new eme objectives

Introduction

Unit 1 (1) 1 bar =

(a) 760 cm of hg

(b) 76 cm of hg

(c) 0.76 cm of hg

(d) None of the above

(2) In the closed system , mass may

(a) Transfer

(b) Constant

(c) Both

(d) None of the above of the above

(3) In the open system. Energy may

(a) Transfer

(b) Constant

(c) Both


(4) In the closed system, energy may

(a) Transfer

(b) Constant

(c) Both


(5) In the open system, mass may

(a) Transfer

(b) Constant

(c) Both


(6) In the isolated system, mass may

(a) Transfer

(b) Constant

(c) Both


(7) Which represents the isolated system?

(a) Cylinder

(b) Boiler

(c) Cooker

(d) Thermos flask

(8) Ice and water is a

(a) Open system

(b) Closed system

(c) Adiabatic system


(9) Which is the heterogeneous system?

(a) Ice and water

(b) Boiler

(c) Ice


(10) The unit of density is

(a) kg/m3(b) m3(c) kg/m2

(d) kg/m

(11) The unit of specific volume is (a) kg/m3(b) m3(c) kg/m2

(d) kg/m

(12) Pabs =

(a) Pgauge + Patm

(b) Pgauge * Patm

(c) Pgauge - Patm


(13) Which is the intensive property?

(a) Pressure

(b) Mass

(c) Both


(14) Velocity is the

(a) Intensive property

(b) Extensive

(c) Both


(15) Volume is the

(a) Intensive property

(b) Extensive

(c) Both


(16) Which is the extensive property?

(a) Pressure

(b) Height

(c) Viscosity


(17) Unique condition of the system is called

a) Volume

(b) Boundary

(c) State


(18) Which is reversible process?

(a) Motion

(b) Electrolyses

(c) Electricity


(19) Frictionless motion is the

(a) Reversible process

(b) Irreversible process

(c) Both

(d) None of the above(20) Isothermal process is the

(a) Chemical process

(b) Electrical process

(c) Both


(21) Which is the irreversible process?

(a) Throttling

(b) Electrical

(c) Both


(22) Heat transfer is

(a) Volume process

(b) Heat process

(c) Transfer process


(23) Unit of energy is

(a) Joule

(b) Kg

(c) Joule/second


(24) Watt is the unit of

(a) Work

(b) Energy

(c) Power


(25)1 watt =

(a) 0.1 joule/sec

(b) 1.1 joule/sec

(c) 1 joule/sec

(d) 0.10 joule/sec

(26) Work is a

(a) Path function

(b) Point unction

(c) Both


(27) Heat and work are

(a) Motion phenomena

(b) Volume process

(c) Both


(28) Heat is a

(a) Low grade energy

(b) High grade energy

(c) Both


(29) Heat and work are

(a) Boundary phenomena

(b) Volume

(c) Both

(d) None of the above(30) High grade energy is

(a) Heat

(b) Work

(c) Both


(31) Thermodynamic is a

(a) Mechanical property

(b) Chemical property

(c) Both


(32) Zeroth law shows the concept of

(a) Pressure

(b) Temperature

(c) Both


(33) Charles law is

(a) PV = C

(b) V/T = C

(c) PV = MRT


(34) Boyles law is

(a) PV = C

(b) V/T = C

(c) PV = MRT


(35) Cp Cv =

(a) R

(b) V

(c) 0

(d) P

(36) H = U + PV is the equation of

(a) Enthalpy

(b) Entropy

(c) Pressure


(37) Cp / Cv =

(a) Gama

(b) Beta

(c) Alpha


(38) Cp =

(a) R / (-1

(b)R( / (-1

(c) Both


(39) Cv =

(a) R / (-1

(b) (

(c) Both

(d) None of the above (40) ( (Gama) =

(a)1 + R/Cv

(b)1 - R/Cv

(c)1 * R/Cv

(d) None of the above(41) Entropy is the process of

(a) Isothermal

(b) Adiabatic

(c) Both


(42) Entropy represents the

(a) First law

(b) Second law

(c) Zeroth law


(43) Plastic deformation is

(a) Irreversible process

(b) Volume process

(c) Stress process


(44) Electron spin is the component of

(a) Enthalpy

(b) Entropy

(c) R& C


(45) Work of a chemical cell is

(a) Positive

(b) Negative

(c) Both


(46) Work =

(a) pdv

(b) vdp

(c) Both


(47) In the NTP, the temperature is

(a) 0C

(b)15C

(c) Both


(48) In the STP, the temperature is

(a) 0C

(b)15C

(c) Both


(49) In the CGS system, the unit of force is

(a) Dyne

(b) m/s2

(c) Both

(d) None of the above(50) The Kgf is the unit of

(a) Pressure

(b) Mass

(c) Force

(d) None of the above(51) A definite area or a space where some thermodynamic process takes place, is known as(a) thermodynamic cycle

