For a square key made of mild steel, the shear and crushing strength are related as
A. Shear strength is equal to crushing strength
B. Shear strength is greater than crushing strength
C. Shear strength is less than crushing strength
D. None of the above
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The dynamic tooth load is due to
A. Inaccuracies of tooth spacing
B. Irregularities in tooth profiles
C. Deflections of teeth under load
D. All of these
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When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be
A. 0.8 d
B. 1.2 d
C. 1.57 d
D. 1.8 d
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The permissible stress in the fillet weld is 100 N/mm². The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is
A. 7.5 kN
B. 10.6 kN
C. 15 kN
D. 22.5 kN
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In a partial journal bearing, the angle of contact of the bearing with the journal is
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In a full journal bearing, the angle of contact of the bearing with the journal is
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If a bearing is designated by the number 305, it means that the bearing is of
A. Medium series whose bore is 5 mm
B. Medium series whose bore is 25 mm
C. Light series whose bore is 25 mm
D. Light series whose bore is 5 mm
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In a flat belt drive, if the slip between the driver and belt is 1%, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be
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The static tooth load should be __________ the dynamic load.
A. Equal to
B. Less than
C. Greater than
D. None of these
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The wear load should be __________ the dynamic load.
A. Equal to
B. Less than
C. Greater than
D. None of these
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In designing a key, it is assumed that the distribution of forces along the length of key
A. Varies linearly
B. Is uniform throughout
C. Varies exponentially, being more at the torque-input end
D. Varies exponentially, being less at the torque-input end
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The bearings of medium series have capacity __________ over the light series.
A. 10 to 20%
B. 20 to 30%
C. 30 to 40%
D. 40 to 50%
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If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will
A. Have same value as that of standard specimen
B. Increase
C. Decrease
D. None of these
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The effective stress in wire ropes during normal working is equal to the stress due to
A. Axial load plus stress due to bending
B. Acceleration/retardation of masses plus stress due to bending
C. Axial load plus stress due to acceleration/retardation
D. Bending plus stress due to acceleration/retardation
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When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as
A. Crown bevel gears
B. Angular bevel gears
C. Mitre gears
D. Internal bevel gears
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When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as
A. Angular bevel gears
B. Crown bevel gears
C. Internal bevel gears
D. Miter gears
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The crest diameter of a screw thread is same as
A. Major diameter
B. Minor diameter
C. Pitch diameter
D. Core diameter
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The maximum efficiency of a square threaded screw is
A. 1 + sin φ 1 − sin φ
B. 1 − sin φ 1 + sin φ
C. 1 + cos φ 1 − sin φ
D. 1 − sin φ 1 + cos φ
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In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.
A. Equal to
B. Twice
C. Three times
D. Four times
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The connecting rod bolts are tightened up so that tightening stress
A. Is just sufficient to hold parts together
B. Approaches yield point
C. Is 50% of yield point
D. Is about yield point divided by safety factor
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