Top 250+ Solved Theory of Machines MCQ Questions Answer
Q. The 'crowning' of flat pulleys is generally done pulley
a. To reduce belt friction
b. To prevent belt joining from damaging the belt surface
c. To prevent the belt from running off the pulley
d. In case of cross belt drives only
e. None of the above
Q. V belt having cross-section A is suitable for usual load of 5 HP. If 15 HP load is to be transmitted
a. Toothed belts may be used
b. 3 Vee belts using 3 groove pulley may be used
c. Machine arrangement may be modified
d. Drive system may be changed
e. Gear system may be adopted
Q. The efficiency in case of worm gear drives is generally in the range
a. 70-85 percent
b. 50-70 percent
c. 10-25 percent
d. 25-40 percent
e. 40 - 60 percent
Q. Two shafts have their axes not in the same straight line. Also their axes are not parallel but intersecting. Which of the following coupling can be used for these shafts?
a. Flexible coupling
b. Universal coupling
c. Oldham's coupling
d. Rigid coupling
e. Any of the above
Q. Coriolis component is not involved in
a. Andreau variable stroke engine mechanism
b. Slider crank mechanism
c. Line sliding in a swivelling pin
d. Quick return mechanism
e. Tangent cam acceleration
Q. Idler pulley is used for
a. Maintaining belt tension
b. Changing direction of rotation
c. For stopping motion frequently
d. For running during idling periods only
e. None of the above
Q. Contact ratio of gear should be
a. One
b. More than one
c. Less than one
d. Not defined
e. None of the above
Q. The number of nodes in a shaft carrying three rotors will be
a. Three
b. Zero
c. Four
d. Two
e. One
Q. By using large thread angles in a lifting machine
a. The mechanical advantage will be low
b. The mechanical advantage will be high
c. The load will be sustained in absence of effort
d. The load will be easily lifted
e. While unloading, little effort will be required
Q. The throw of a cam is the maximum distance of the follower from
a. Starting to finish
b. Inner most circle
c. Root circle
d. Pitch circle
e. Base circle
Q. The number of degrees of feeedom for a vibrating beam will be
a. Nil
b. Four
c. Two
d. Five
e. One
Q. Which of the following is a lower pair?
a. Piston and cylinder
b. Cam and follower
c. Belt drive
d. Gear
e. None of the above
Q. Which of the following is a dead weight governor?
a. Porter governer
b. Hartness governer
c. Watt governor
d. None of the above
e. None of the above
Q. The mechanism used in a petrol engine is
a. Crank mechanism
b. Slider mechanism
c. Slider crank mechanism
d. Natural line and circular mechanism
e. None of the above
Q. In the Crossby engine indicator which one of the following mechanism is used?
a. Slider-crank mechanism
b. Scotch yoke mechanism
c. Scotch yoke mechanism
d. Modified pantograph mechanism
e. None of the above