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Sample Question Paper Type I B.E. FIRST YEAR EXAMINATION Elements of Mechanical Engineering

Instructions (1) Answer all questions (2) Answer letters must be typed in the student response sheet or blackened in the scanner sheet. (3) Figures to the right indicate full marks of the sub question. (4) Use of reference tables and formula sheet available on computer is permissible.

1.

For a superheated steam given that Steam Pressure in bar Degree of superheat in oC Weight of steam in kg

= 12.7 = 46 =6

Select the Correct Answer for: <1> Temperature of superheat in oC. [A] 357 [B] 440

[C]

236.5

[D]

386.9

<2> Enthalpy of steam in KJ/kg. [A] 4250.9 [B]

2880.8

[C]

3799.5

[D]

3064.5

<3> Total enthalpy of steam in KJ. [A] 24286.8 [B]

17284.7

[C]

34079.1

[D]

19993.6

<4> Volume of steam in cum/kg. [A] 0.17 [B]

0.219

[C]

0.097

[D]

0.086

<5> Total volume of steam in cum. [A] 0.659 [B]

1.022

[C]

1.291

[D]

1.428

[C]

2839.8

[D]

2664.4

<6> Internal energy of steam in kJ/kg. [A] 4679.6 [B] 3681.6

2.

For a 2 Stroke 1 Cylinder Diesel Engine Given that Mean Effective Pressure in bar Area in sq cm Engine Speed in rpm Indicated Power in kW Fuel Consumption in litres/hour

= 22 = 122 = 600 = 39 = 11.7647058823529

3.

For a two cylinder single acting reciprocating compressor Given that Inlet or suction pressure in Mpa Inlet volume in cum/minute Inlet temperature in oC Delivery pressure in bar Index of adiabatic compression Gas constant in J/kgK

= 0.101 =9 = 23 =8 = 1.4 = 287

Select the nearest Correct Answer for:

4.

<1> Free air delivered (at 1.01325 bar 15 oC) in cum/min. [A] 15.27 [B] 4.522 [C]

8.729

[D]

16.629

<2> Delivery air temperature in oC. [A] 1776.2 [B]

705.1

[C]

950.5

[D]

1295.3

<3> Mass of air taken in cylinder in kg/min. [A] 20.76 [B] 12.44

[C]

16.82

[D]

10.7

<4> Indicated power in kW. [A] 61.1

[C]

42.8

[D]

38.2

[B]

68.8

Following Properties for Air are given for Constant Volume Heating Process Initial Pressure in bar Initial Volume in cum Initial Temperature in K Final Pressure in MPa

= 26.1 =3 = 501.5 = 2.72

Select the Correct Answer for: <1> Final Temperature in oC. [A] 287.8

5.

[B]

454.3

[C]

249.6

[D]

215.5

<2> Change in Internal Energy during Process in kJ. [A] 777.5 [B] 825

[C]

1231

[D]

730.4

<3> Heat Supplied during Process in J. [A] 1342500 [B] 439200

[C]

706000

[D]

825000

For a mixing of two streams at 0.03 kN/sqcm

Given that Dryness fraction of first stream Temperature of water in oC Mass of water mixing steam in kg/hour Internal diameter of steam pipe in cm Velocity of steam in the steam pipe in m/sec

= 0.96 = 25 = 432.4 = 18.7 = 30.1

Select the Correct Answer for:

6.

<1> Mass of steam of first stream in kg/hour. [A] 5113.09 [B] 6480.32

[C]

8159.25

[D]

3650.03

<2> Enthalpy of steam of first stream in kJ/kg. [A] 2638.1 [B] 1899.9

[C]

1612.7

[D]

3747.4

<3> Dryness fraction of mixture. [A] 0.59 [B]

[C]

0.59

[D]

0.99

0.87

For a Boiler Given that Steam pressure in bar gauge Dryness fraction Feed water Temperature in oC Heat supplied to steam in boiler per hour in KJ Weight of coal burnt per hour in kg Calorific value of coal in kJ/kg

=0 = 0.98 = 15 = 9140194 = 358 = 31510

Select the nearest Correct Answer for:

7.

