ISRO 2018 Machine Design Booster Quiz 2

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Question 1

The life of a ball bearing at a load of 10 KN is 8000 hours. Ifthe load is increased to 20 KN, keeping all other conditions the same, then its life in hours is

• A4000
• B2000
• C1000
• D500

Question 2

Two metal plates of thickness and ‘w’ are joined by a fillet wield of 45 °C as shown in fig. When subjected to a pulling force “F” the stress induced in the weld will be

• A
• B
• C
• D

Question 3

Which type of Gear meshing should be employed to transmit torque to a linear force?

• AEpicyclic Gear
• BHelical Gear
• CBevel Gear
• DRack and pinion

Question 4

Which one of the following key types is pressed against the shaft for power transmission by friction between the key and the shaft?

• AFeather key
• BSquare key
• CFlat key
• DSaddle key

Question 5

Two mating spur gears have 40 and 120 teeth respectively. The pinion rotates at 1200 rpm and transmits a torque of 20 N.m. The torque transmitted by the gear is

• A6.6 Nm
• B20 Nm
• C40 Nm
• D60 Nm

Question 6

A press machine exerts a force of 850 N on helical compression spring. A spring is required to be designed having a dia. of 8mm. It is assumed to have square and ground ends and no. of coils is 8. The gap between the consecutive coils is 1 mm. If the deflection was found to be 30mm calculate the pitch of coil.

• A13.22mm
• B8.15 mm
• C20.45 mm
• D10 mm

Question 7

Which of the following machine element is does not transmit power between the source and the machine absorbing the power.

• ACounter shaft
• BSpindle
• CFront axel
• DSprockets

Question 8

Materials used for brake lining should have____.

• Ahigh co-efficient of friction and this should increase with increase in temperature
• Bhigh co-efficient of friction and this should decrease with increase in temperature
• Chigh co-efficient of friction and this should be constant with change in temperature
• Dnone of these

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