased.
(vii)Phosphorus is an example of a donor type impurity for doping in semiconductors.
Q.2(a)Explain the working of Half wave rectifier clearly showing its output & input wave forms.
(b)What is a Zener diode? Draw its V-I characteristics.
Q.3(a)Let = 0.97for a BJT. Determine its . For the same transistors if the emitter current is
1 milliampere, determine the base and collector currents.
(b)Draw the input and output characteristics of an amplifier in common emitter mode.
Q.4The Figure 1 shows the two waveforms are fed to the two inputs of the NAND gate. Draw the output waveform.
Figure 1
Q.5(a)How can you make a AND gate using ‘OR’ gates only? Explain it.
(b)Write the truth table for a NAND gate. Connected as shown in Figure 2.
Figure 2
Q.6Explain the working principle of DC motor as an actuator.
Q.7Discuss single phase AC motor as an actuator.
Q.8Discuss SCR with clearly explaining its voltage current characteristics and Voltage safety factor.
Q.9(a)With the help of a diagram explain the working of a monochromatic television transmitter circuit.
(b)A p-n photodiode is fabricated from a semiconductor with band gap of 2.8 eV. Can it detect a wavelength of 6000 nm?
Q.10Write short notes on of the following :
(i)Function elements of a generalized measuring system
(ii)LVDT
(iii)Turbine flow meter
(iv)Optical transducer
(v)PLC and its applications
Q.1Discuss the role of managers in the effective management of an organization.
Q.2Describe the various different levels of management.
Q.3Write about decision making process with the help of suitable examples.
Q.4What are preventive measures for safety in a manufacturing company? How preventive measures are effective in avoiding accidents?
Q.5What is the span of control? Discuss the factors influencing span of control by taking suitable example of any organization.
Q.6Define coordination with the help of example. Explain how coordination is different from departmentation.
Q.7Define leadership. Discuss major qualities of a good leader. Also discuss his/her functions.
Q.8(a)What do you understand by central safety committee? Describe the roles of central safety committee.
(b)What are various protective devices? Discuss the significance of protective devices in an organization.
Q.9(a)Describe oral and non-verbal communication.
(b)Describe Theory X and Theory Y with the help of suitable examples.
Q.10Write short notes following :
(i)Oral and Non-verbal Communication.
(ii)Workmen’s Compensation Act.
Q.1(a)The minimum pressure and temperature in an Otto cycle are 100 kPa and 27C. The amount of heat added to the air per cycle is 1500 kJ/kg.
(i)Determine the pressures and temperatures at all points of the air standard Otto cycle.
(ii)Also calculate the specific work and thermal efficiency of the cycle for a compression ratio of 8 : 1.
Take for air : cv = 0.72 kJ/kg K, and = 1.4.
(a)An air standard Otto cycle has a volumetric compression ratio of 6, the lowest cycle pressure of 0.1MPa and operates between temperature limits of 27C and 1569C.
(i)Calculate the temperature and pressure after the isentropic expansion (ratio of specific heats = 1.4).
(ii)Since it is observed that values in (i) are well above the lowest cycle operating conditions, the expansion process was allowed to continue down to a pressure of 0.1 MPa. Which process is required to complete the cycle? Name the cycle so obtained.
(iii)Determine by what percentage the cycle efficiency has been improved.
Q.2(a)A diesel engine has a compression ratio of 15 and heat addition at constant pressure takes place at 6% of stroke. Fine the air standard efficiency of the engine. Take for air as 1.4.
(b)An engine with 200 mm cylinder diameter and 300 mm stroke works on theoretical Diesel cycle. The initial pressure and temperature of air used are 1 bar and 27C. The cut-off is 8% of the stroke. Determine :
(i)Pressures and temperatures at all salient points.
(ii)Theortical air standard efficiency.
(iii)Mean effective pressure.
(iv)Power of the engine if the working cycles per minute are 380.
Assume that compression ratio is 15 and working fluid is air.
Consider all conditions to be ideal.
