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Negative voltage regulation can only occur with leading power factor loads; however, not all leading loads will cause negative voltage regulation. Negative voltage regulation means the voltage increases with the load. This is a very undesirable condition because it can lead to an unstable condition.

Instrument transformers are used in
The instrument transformer can reduce AC voltage or high current levels to where AC voltage or high current can be directly measured by the instrument. It can also provide power for relay protection and automatic device. Instrument transformer is composed of current transformer (CT) and potential transformer (PT).

If the field current is more than the normal field current, motor is said to be over excited. This excess field current produces excess flux (flux set up by DC supply rotor winding ? resultant air gap flux) which must be neutralized by the armature winding.

Hence the armature winding draws lagging power factor which delivers reactive power.
An under excited synchronous generator runs at leading reactive power .

Francis turbine is the bulk flow is in the radial direction.
To be more clear, the flow is tangential and radial at the inlet but is entirely radial with a negligible tangential component at the outlet.
The flow, under the situation, has to make a 90 degree turn after passing through the rotor for its inlet to the draft tube.
Thus the absolute velocity is radial at the outlet.

Negative skin friction is the process where skin friction acts downward due to soil.
When skin friction is acting downwards it would decrease the pile capacity.
Negative skin friction (also known as downdrag), could be a major problem in some sites.
Negative skin friction is usually a downward shear drag acting on a pile or pile group due to downward sinking of surrounding soil relative to the piles.
It occurs when a load higher the design load comes to action.

Open loop system is system with no feedback while closed loop system is one with feedback.
Errors are more in open loop system and hence less accurate while in closed system errors are less because of feedback and so its more accurate.

Coliform test is used to determine the presence of coliform bacteria in the sample, which derives its origin from human excreta.
The most basic test for bacterial contamination of a water supply is the test for total coliform bacteria.
Total coliform counts give a general indication of the sanitary condition of a water supply.
Widal test is one method that may be used to help make a presumptive diagnosis of enteric fever, also known as typhoid fever.

The given condition can be drawn in the figure like below:

Hence, A is in a south-westerly direction with respect to C.

Given that the semi circular shaped pier is aligned parallel to the flow.
The shape factor is the ratio of safe scour depth to width ratio.
Shape factor for the given condition is 2.

A gable roof is a roof consisting of two sections whose upper horizontal edges meet to form its ridge.
A gable roof can have one, two or more gables.
The leeward side of the gable roof will experience a suction.
Due to that suction, the pressurecoefficients will always be negative.

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