(b) thermodynamic process

(c) thermodynamic system

(d) thermodynamic law

(52) When neither mass nor energy is allowed to cross the boundary of a system, it is called

(a) closed system

(b) open system

(c) isolated system

(d) none of these

(53) Which of the following is the extensive property of a thermodynamic system?

(a) pressure

(b) volume

(c) temperature

(d) density

(54) Which of the following is an intensive property of a thermodynamic system?

(a) volume

(b) temperature

(c) mass

(d) energy

(55) Which of the following is not a thermodynamic property?

(a) pressure

(b) temperature

(c) heat

(d) specific volume

(56) Atmospheric pressure is equal to

(a) 1.013 bar

(b) 101.3 kN/m2(c) 760 mm of Hg

(d) all of these

(57) First law of thermodynamic deals with

(a) conservation of heat

(b) conservation of momentum

(c) conservation of mass

(d) conservation of energy

(58) Second law of thermodynamics defines

(a) heat

(b) work

(c) entropy

(d) internal energy(59) Kelvin Plancks law deals with

(a) conservation of work

(b) conservation of heat

(c) conservation of mass

(d) conservation of heat into work

(60) The principal constituents of a fuel are

(a) carbon and hydrogen

(b) oxygen and hydrogen

(c) sulphur and oxygen

(d) sulphur and hydrogen

(61) The fuel mostly used in boiler is

(a) brown coal

(b) peat

(c) caking bituminous coal

(d) non-caking bituminous coal

(62) Which of the following fuel has the highest calorific value?

(a) peat

(b) coke

(c) bituminous coal

(d) anthracite coal

(63) Steam coal is a

(a) pulverized coal

(b) brown coal

(c) caking bituminous coal

(d) non-caking bituminous coal

(64) Petrol is distilled at

(a) 65(C to 220(C

(b) 220(C to 345(C

(c) 345(C to 470(C

(d) 470(C to 550(C

(65) Which of the following statement is incorrect?

(a) The liquid fuels consist of hydrocarbons.

(b) The liquid fuels have higher calorific value than solid fuels.

(c) The solid fuels have higher efficiency than liquid fuels.

(d) All of the above

Unit 2(1) Joule Thomson expansion means

(a) throttling process

(b) isobaric process

(c) isothermal process

(d) hyperbolic process

(2) Nozzle converts energy to

(a) potential energy

(b) kinetic energy

(c) electrical energy

(d) none

(3) In the condenser , the work done is

(a) Infinite

(b) Zero

(c) One

(d) None

(4) Zeroth law is related to

(a) Pressure

(b) Volume

(c) Temperature

(d) None

(5) In the isothermal process

(a) (a)dH =0

(b) (b)dH =1

(c) (c)dH=2

(d) (d) none

(6) Constant pressure process follows

(a) Boyles law

(b) Charles law

(c) Both

(d) None

(7) Isothermal process is

(a) Parabolic process

(b) Hyperbolic process

(c) Both

(d) None

(8) In the polytropic process

(a) PV = C

(b) PV = 0

(c) Both

(d) None

(9) specific heat of water is

(a) 1

(b) 0.1

(c) 0.97

(d) None

(10) The value of atmospheric pressure

(a) 1.033 kg/cm2(b) 1.01bar

(c) Both

(d) None(11) Temperature of a system is

(a) A thermodynamic property

(b) An extensive property

(c) Intensive property

(d) None

(12) for ideal gas the mass of gas is

(a) 1

(b) 0

(c) Both

(d) None

(13) for an ideal gas the ratio PV / RT

(a) is zero

(b) tends to zero

(c) is unity

(d) none

(14) The value of specific heat at constant pressure as compared to that the constant volume is

