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Theory of machine| part -1

Kinematics links - Every part of machine which have relative motion to another part.   → The link should be resistance body.   What is resistant body? →Under the action of force it can transfer motion and power. Kinematics links →1. Rigid links     2. Flexible links     3. Fluid links Rigid links - There is no deformation.   Ex - piston,connecting rod Flexible links - Deformation is allowed under permissible limits. Ex - Belt drive Fluid links - A fluid link is one that is deformed by having fluid in a closed vessel and the motion is transmitted through the fluid by pressure. Ex - Hydraulic press   Types of links - 1. Singular 2. Binary 3. Ternary 4. Quaternary links
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Good quality MCQ question for competitive exam

                THERMODYNAMIC

MCQ question,cheptra thermodynamic
1.A reversible polytropic process can be described by the equation-
A. PV^n=C                           B.(PV)^n=C
C.(P/V)^n=C                        D. PV^-n=C

Ans : PV^n=C

2.Which of the following quantities do not represent the property of the system?
A. ∫ pdv                                 B. ∫ vdp
C. Cyclic ∫ pdv                     D.none of this above

Ans : none of this above

3.Workdone of adiabetic process between a given pair of end states depends on-
A.the end state only
B.particular adiabetic process
C.mass of the system
D.the value of index n

Ans : the end state only.

4.Which of the following quantities is not the property of the system?
A.heat                                 B.density
C.specific volume            D.temperature

Ans : heat

5.Specific heat of air at constant volume Cv  is equal to-
A. 0.17                            B. 0.21
C. 0.24                            D. 1.0

Ans : 0.17

6.Which is true for reversible polytropic process??
A.temperature remains constant
B.some heat transfer takes place
C.enthalpy remain constant
D.entropy remains constant

Ans : some heat transfer takes place

 7.For reversible adiabetic process,change in entropy is-
A.maximum                     B.minimum
C.unpredictable              D.zero

 Ans : unpredictable

 8.The more effective way of increasing efficiency of carnot engine is to-
A.increase higher temperature
B.decrease higer temperature
C.increase lower temperature
D.decrease lower temperature

 Ans : decrease lower temperature

9.The law pv^γ is not applicable for-
A.adiabetic expansion of steam in turbine
B.adiabetic expansion of steam reciprocating steam engine
C.free expansion of an ideal gas
D.ideal compression of air

 Ans : free expansion of an ideal gas

 10.Minimum work of a compressor is possible when the value of adiabetic index is equal-
A. 0.75                              B. 1
C.1.27                               D. 2

 Ans : 0.75

 11.Molecular volume of any perfect gas at 600༝10^3 N/m^2 and 27°C will be-
A. 4.17 m^3/kg mol
B. 400 m^3/kg mol
C. 0.15 m^3/kg mol
D. 41.7 m^3/kg mol

 Ans : 4.17 m^3/kg mol

 12.A perfect gas at 27°C is heated at constant pressure till its volume is double.The final temperature is-
A. 54°C                             B. 327°C
C. 600°C                           D. 100°C

 Ans : 327°C

 13.If a certain amount of dry ice mixed with same amount of water at 80°C,the final tetemperature of mixed will be-
A. 80°C                             B. 0°C
C. 40°C                             D. 20°C

 Ans : 20°C

 14.Workdone is zero for the following process-
A. constant volume            
B. free expansion
C. Throttling
D. All of the above

 Ans : all of the above

 15.The first law of thermodynamics was ddeveloped by-
A.joule                              B.carnot
C.charles                         D.kelvin

 Ans : joule

 16.Total heat of a substance is also known as-
A.enthalpy                      B.entropy
C.internal energy           D.thermal energy

 Ans : enthalpy

 17.The work required for compression in a closed  system increases when the value of n-
A.increases                      B.decrease
C.remain same             D.first increase  and then decrease

 Ans : increases

 18.carnot cycle efficiency depends upon-
A.properties of the medium/substance used
B.temperature range of operation
C.working conditions
D.condition of energy

 Ans : temperature range of operation

 19.Measurement of temperature  is based on-
A.thermodynamic properties
B.zeroth law of thermodynamic
C.first law of thermodynamic
D.joule's law

 Ans : zeroth law of thermodynamic

 20.The value of joule-kelvin coefficient for an ideal gas is-
A. 1                          B. Some —ve value
C.zero                     D. Some +ve value

 Ans : zero

 21.If is previous problem,the heat rejected is 315 kcal/mt then process will be-
A.reversible                         B.irreversible
C.impossible
D.unstable

 Ans : impossible

22.The value of ΣdQ/T for an irreversible process is-
A.equal to zero
B.greater than zero
C.less than zero
D.unity

 Ans : less than zero

23.The value of ΣdQ/T for a reversible process is -
A. + value
B. — value
C. Zero
D.unity

 Ans : zero

 24.In a cycle,heat rejected at -
A.constant temperature
B.constant pressure
C.constant volume
D.any of the above

 25.A diathermic wall is one which-
A.prevent thermal interaction
B.permit tharmal interaction
C.encourages tharmal interaction
D.doesn't exist

 Ans : permit tharmal interaction
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