Q.1
The smallest diameter of an external or internal screw thread is known as
Q.2
When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)
Q.3
The algebraic difference between the maximum limit and the basic size is called
Q.4
Which of the following spring is used in mechanical wrist watch?
Q.5
The bearings of heavy series have capacity __________ over the medium series.
Q.6
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle
Q.7
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.
Q.8
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio
Q.9
The piston rod of a steam engine is usually connected to the cross-head by means of
Q.10
The maximum shear stress theory is used for
Q.11
The maximum normal stress theory is used for
Q.12
Rankine's theory is used for
Q.13
Guest's theory is used for
Q.14
In a turnbuckle, if one of the rods has left hand threads, then the other rod will have
Q.15
A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as
Q.16
The creep in the belt is due to
Q.17
Which of the following is not correct procedure to increase the fatigue limit?
Q.18
In radial cams, the follower moves
Q.19
In cylindrical cams, the follower moves
Q.20
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to
Q.21
The taper on a rectangular sunk key is
Q.22
The standard length of the shaft is
Q.23
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as
Q.24
A tapered key which fits in a key-way in the hub and is flat on the shaft, is known as
Q.25
For steel, the ultimate strength in shear as compared to ultimate strength in tension is
Q.26
Failure of a material is called fatigue when it fails
Q.27
The centrifugal tension in the belt
Q.28
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be
Q.29
In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)
Q.30
Slenderness ratio is the ratio of
Q.31
The contact ratio is the ratio of
Q.32
The efficiency of a square threaded screw is maximum if the helix angle is equal to
(Where φ = Angle of friction)
Q.33
Brittle coating technique is used for
Q.34
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?
Q.35
The process which improves the machinability of steels, but lowers the hardness and tensile strength is
Q.36
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is
Q.37
In unilateral system of tolerance, the tolerance is allowed on
Q.38
A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material.
Q.39
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as
Q.40
A column is known as a long column if the slenderness ratio is
Q.41
Euler’s formula for a mild steel column is not valid if the slenderness ratio is
Q.42
The taper on key is given on
Q.43
A type of brake commonly used in motor cars is a
Q.44
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be
Q.45
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.
Q.46
The pitch diameter is the __________ diameter of an external or internal screw thread.
Q.47
The material commonly used for machine tool bodies is
Q.48
When the belt is transmitting maximum power,
Q.49
When a belt drive is transmitting maximum power,
Q.50
When a helical compression spring is cut into halves, the stiffness of the resulting spring will be
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