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13.

Which of the following is used to count the number of brass items passing on a conveyor line, when no contact is permitted with the object:

A.	event counter	B.	mechanical counter
C.	magnetic pick up	D.	photoelectric cell

14.

Which of the following does not pertain to timing device :

A.	charging of a condenser	B.	flow of oil through a dash pot
C.	release of air through a nozzle	D.	flow of sand through an opening

15.

Motion of fast-moving systems may be timed and studied by means of a :

A.	stroboscope	B.	piezoelectric crystal
C.	electronic timer	D.	chronometer

16.

In which device the input motion changes the inductive coupling between primary and secondary coils :

A.	potentiometer	B.	synchro
C.	collimator	D.	protractor

17.

Which effect is useful in measuring rapidly varying forces :

A.	piezoelectric	B.	strain gauge
C.	photovoltaic	D.	pneumatic gauging

18.

Pressure measuring devices are not based on:

A.	measure of an equivalent height of liquid column	B.	measure of the force exerted on a fixed area
C.	measure of some change in electrical or physical characteristics of the fluid	D.	area measurement by polar planimeter

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