(a) More

(b) Less

(c) Both

(d) None

(15) In a throttling process

(a) W = 0

(b) E = 0

(c) H = 0

(d) All of the above

(16) Adiabatic bulk modules is y times the isothermal bulk module for

(a) Real gas

(b) Perfect gas

(c) Liquids

(d) All fluids

(17) If cycle dQ / T > 0, the cycle is

(a) Reversible

(b) Irreversible

(c) Impossible


(18) Number of the triple point in pure substance is

(a) 0

(b) 1

(c) 2

(d) 3

(19) Entropy of water at 0C is assumed to be

(a) 0

(b) 1

(c) -1

(d) None

(20) For an irreversible process, net entropy change is

(a) Zero

(b) Negative

(c) Positive

(d) None(21) At critical point, the enthalpy of vaporization is

(a) Maximum

(b) Minimum

(c) Zero

(d) None

(22) The isothermal and adiabatic process are

(a) Reversible

(b) Irreversible

(c) Both

(d) None

(23) Number of process in a rankle cycle is

(a) 3

(b) 4

(c) 5

(d) 6

(24) Carnot cycle has maximum efficiency for

(a) Petrol engine

(b) Diesel engine

(c) Reversible engine

(d) Irreversible engine

(25) Efficiency of a carnot cycle is given by

(a) (T1+T2) / T1

(b) (T1-T2) / T1

(c) T1/ (T1+T2)

(d) T1/(T1-T2)

(26) Air standard efficiency of stirling cycle as compared to carnot cycle is

(a) Less

(b) More

(c) Same

(d) None

(27) The comparison ratio of diesel engine is

(a) 3 to 6

(b) 5 to 8

(c) 15 to 20

(d) 20 to 30

(28) In carnot cycle heat is rejected at constant

(a) Volume

(b) Pressure

(c) Temperature

(d) Entropy

(29) Comparison ratio for petrol engine is

(a) 3 to 6

(b) 5 to 8

(c) 15 to 20

(d) 20 to 30

(30) The efficiency of ericson cycle as compared to carnot cycle is

(a) Same

(b) More

(c) Less

(d) None(31) Ericson cycle is

(a) Reversible

(b) Semi-reversible

(c) Irreversible

(d) None

(32) Efficiency of Joule cycle as compared to Carnot cycle is

(a) More

(b) Less

(c) Equal

(d) None

(33) The least efficient cycle is

(a) Carnot cycle

(b) Carnot cycle

(c) Otto cycle

(d) Ericson cycle

(34) In Joule cycle, heat is rejected at constant

(a) Volume

(b) Pressure

(c) Temperature

(d) Entropy

(35) Rank of coal is based on

(a) Ash

(b) Moisture

(c) Fixed carbon and heating value

(d) None

(36) Petrol is distilled at

(a) 65C to 220C

(b) 225C to 350C

(c) 345C to 450C

(d) 470C to 550C

(37) In the heat engine

(a) th = Wnet / qa(b) th = 0

(c) Both

(d) None

(38) C.O.P of heat pump is

(a) 1 + (C.O.P.)ref(b) 0

(c) Both

(d) None

(39) In the Kelvin-plank statement both laws are satisfied or not?

(a) Yes

(b) No

(c) Both

(d) None

(40) Carnot cycle is

(a) Irreversible process

(b) Joule process

(c) Reversible process

(d) None(41) In third law of thermodynamic, the temperature is

(a) 0

(b) Infinite

(c) Both

(d) None(42) Third law is known as

(a) Nernst theorem

(b) Substance pheonema

(c) Both

(d) None

(43) Gas having calorific value is

(a) A coal gas

(b) Mono gas

(c) Both

(d) None(44) If the temperature remains constant, the volume of a given mass of a gas is inversely proportional to the pressure. This is known as(a) Charles law

(b) Boyles law

(c) Joules law

(d) Gay-Lussacs law

(45) The state of a substance whose evaporation from its liquid state is complete, is known as

(a) steam

(b) vapour

(c) air

(d) perfect gas

(46) The characteristics equation of a gas is

(a) pv = constant

(b) pv = mR

(c) pv = mRT

(d) pv = RTm(47) The value of gas constant (R) is

(a) 287 J/kgK

(b) 28.7 J/kgK

(c) 2.87 J/kgK

(d) 0.287 J/kgK

(48) The value of universal gas constant (Ru) is

(a) 8.314 J/kgK

(b) 83.14 J/kgK

(c) 831.4 J/kgK

(d) 8314 J/kgK

(49) The gas constant (R) is equal to the _____________ of two specific heats.

