61. If the total fuel energy is 100 units; then what will be the amount of fuel energy required to overcome friction-
62. The oil consumption may be high due to the reason-
63. What is the possible cause of water loss?
64. Coolant is used because
65. The temperature at which lubricating oil will give off sufficient vapours to form combustable mixture with air is known as
66. Which among the following is not the purpose of a grease?
67. What is the function of lubricating oil?
68. Which of the classifications indicates a multigrade oil?
69. For effective cutting of steel with hand hacksaw, which one of the following coolant is suitable?
70. Which of the following thermostat valves used in automobiles?
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