The _____ ride against the commutator segments and are used to connect the armature to the external circuit of the DC machine.

A) field windings
B) pole pieces
C) armature windings
D) brushes

In a parallel circuit, the current flow through the inductor will be _____.

A) in phase
B) 180 ° out of phase
C) 90 ° out of phase with the voltage
D) less than 90 ° out of phase with the resistor current lagging

PI-type filters are so named because they _____.

A) add 3.14 V to the input
B) multiply the input by 3.14
C) divide the input by 3.14
D) resemble the Greek letter π

_____ is based on the volume of the cylinder with the piston at the bottom dead center compared to top dead center.

A) Displacement
B) Compression ratio
C) Volumetric efficiency
D) Mechanical efficiency

A complete circuit is often referred to as a(n) _____ circuit.

A) closed
B) open
C) shorted
D) grounded