In spot welding, the spacing between two spot weld should not be less than _______________?

A. D
B. 1.5d
C. 3d
D. 6d

The shrinkage allowance for cast iron pattern is________________?

A. 15 mm/m
B. 20 mm/m
C. 26 mm/m
D. 10 mm/m

Tandem drawing of wires and tubes is necessary because_________________?

A. Accuracy in dimensions is not possible otherwise
B. Surface finish improves after every drawing stage
C. It is not possible to reduce at one stage
D. Annealing is needed between stages

The operation of straightening a curved sheet metal, is known as____________________?

A. Squeezing
B. Coining
C. Planishing
D. Drawing

For starting an axial flow pump, its delivery valve should be____________________?

A. Closed
B. Open
C. Depends on starting condition and flow desired
D. Could be either open or closed

Centrifugal pump is started with its delivery valve __________________?

A. Kept fully closed
B. Kept fully open
C. Irrespective of any position
D. Kept 50% open

When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be _________________?

A. Horizontal
B. Nearly horizontal
C. Steep
D. First rise and then fall

Multistage centrifugal pumps are used to obtain___________________?

A. High discharge
B. High head
C. Pumping of viscous fluids
D. High head and high discharge

In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?

A. Designing new impeller
B. Trimming the impeller size to the required size by machining
C. Not possible
D. Some other alterations in the impeller

Axial flow pump is started with its delivery valve________________?

A. Kept fully closed
B. Kept fully open
C. Irrespective of any position
D. Kept 50% open