Design Of Machine Elements Start Creating PDF

MCQ: Which of the following formula is used to calculate oil-film thickness in hydrodynamic bearings?

1. h = (c + Є cos θ)
2. h =(c – Є cos θ)
3. h = c (1+ Є sin θ)
4. h = c (1+ Є cos θ)

MCQ: What does number 6 indicate in the class of wire rope 6 x 37 (18/12/6/1)?

1. Diameter
2. Strands
3. Wires
4. None of the above

MCQ: Lang lay ropes offer more resistance to __________

1. fatigue failure
2. abrasive failure
3. both a. and b.
4. none of the above

MCQ: A V-belt pulley has belt velocity 20 m/s and mass 0.7 kg per meter. If allowable tension in the belt is 600 N then what will be the power transmitting capacity of belt? (Assume μ = 0.5 & θ = 2.5 rad)

1. 3.75 kW
2. 3.2 kW
3. 4.5 kW
4. 5.23 kW

MCQ: A V-belt pulley transmits power to flat belt pulley. If the coefficient of friction is 0.25 then which pulley governs the design? (β = 21° & α = 0.2)

1. Flat pulley
2. V-belt pulley
3. Both a. and b.
4. None of the above

MCQ: Which of the following statements is/are true for V-belts?

1. V-belt drives have low reduction ratio
2. Due to wedging action slip is negligible in V-belts
3. V-belt transmits power over long centre distances
4. All of the above

MCQ: If pressure angle is 22° and coefficient of friction is 0.05. What is the axial force acting on the worm gear designated as 1/40/10/5, if tangential force of 1200 N acts on it?

1. 1241.2 N
2. 2618.4 N
3. 7755.1 N
4. 7847.4 N

MCQ: What is the shortest distance between worm gear and axes of the worm for a worm gear pair designated as 2/40/10/8?

1. 50 mm
2. 200 mm
3. 320 mm
4. 360 mm

MCQ: A worm gear pair has 2 starts on worm thread, 11.2 as diametral quotient, 2 as module and 38 number of teeth on worm gear. How is the gear pair designated with these specifications?

1. 2/11.2/38/2*
2. 11.2/2/38/2
3. 2/38/2/11.2
4. 2/38/11.2/2

MCQ: A cylindrical roller bearing is subjected to radial force of 4500 N and application factor 1.3. What is the equivalent dynamic load acting on bearing if it has 90% reliability with desired life of 10000 hrs?

1. 3461.53 N
2. 5000 N
3. 5850 N
4. Insufficient data