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A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be
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Elasticity of Mild Steel specimen is defined by
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A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with both ends hinged.
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The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
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The stress at which extension of the material takes place more quickly as compared to the increase in load is called
A. Elastic point of the material
B. Plastic point of the material
C. Breaking point of the material
D. Yielding point of the material
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4
When a system changes its state from one equilibrium state to another equilibrium state, then the path of successive states through which the system has passed, is known as
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Otto cycle is also known as
A. Constant pressure cycle
C. Constant temperature cycle
D. Constant temperature and pressure cycle
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The standard value of atmospheric pressure taken at sea level is
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The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is
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One kg of carbon produces __________ kg of carbon dioxide.
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The work ratio of simple gas turbine cycle depends upon
A. Maximum cycle temperature
B. Minimum cycle temperature
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The columns whose slenderness ratio is less than 80, are known as
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A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is
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Which of the following gas has a minimum molecular mass?
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The assumption made in Euler's column theory is that
A. The failure of column occurs due to buckling alone
B. The length of column is very large as compared to its cross-sectional dimensions
C. The column material obeys Hooke's law
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The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
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A cube subjected to three mutually perpendicular stress of equal intensity p expenses a volumetric strain
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Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Kinetic theory of gases
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The efficiency of Carnot cycle depends upon
C. Volume compression ratio
D. Cut-off ratio and compression ratio
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Which of the following is the extensive property of a thermodynamic system?
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Strain is equal to (where l = Original length, and δl = Change in length)
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The value of one bar (in S. I. units) is equal to
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Carnot cycle has maximum efficiency for
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A shaft revolving at ω rad/s transmits torque (T) in Nm. The power developed is
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The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
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One kilowatt is equal to
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The measurement of a thermodynamic property known as temperature is based on
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
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Which of the following gas is mostly used in town for street and domestic lighting and heating?
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A key is subjected to side pressure as well at shearing forces. These pressures are called
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A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the
B. Perpendicular to the axis of load
C. Maximum moment of inertia
D. Minimum moment of inertia