<1> Steam generated per hour in kg. [A] 6465 [B] 1955

[C]

3560

[D]

3310

<2> Boiler Efficiency. [A] 0.55

[C]

0.64

[D]

0.81

<3> Equivalent evaporation from and at 100 oC in kg. [A] 11.31 [B] 15.76 [C]

6.93

[D]

6.77

<4> Factor of Evaporation. [A] 1.138

[B]

2.179

[C]

0.698

[D]

0.892

<5> Boiler Power in kW. [A] 102.22

[B]

166.59

[C]

280.25

[D]

190.13

[B]

0.75

For a 2 Stroke 8 Cylinder Petrol Engine

Given that Mean Effective Pressure in kN/sqcm Area in sq cm Engine Speed in rpm Indicated Power in kW Fuel Consumption in kg/hour

= 0.04 = 44 = 2600 = 99 = 22

Select the Correct Answer for: <1> Length of Stroke in mm. [A] 162

[B]

151

[C]

<2> Specific Fuel Consumption/IPhour in kg/hour/kW. [A] 0.439 [B] 0.312 [C]

270

[D]

124

0.222

[D]

0.178

8<1> During expansion for the same increase in volume the pressure drop is a greater in adiabatic process as compared to isothermal process b less in adiabatic process as compared to isothermal process c less in adiabatic process as compared to constant pressure process d none of these choices.

8<2> An open system is one in which a there is passage of energy across the boundary but not of mass b None of these choices possibility. c there is passage of energy and mass across the boundary d there is no passage of energy and mass across the boundary

8<3> If in a boiler the circulation of water is by convection currents which are set up during the heating of water, then the boiler is known as a externally fired boiler b natural circulation boiler c forced circulation boiler. d internally fired boiler

8<4> Energy which can be attributed to the position of a mass within a gravitational field is known as a Kinetic energy b Flow energy c Potential energy d Internal energy,

8<5>

The increase in cut-off ratio of a Diesel cycle with fixed compression ratio will a will not alter the air standard efficiency. b decrease the air standard efficiency c increase linearly the air standard efficiency d increase the air standard efficiency

8<6> The mechanical efficiency of an internal combustion engine is of the Order a 0.2 b 0.6 c 0.35 d 0.8

8<7> Which of the following engines is a compression ignition engine ? a steam engine b gas engine c petrol engine d diesel engine

8<8> Pumping power is equal to a total power produced - net power produced b net power produced c none of these choices d total power produced

8<9> A device which is used for pumping water into the boiler and also for heating the feed water is called a economiser b injector. c feed heater d feed pump

8<10> For the same compression ratio, which of the following cycles has the highest air standard efficiency? a Diesel cycle b c Otto cycle d Dual cycle.

9<1> Fuel injector is used with a spark ignition engines b steam engines c compression ignition engines d gas engines.

9<2>

In case of reciprocating compressor the performance is expressed as a isothermal work / indicated work b none of these choices c indicated work / isothermal work d adiabatic work / indicated work

9<3> The law which states that heat and work are mutually convertible is known as a zeroth law of thermodynamics b second law of thermodynamics c None of these choices. d first law of thermodynamics

9<4> Which one of the following gaseous fuel has highest calorific value based on volume? a carbon monoxide b methane c ethane d hydrogen

9<5> The diameter of the cylindrical shell of a Cornish boiler as compared to that of a Lancashire boiler is a none of these choices. b less c equal . d more

9<6> The increase in cut-off ratio of a Diesel cycle with fixed compression ratio will a increase the air standard efficiency b decrease the air standard efficiency c increase linearly the air standard efficiency d will not alter the air standard efficiency.

9<7> Work done in expansion is equal to the heat supplied in case of a non-flow isothermal process b None of these choices process. c non-flow constant volume process d non-flow constant pressure process

9<8> A boiler is said to be a fire tube boiler if a water passes through the tube and hot products of combustion from furnace are around the tubes b hot products of combustion pass through the tubes and water surrounds it c forced circulation of water takes place in the boiler. d none of these choices.

9<9>

Gas producers in which the steam-air mixture is forced by external means are known as a suction gas producers. b forced gas producers c pressure producers d free gas producers

9<10> The volumetric efficiency depends on a index of re-expansion b pressure ratio, clearance ratio and index of re-expansion process. c clearance ratio only d pressure ratio only

10<1> Equivalent evaporation from and at 100°C means a amount of water evaporated in kg/hour b amount of water evaporated per kg of fuel c amount of water evaporated from and at 100°C into dry saturated steam at atmospheric pressure d none of these choices.

