ELEX Pre-Board Exam 2

What is a group of circuits that provides timing and signals to all operation in the computer?

• Output unit
• Memory unit
• Control unit
• Input unit

Where does voltage generated in a DC generator depend?

• Field resistance and flux
• Field and armature currents
• Flux and speed
• Speed and field resistance

__________ is the most influential factor in the switching speed of saturated bipolar transistor

• Charge stored
• Collector current
• HFE
• Base current

What is a pi-network?

• A Power Incidence Network
• A network consisting of one inductor and two capacitors or two inductors and one capacitor
• A network consisting entirely of four inductors or four capacitors
• An antenna matching network that is isolated form ground

__________ is the property of a material which opposes creation of magnetic flux?

• Resistance
• Permeance
• Reluctance
• Conductance

The purpose of cells connected in parallel is to

• increase internal resistance
• increase voltage output
• decrease current capacity
• increase current capacity

What does SI magnetic flux refer?

• Weber
• Flux
• Maxwell
• Lines

__________ is a type of linear regulator used in applications requiring efficient utilization of the primary power source.

• A series regulator
• A shunt regulator
• A constant current source
• A shunt current source

When a switch is closed, it has a total resistance of

• 1000 ohms at room temperature
• unstable
• infinity
• zero

How many turns are needed to produce a magnetizing force of 5000 A.t. for a coil of 50 amperes?

• 1,000 turns
• 5,000 turns
• 100 turns
• 500 turns