Question: Which of the following is mostly used used as blast furnace fuel for extracting pig iron from iron ores?

• 1. Brown coal
• 2. Anthracite coal
• 3. Hard coke
• 4. Woodchar coal

Question: The patrol is distilled at a temperature from :

• 1. 6° to 20°
• 2. 220° to 345°
• 3. 65° to 220°
• 4. 15° to 120°

Question: The rated life of a bearing varies___________________?

• 1. directly as load
• 2. inversely as square of load
• 3. inversely as cube of load
• 4. inversely as fourth power of load

Question: In hydrostatic bearings ____________________?

• 1. the Oil film pressure is generated only by the rotation of the journal
• 2. the oil film is maintained by supplying oil under pressure
• 3. do not require external supply of lubricant
• 4. grease is used for lubrication

Question: If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?

• 1. ZN/p
• 2. p/ZN
• 3. Z/pN
• 4. N/Zp

Question: In hydrodynamic bearings_____________________?

• 1. the oil film pressure is generated only by the rotation of the journal
• 2. the oil film is maintained by supplying oil under pressure
• 3. do not require external supply of lubricant
• 4. grease is used for lubrication

Question: Aircraft body is usually fabricated by_________________?

• 1. welding
• 2. precasting
• 3. rivetting
• 4. casting

Question: If a spring is cut down into two springs, the stiffness of cut springs will be _________________?

• 1. half
• 2. same
• 3. double
• 4. unpredictable

Question: When two springs are in series (having stiffness K), the equivalent stiffness will be________________?

• 1. K
• 2. K/2
• 3. 2K
• 4. KIA

Question: Form coefficient of spring is _____________________?

• 1. ratio of coil diameter to wire diameter
• 2. load required to produce unit deflection
• 3. its capability of storing energy
• 4. concerned With strength of wire of spring