103) Most of the engines, generally, do not require balancing of secondary forces and couples.

104) The secondary unbalanced force is maximum __________ in one revolution of the crank.

105) A spring controlled governor is found unstable. It can be made stable by

106) In order to have a good grip on the pulley, the V-belt should touch the bottom of the groove in the pulley.

107) In order to double the period of a simple pendulum, the length of the string should be