B2-04 a and b revision

Which of the following is a surge protection device

• MOSFET

• Zener

• Varistor

What type of feedback will give a sustained/continuous output for the purpose of using an OPAMP as an oscillator?

• +

• -

• Neutral

the amount of error in a servomechanism that can exist around null without correction

• Null Condition

• Deadband

• Damping

In a BJT, collector current is affected by?

• Base Current

• Emitter Current

• BC Voltage

The purpose of R1 and Zener?

• controls the gain of the OPAMP

• provides a zero reference voltage

• gives a fixed reference voltage

• Control Transformer

• Torque Differential Transformer

• Resolver

N Chanel D-MOSFET gate has a positive voltage applied to the gate. What happens?

• Drain current increase

• Drain current decrease

• Drain voltage decrease

What is the function of a power supply filter?

• amplifies the voltage by a pre-set gain factor

• eliminates fluctuations and provides a constant DC level

• maximises ripple voltage

The purpose balancing resistors of parallel diodes?

• prevents damage to the diode with the lowest fwd bias voltage

• increases the reverse blocking capabilities of the diodes

• better temperature stabilisation

In RC coupling, what is the purpose of the input and output capacitors?

• allows for better impedance matching

• enables the transistor to reach saturation after 5 time constants

• unwanted dc removed so correct biasing levels can be maintained