Q.3(a)An I.C. engine operating on the dual cycle (limited pressure cycle) the temperature of the working fluid (air) at the beginning of compression is 27C. The ratio of the maximum and minimum pressures of the cycle is 70 and compression ratio is 15. The amounts of heat added at constant volume and at constant pressure are equal. Compute the air standard thermal efficiency of the cycle. State three main reasons why the actual thermal efficiency is different from the theoretical value.
Take for air = 1.4.
(b)Find the thermal efficiency of a Carnot engine whose hot and cold bodies have temperature of 154C and 15C respectively.
Q.4(a)Discuss the relative advantages and disadvantages of internal combustion and external combustion engines.
(b)(i)State the function of a carburetor in a petrol engine.
(ii)Describe a simple carburetor with a neat sketch and also state its limitations.
Q.5What is the function of a governor? Enumerate the types of governors and discuss with a neat sketch the Porter governor.
Q.6(a)Compare the relative advantages and disadvantage of four stroke and two stroke cycle engines.
(b)Explain the phenomena of knocking in S.I engine. What are the different factors which influence the knocking? Describe the methods used to suppress it.
Q.7(a)Why do we feel the necessity of cooling an I.C. engine.
(b)Explain briefly the following methods of cooling I.C.engines:Air cooling, Liquid cooling.
Also state their relative advantages and disadvantages
Q.8(a)What do you mean by ‘octane number’ and ‘cetane number’ of fuels? How are they determined?
(b)A 4-cylinder petrol engine works on a mean effective pressure of 5 bar and engine speed of 1250 r.p.m Find the indicated power developed by the engine if the bore is 100 mm and stroke 150 mm.
Q.9(a)A 4-cylinder, four-stroke diesel engine runs at 1000 r.p.m. The bore and stroke of each cylinder are 100 mm and 160 mm respectively. The cut-off is 6.62% of the stroke. Assuming that the initial condition of air inside the cylinder are 1 bar and 20C, mechanical efficiency of 75%, calculate the air-standard efficiency and brake power developed by the engine.
(b)Describe with a neat sketch the construction and working of a single-stage
single-acting reciprocating air compressor.
Q.10(a)A single-stage single-acting air compressor running at 1000 r.p.m. delivers air at
25 bar. For this purpose the induction and free air conditions can be taken as 1.013 bar and 15C, and the free air delivery as 0.25m3/min. The clearance volume is 3% of the swept volume and the stroke bore ratio is 1.2 : 1. Calculate the bore and stroke and the volumetric efficiency of this machine. Take the index of compression and expansion as 1.3. Calculate also the indicated power and the isothermal efficiency.
(b)What do you mean by ‘gas turbine’? How are gas turbines classified?
Q.1Define welding. What are the various types of welding processes? Elaborate on each method with suitable example of welding process.
(10)
Q.2Define gas welding. What is the principle of gas welding? List out the equipments required for Oxy-Acetylene welding. Explain each with sketches wherever necessary.
(10)
Q.3What is TIG and MIG welding? Differentiate between TIG and MIG welding.
(10)
Q.4Write short notes on :
(i)Brazing,
(ii)Braze welding, and
(iii)Soldering.
Describe the advantages and disadvantages of Braze welding.
(10)
Q.5What is a sawing machine? What are the types of sawing machines? List out the precautions to be taken, while performing cutting with Hecksaw Machine.
(10)
Q.6(a)Compare extrusion and rolling processes.
(b)What is press forging? How does it differ from drop forging?
(5 + 5 = 10)
Q.7What is grinding? What is the purpose of grinding? Elaborate on defects and remedies in grinding.
(10)
Q.8What is lapping? Classify the lapping processes. Describe the lapping compounds and tools. Also list out some lapping applications.
(10)
Q.9Write short notes on the following :
(i)Metal spraying, and
(ii)Electroplating.
(5 + 5 = 10)
Q.10Write short notes on the following :
(i)Powder metallurgy, and
(ii)Types of grinding machines.
(5 + 5 = 10)
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