10<2> The value of a gas constant for air in SI system is a 287 J/kg K b 287 kJ/kg K c 29.27 kJ/kg K d none of these choices

10<3> The clearance ratio for a single stage air compressor lies between a 4 to 10% b 10 to20% c more than 20%. d 1 to 2%

10<4> The compression ratio for a Diesel engine varies from a 25 to 40. b 6 to 10 c 10 to 12 d 13 to 25

10<5> A perpetual motion machine of the first kind (defined as a machine which produces power without consuming any energy) is impossible according to a first law of thermodynamics b zeroth law of thermodynamics c none of these choices. d second law of thermodynamics

10<6>

The sum of internal energy and pressure volume product is called a enthalpy b entropy c flow work d None of these choices

10<7> The fitting mounted on the boiler, whose function is to prevent the steam pressure in the boiler exceeding a fixed maximum pressure, is called a blow off cock. b stop valve c safety valve d fusible plug

10<8> In superheater the heat received by the working fluid is a latent heat only b superheat only c latent heat and superheat. d sensible heat only

10<9> The index of adiabatic operation, Y, is equal to a difference of two specific heats b sum of two specific heats. c product of two specific heats d ratio of two specific heats

10<10> Which one of the following fuels has the two calorific values ? a sulphur b carbon monoxide c carbon d hydrogen

Sample Question Paper Type II

B.E. FIRST YEAR EXAMINATION Elements of Mechanical Engineering

Instructions (1) Answer all questions (2) Answer must be typed in the student response sheet or blackened in the scanner sheet. (3) Figures to the right indicate full marks of the sub question. (4) Use of reference tables and formula sheet available on computer is permissible.

1.

Following Properties for Argon are given for Constant Pressure Compression Process Initial Pressure in kN/sq.m Initial Volume in cum Initial Temperature in oC Final Volume in cum Select the Correct Answer for:

= 2170 = 0.7 = 270.2 = 0.5

<1> Work done during Process in J. <2> Final Temperature in K.

2.

For a two cylinder single acting reciprocating compressor Given that Inlet or suction pressure in bar Delivery pressure in Mpa Compressor speed in r.p.m Stroke length to diameter ratio Index of compression Inlet volume per cycle in cucm Select the nearest Correct Answer for: <1> <2> <3> <4> <5> <6>

3<1>

Work done per cycle in J. Indicated power in kW. Swept volume of cylinder in cucm. Diameter of cylinder in cm. Stroke length in cm. Average piston speed in m/min.

= 1.02 = 0.7 = 2560 = 1.461 = 1.34 = 1801

According to first law of thermodynamics a net work cannot be produced during a cycle without some supply of heat b None of these choices. c net work can be produced during a cycle without some heat supply d net work cannot be produced during a cycle with some heat supply

3<2> The volumetric efficiency of a reciprocating compressor is defined as the ratio of a none of these choices b clearance volume to swept volume of the piston c swept volume to the total volume of the cylinder d free air actually delivered by the machine per minute to the swept volume by the piston per minute

3<3> Displacement work is equal to a ∫ Fdx b ∫pdV c None of these choices. d ∫Vdp

3<4> When the pressure in a car tire was checked at a temperature of 12°C, the tire gauge showed a reading of 1.75 bar, the atmospheric pressure being 1.013 bar. The temperature in the tire increases to 38°C, the gauge reading will be a 3.016 bar b 1.91 bar c 1.75 bar d 2.003 bar

3<5> The pressure ratio is defined as a swept volume to clearance volume. b clearance volume to total volume of the cylinder c clearance volume to swept volume of the piston d delivery pressure to suction pressure

3<6> The use of after cooler is to a none of these choices b reduce the volume of air c minimize the work of compression d cool the air

3<7> The clearance ratio for two-stage compression lies between a 1 to 2% in both cylinders b more than 10% in both cylinders. c 2 to 4o/o in both cylinders d 5 to I0°g in both cylinders

3<8> The mechanical efficiency of an air compressor is equal to a indicated horse power / shaft horse power b shaft horse power / indicated horse power c shaft horse power x indicated horse power d shaft horse power + indicated horse power

3<9> For a polytropic process pV^n = constant, the temperature and volume are related as a T1/ T2 ={ V2/ V1}^(n-1) b T1/ T2={ V1/ V2}^((n-1)/n) where n is the index of polytropic operation. c T1/ T2={V1/V2)^(n/(n-1)) d T1/ T2={ V1/ V2}^(n-1)

3<10> The volumetric efficiency depends on a index of re-expansion b pressure ratio, clearance ratio and index of re-expansion process. c clearance ratio only d pressure ratio only