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# UPSC Recruitment Paper 2017 :  Assistant Engineer Grade-I (Mining, Mechanical & Drilling Engineering)

## (Mining, Mechanical & Drilling Engineering)

1. Throttling curve in a centrifugal pump running at constant speed represents the relationship between:
(a) Power and flow rate
(b) Efficiency and flow rate
(d) Efficiency and net suction positive head

2. Consider the following statements regarding the stability of bodies in a fluid medium:
1. The stability of a submerged body requires that the centre of gravity lies below the centre of buoyancy
2. To improve the stability of a floating body by increasing the bottom width and reducing the draft
3. For stability of a floating body, the metacentre should be above the centre of buoyancy but below the centre of gravity
Which of the above statements are correct?
(a) 1, 2 and 3
(b) 1 and 2 only
(c) 1 and 3 only
(d) 2 and 3 only

3. How does the angle of attack effect lift and drag?
(a) Increasing the angle of attack can decrease the lift, but it also increases drag so that less thrust required
(b) Increasing the angle of attack can increase the lift, but it also increases drag so that less thrust required
(c) Increasing the angle of attack can increase the lift, but it also increases drag so that more thrust required
(d) Increasing the angle of attack can decrease the lift, but it also increases drag so that more thrust required

4. A stone weighs 392.4 n in air and 196.2 n when fully submerged in water. The volume of the stone is:
(a) 1 × 104 cm3
(b) 2 × 104 cm3
(c) 3 × 104 cm3
(d) 4 × 104 cm3