(a) sum

(b) difference

(c) product

(d) ratio

(50) The specific heat at constant pressure is ____________ that of specific heat at constant volume.

(a) equal to

(b) less than

(c) more than

(d) none of the above

Unit 31. Which of the following cycles is used in thermal power plant?

(a) Brayton

(b) Carnot

(c) Ericsson

(d) Rankine

2. In a Carnot Engine, when the working substance rejects its heat to sink, the temperature of sink

(a) remains same

(b) decreases

(c) increases

(d) becomes 0 K

3. Which of the following is used as a working substance for a Carnot cycle?

(a) Ideal gas

(b) Real gas

(c) Steam

(d) Atmospheric air

4. The water tubes in a simple vertical boiler are(a) horizontal(b) vertical

(c) inclined(d) all of above5. Lancashire boiler is a(a) stationary fire tube boil`er(b) internally fired boiler

(c) horizontal boiler(d) all of the above

6. The diameter of internal flue tubes of a Lancashire boiler is about ______ that of its shell.(a) one-fourth(b) one-third

(c) two-fifth(d) one-half

7. Which of the following is a water tube boiler?(a) Lancashire boiler(b) Babcock & Wilcox boiler

(c) Locomotive boiler(d) Cochran boiler

8. In fire tube boilers

(a) water passes through the tubes which are surrounded by flames and hot gases.

(b) the flames and hot gases pass through the tubes which are surrounded by water

(c) forced circulation takes place

(d) none of the above

9. Which of the following boiler is best suited to meet the fluctuating demand of steam?(a) Locomotive boiler(b) Lancashire boiler

(c) Cornish boiler(d) Babcock & Wilcox boiler

10. Water tube boilers produce steam at a _________ pressure than that of fire tube boilers.(a) lower(b) higher

(c) mid(d) none of above

11. A device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called(a) safety valve(b) water level indicator(c) pressure gauge(d) fusible plug12. An air pre heater

(a) increases evaporative capacity of the boiler

(b) increases the efficiency of the boiler

(c) enables low grade fuel to be burnt

(d) all of the above13. The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

(a) feed check valve(b) feed pump

(c) pressure gauge(d) injector14. An economizer _________ the steam raising capacity of a boiler.

(a) increases(b) decreases

(c) has no effect on(d) none of above

15. Which of the following are boiler accessories?(a) safety valve(b) super heater(c) economizer(d) both (b) and (c)16. A device used to heat feed water by utilizing the heat in the exhaust flue gases before leaving through the chimney, is known as

(a) Super heater(b) economizer

(c) blow off cock(d) stop valve17. A device used to increase the temperature of saturated steam without raising its pressure, is called

(a) blow off cock(b) fusible plug

(c) super heater(d) economizer

18. A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called(a) blow off cock(b) fusible plug

(c) super heater(d) economizer19. In a boiler the basic purpose of a drum is(a) to separate steam from water(b) to remove salts from water(c) to serve as storage of steam(d) all of the above20. Where is the fusible plug in small boilers located?(a) above the steam dome

(b) at the inlet of chimney(c) over the combustion chamber

(d) in the drumME 106: Elements of Mechanical Engineering

Answer Sheet Unit: I1a18a35a52c

2b19b36b53b

3c20a37a54b

4d21b38 a55c

5b22c39d56d

6a23a40a57d

7b24b41a58c

8a25c42a59d

9b26a43c60a

10c27a44a61d

11c28b45a62c

12a29d46d63d

13a30a47a64a

14b31a48a65c

15c32b49d

16a33c50a

17d34d51c

Answer Sheet Unit: II

1a18d35a

2d19a36d

3c20a37a

4d21c38c

5a22d39d

6d23a40a

7a24b41b

8b25d42c

9c26c43a

10a27a44b

11b28b45d

12a29c46c

13c30a47a

14d31b48d

15a32c49b

16c33a50c

17a34d

Answer Sheet Unit: III1d17c3349

2a18b3450

3a19a3551

4c20a3652

5d213753

6c223854

7b233955

8b244056

9a254157

10b264258

11a274359

12d284460

13b294561

14a304662

15d314763

16b324864

new eme objectives

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