Related Questions
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Percentage reduction in area performing tensile test on cast iron may be of the order of
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4
The value of one bar (in S. I. units) is equal to
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4
In an isothermal process,
A. There is no change in temperature
B. There is no change in enthalpy
C. There is no change in internal energy
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4
For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.
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4
Which of the following statement is wrong?
A. The closed cycle gas turbine plants are external combustion plants.
B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.
D. In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.
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4
The specific heat of water is
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A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum shear stress will be
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4
The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
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4
The efficiency of Joule cycle is
A. Greater than Carnot cycle
B. Less than Carnot cycle
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4
The columns whose slenderness ratio is less than 80, are known as
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4
The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by
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A shaft revolving at ω rad/s transmits torque (T) in Nm. The power developed is
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A key is subjected to side pressure as well at shearing forces. These pressures are called
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4
Shear modulus is the ratio of
A. Linear stress to linear strain
B. Linear stress to lateral strain
C. Volumetric strain to linear strain
D. Shear stress to shear strain
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4
Which of the following cycles is not a reversible cycle?
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In order to prevent crushing of masonry at the base of the dam, the maximum stress should be __________ the permissible stress of the soil.
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The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as
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In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called
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4
The mass of excess air supplied is equal to
A. (23/100) × Mass of excess carbon
B. (23/100) × Mass of excess oxygen
C. (100/23) × Mass of excess carbon
D. (100/23) × Mass of excess oxygen
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4
When a gas is heated at constant volume
A. Its temperature will increase
B. Its pressure will increase
C. Both temperature and pressure will increase
D. Neither temperature nor pressure will increase
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4
When a thin cylindrical shell is subjected to an internal pressure, the volumetric strain is (where ε₁ = Hoop strain, and ε₂ = Longitudinal strain)
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4
The buckling load for a given column depends upon
A. Area of cross-section of the column
B. Length and least radius of gyration of the column
C. Modulus of elasticity for the material of the column
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A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be
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4
When a gas is heated at constant pressure
A. Its temperature will increase
B. Its volume will increase
C. Both temperature and volume will increase
D. Neither temperature not volume will increase
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4
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
A. Combustion is at constant volume
B. Expansion and compression are isentropic
C. Maximum temperature is higher
D. Heat rejection is lower
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4
In the torsion equation T/J = τ/r = Gθ/ L, the term J/R is called
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The stress induced in a body due to suddenly applied load compared to when it is applied gradually is
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One kg of carbon produces __________ kg of carbon dioxide.
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The general law for the expansion or compression of gases, is
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The torsional rigidity of a shaft is expressed by the
A. Maximum torque it can transmit
B. Number of cycles it undergoes before failure
C. Elastic limit up to which it resists torsion, shear and bending stresses
D. Torque required to produce a twist of one radian per unit length of shaft