140 TOP Machine Design Multiple choice Questions and Answers pdf

101.    The piston rod of a steam engine is usually connected to the cross head by means of
(a) bolted joint 
(b) knuckle joint
(c) cotter joint 
(d) universal joint
(e) universal coupling.
Ans: c

102.    Which of the following pipe joints would be suitable for pipes carrying steam
(a)     flanged
(b)     threaded
(c)    bell and spigot
(d)    expansion
(e)    compression.
Ans: d

103.    Spring index is
(a)    ratio of coil diameter to wire diameter
(b)    load required to produce unit deflection
(c)    its capability of storing energy
(d)    indication of quality of spring
(e)    nothing.
Ans: a

104.    The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is
(a)     larger
(b)     smaller
(c)    equal
(d)    larger/smaller depending on diameter of spring coil
(e)    unpredictable.
Ans: a

105.    Form coefficient of spring is
(a)    ratio of coil diameter to wire diameter
(b)    load required to produce unit deflection
(c)    its capability of storing energy
(d)    concerned With strength of wire of spring
(e)     nothing
Ans: c

106.    Spring stiffness is
(a)    ratio of coil diameter to wire diameter
(b)    load required to produce unit deflection
(c)    its capability of storing energy
(d)    its ability to absorb shocks
(e)    none of the above.
Ans: b

107.    When two springs are in series (having stiffness K), the equivalent stiffness will be
(a) K
(b) K/2
(c) 2K
(d) KIA
(e) UK.
Ans: b

108.    When a close coiled helical spring is compressed, its wire is subjected to
(a)    tension
(b)    shear
(c)    compression
(d)    all of the above
(e)    none of the above.
Ans: a

109.    If a spring is cut down into two springs, the stiffness of cut springs will be
(a)    half
(b)    same
(c)    double
(d)    unpredictable
(e)    none of the above.
Ans: c

110.    Belt slip may occur due to
(a)    heavy load
(b)    loose belt
(c)    driving pulley too small
(d)    all of the above
(e)    none of the above.
Ans: d

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