mockboard pt.5

In an n-p-n transistor, the majority carriers in the base are

• electrons
• holes
• both holes and electrons
• either holes or electrons

For a transistor to function as an amplifier,

• both the EB and CB junctions must be forward-biased.
• both the EB and CB junctions must be reverse-biased.
• the EB junction must be forward-biased and the CB junction must be-biased.
• the CB junction must be forward-biased and the EB junction must be reverse-biased.

Voltage-divider bias provides:

• an unstable Q point
• a stable Q point
• a Q point that easily varies with changes in the transistor's current gain
• a Q point that is stable and easily varies with changes in the transistor’s current gain

A bipolar junction transistor operates with a collector current of 1.2 A and a base current of 50mA. What will the value of emitter current be?

• 1.25 A
• 0.05 A
• 1.2 A
• 1.15 A

On the schematic symbol of a pnp transistor,

• the arrow points out on the emitter lead.
• the arrow points out on the collector lead.
• the arrow points in on the base lead.
• the arrow points in on the emitter lead.

In a transistor, which current is the largest?

• IC.
• IE.
• IB.
• ID.

Determine RB and RC for a fixed-bias configuration if VCC = 12 V, β= 80, and ICQ = 2.5 mA with VCEQ =6 V. Use standard values.

• 361.6 kΩ ; 2.4 kΩ
• 361.6 kΩ ; 4.2 kΩ
• 316.6 kΩ ; 2.4 kΩ
• 316.6 kΩ ; 4.2 kΩ

To operate properly, a transistor's base-emitter junction must be forward biased with reverse bias applied to which junction?

• collector-emitter
• base-collector
• base-emitter
• collector-base

For a certain BJT, the following values are given, β = 60, Iceo=1μA and Ic =1.5 mA. Compute for the value of IE.

• 1.67 mA
• 1.23 mA
• 1.89 mA
• 1.52 mA

The primary function of the bias circuit is to

• hold the circuit stable at VCC
• hold the circuit stable at Vin
• ensure proper gain is achieved
• hold the circuit stable at the designed Q-point