negative
Well, the steam turbbine is most likely connected to an A/C generator which gives off the same frequency as the grid, so by running the turbine on a fixed frequency you don't have to condition the electricity before it can be released onto the grid.
The lock shield valves are installed usually in the fire hose reel and the valve can be opened only by the key. and the key shall be kept with the maintenace team not in the valve. So the valve cannot be closed by the other people.
he kept on trying
to keep moisture out
Not much.
A grid in a high-vacuum triode is usually kept negatively charged with respect to the cathode so that the electrons may be passed through to the anode, but controlled by changes in grid voltage. The triode accomplishes this by amplifying signals applied.
the grid is negative so it can control the amount of electrons coming off the cathode. To stop or decrease intensity of cathode ray/electron beam, it is made more negative (to repel electrons as negative charge and negative charge repel) and to increase intensity, the grid is made less negative.
If this is for your Penn-foster test i can tell you one thing is that the the answer isn't "accelerated toward the anode".
They are usually kept in a stable with access to a field.
Usually in a hive.
kept (as in "She has been kept away from the children.", "Usually, wine is kept in barrels.")
The kettle is usually kept in the kitchen because that is where it is usually used. A standard kettle must be used on a stove which is also in the kitchen. An electric kettle may be used anywhere, but is usually kept in the vicinity of the cups and tea or coffee.
A broken arm is usually kept in a cast. sling
Usually in offices.
museum
Planes are usually kept in hangars, which are like huge barns with sliding doors.
They are kept in a fish shop or aquarium or even a fish tank