1. In a spring-mass system, the mass is 0.1 kg and the stiffness of the spring is 1 kN/m. By introducing a damper, the frequency of oscillation is found to be 90% of the original value. What is the damping coefficient of the damper?
A. 1.2 N.s/m
B. 3.4 N.s/m
C. 8.7 N.s/m
D. 12.0 N.s/m
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2. In a machining operation, doubling the cutting speed reduces the tool life to 1/8 of the original value. The exponent n in Taylor
A. 1/8
B. 1/4
C. 1/3
D. 1/2
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3. In PERT analysis a critical activity has
A. maximum Float
B. zero Float
C. maximum Cost
D. minimum Cost
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4. Environment friendly refrigerant R134a is used in the new generation domestic refrigerators. Its chemical formula is
A. CH Cl F2
B. C2 Cl3 F3
C. C2 Cl2 F4
D. C2 H2 F4
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5. From a pack of regular playing cards, two cards are drawn at random. What is the probability that both cards will be Kings, if the first card is NOT replaced?
A. 1/26
B. 1/52
C. 1/169
D. 1/221
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6. During the execution of a CNC part program blockNO20 GO2 X45.0 Y25.0 R5.0the type of tool motion will be
A. circular Interpolation — clockwise
B. circular Interpolation — counterclockwise
C. linear Interpolation
D. rapid feed
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7. A weighing machine consists of a 2 kg pan resting on spring. In this condition, with the pan resting on the spring, the length of the spring is 200 mm. When a mass of 20 kg is placed on the pan, the length of the spring becomes 100 mm. For the spring, the un-deformed length 10 and the spring constant k (stiffness) are
A. l0 = 220 mm, k = 1862 N/m
B. l0 = 210 mm, k = 1960 N/m
C. l0 = 200 mm, k = 1960 N/m
D. l0 = 200 mm, k = 2156 N/m
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8. A welding operation is time-studied during which an operator was pace-rated as 120%. The operator took, on an average, 8 minutes for producing the weld-joint. If a total of 10% allowances are allowed for this operation, the expected standard production rate of the weld-joint (in units per 8 hour day) is
A. 45
B. 50
C. 55
D. 60
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9. When 3-2-1 principle is used to support and locate a three dimensional work-piece during machining, the number of degress of freedom that are restricted is
A. 7
B. 8
C. 9
D. 10
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10. For a fluid flow through a divergent pipe of length L having inlet and outlet radii of R1 and R2 respectively and a constant flow rate of Q, assuming the velocity to be axial and uniform at any cross-section, the acceleration at the exit is
A. 2Q(R1 - R2)/(22/7)LR2^3
B. 2Q^2 (R1 - R2)/(22/7)LR2^3
C. 2Q^2 (R1 - R2)/(22/7)^2LR2^5
D. 2Q^2 (R2 - R1)/(22/7)^2LR2^5
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11. Starting from x0 = 1, one step of Newton-Raphson method in solving the equation x^3 + 3x -7 = 0 gives the next value (x1) as
A. x1 = 0.5
B. x1= 1.406
C. x1= 1.5
D. x1 = 2
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12. A mould has a downsprue whose length is 20 cm and the cross sectional area at the base of the downsprue is 1 cm^2. The downsprue feeds a horizontal runner leading into the mould cavity of volume 1000 cm^3 . The time required to fill the mould cavity will be
A. 4.05 s
B. 5.05 s
C. 6.05 s
D. 7.25 s
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13. The Gauss divergence theorem relates certain
A. surface integrals to volume integrals
B. surface integral to line integrals
C. vector quantities to other vector quantities
D. line integrals to volume integrals
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14. The ratio of shear modulus to the modulus of elasticity for a Poisson’s ratio of 0.4 will be:
A. 5/9
B. 11/17
C. 7/5
D. 5/14
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15. The Corriolis component of acceleration acts:
A. along the sliding surface
B. perpendicular to the sliding surface
C. parallel to the sliding surface
D. None
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16. Which of the following mechanism is made up of turning pairs
A. Scott Russell’s mechanism
B. Peaucellier’s mechanism
C. Both
D. None
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17. Which of the following is not true for a product layout
A. flexibility
B. high volume
C. standardized product
D. all
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18. If all the dimensions of a prismatic bar of square cross section are doubled, then the total elongation due to self wait will be:
A. double
B. four times
C. eight times
D. sixteen times
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19. A centrifugal pump has following specification: Speed - 1000 rpm, Flow - 1200 lpm, Head - 20m, Power - 5HP. If speed is increased to 1500 rpm, new flow will be:
A. 1800 lpm
B. 2700 lpm
C. 1200 lpm
D. 4500 lpm
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20. Enthalpy is:
i. point function
ii. path function
iii. intensive property
iv. extensive property
A. i and ii
B. i and iv
C. ii and iii
D. iii and iv
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Answers
1. C
2. C
3. B
4. D
5. D
6. A
7. B
8. A
9. C
10. C
11. C
12. B
13. A
14. D
15. B
16. B
17. A
18. B
19. A
20. B
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