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- Question 1 of 15
An ideal gas of mass m is contained in a rigid tank of volume V at a pressure p. During a reversible process its pressure reduces to p1. Following statements are made regarding the process.
(P) Heat is transferred from the gas.
(Q) Work done by the gas is zero.
(R) Entropy of the gas remains constant.
(S) Entropy of the gas decreases.
Among the above statements, the correct ones areCorrectIncorrect
- Question 2 of 15
In a fully developed turbulent flow through a circular pipe, a head loss of h1 is observed. The diameter of the pipe is increased by 10% for the same flow rate and a head loss of h2 is noted. Assume friction factor for both the cases of pipe flow is the same. The ratio of h2/h1 is closest toCorrectIncorrect
- Question 3 of 15
Two cast iron blocks P and Q, each of 500 mm length, have the same cross-sectional area. Block P has rectangular cross-section of 100 mm × 200 mm. Block Q is of square cross-section. Both P and Q were cast under the same conditions with all their surfaces enclosed within the mould. The solidification time of a casting is proportional to the square of the ratio of its volume to its surface area. The ratio of solidification time of the block P to that of the block Q is ______.CorrectIncorrect
- Question 4 of 15
A 300 mm long copper wire of uniform cross-section is pulled in tension so that a maximum tensile stress of 270 MPa is developed within the wire. The entire deformation of the wire remains linearly elastic. The elastic modulus of copper is 100 GPa. The resultant elongation (in mm) is ________.CorrectIncorrect
- Question 5 of 15
In a single-pass rolling operation, a 200 mm wide metallic strip is rolled from a thickness 10 mm to a thickness 6 mm. The roll radius is 100 mm and it rotates at 200 rpm. The roll-strip contact length is a function of roll radius and, initial and final thickness of the strip. If the average flow stress in plane strain of the strip material in the roll gap is 500 MPa, the roll separating force (in kN) isCorrectIncorrect
- Question 6 of 15
Two solid cylinders of equal diameter have different heights. They are compressed plastically by a pair of rigid dies to create the same percentage reduction in their respective heights. Consider that the die-workpiece interface friction is negligible. The ratio of the final diameter of the shorter
cylinder to that of the longer cylinder is __________.CorrectIncorrect
- Question 7 of 15
In abrasive water jet machining, the velocity of water at the exit of the orifice, before mixing with abrasives, is 800 m/s. The mass flow rate of water is 3.4 kg/min. The abrasives are added to the water jet at a rate of 0.6 kg/min with negligible velocity. Assume that at the end of the focusing tube, abrasive particles and water come out with equal velocity. Consider that there is no air in the abrasive water jet. Assuming conservation of momentum, the velocity (in m/s) of the abrasive water jet at the end of the focusing tube isCorrectIncorrect
- Question 8 of 15
A single axis CNC table is driven by a DC servo motor that is directly coupled to a lead screw of 5 mm pitch. The circular encoder attached to the lead screw generates 1000 voltage pulses per revolution of the lead screw. The table moves at a constant speed of 6 m/min. The corresponding frequency (in kHz) of the voltage pulses generated by the circular encoder is_________.CorrectIncorrect
- Question 9 of 15
A helical gear with involute tooth profile has been machined with a disc-type form gear milling cutter. The helical gear has 30 teeth and a helix angle of 30 degree. The module of the gear milling cutter is 2. The pitch circle diameter (in mm) of the helical gear is_______________.CorrectIncorrect
- Question 10 of 15
Consider a system with 10 identical components connected in series. The time to failure of each component is exponentially distributed with a failure rate of 0.10 per 500 days. The reliability of the system after 400 days of operation isCorrectIncorrect
- Question 11 of 15
In a given year, a restaurant earned INR 38,500 in revenues. In that year, total expenses incurred were INR 30,000 and the depreciation amount was INR 3,200. At 40% tax rate, the net cash flow (in INR) for that year wasCorrectIncorrect
- Question 12 of 15
In numerical integration using Simpsons rule the approximating function in the interval is aCorrectIncorrect
- Question 13 of 15
If the principal stress values are 120 Mpa, -50 Mpa and 10 Mpa in a given state of stress then maximum shear stress in the material in Mpa isCorrectIncorrect
- Question 14 of 15
In a rolling of a flat strip the relative velocity of strip with respect to the roller isCorrectIncorrect
- Question 15 of 15
Built up edge formation decreases under the conditions listed below exceptCorrectIncorrect