# FET(Field Effect Transistors) Class 8 MCQ Electrical Engineering

30 Questions 20 Mins

This FET(Field Effect Transistors) Class 8 MCQ test contains random 30 Objective Questions. You have select one correct answer among given options.

## FET(Field Effect Transistors) Class 8 MCQ With Answers

### 1. Here is an experimental circuit. Plotting(the voltage between collector and emitter) against the base current is shown. The graph shows that as base current increases to ...

• the voltage across R3 increases
• is constant
• the transistor is saturated
• the voltage across R3 increases

### 2. When a FET is conducting current the gate voltage may be ...

• 0 V
• greater than the threshold voltage but less than the supply
• close to 0.7 V
• between 0V and the threshold

### 3. A thyristor is triggered by a ...

• negative pulse applied to the gate
• negative pulse applied to the anode
• positive pulse applied to the cathode
• positive pulse applied to the gate

### 4. Over its operating range, the collector current of a transistor is directly proportional to ...

• the change in base current
• the collector voltage
• the base current
• the emitter voltage

### 5. The current through a FET is ...

• constant
• much greater than the base current
• greater than that through a BJT
• proportional to the gate voltage

### 6. A thyristor is not turned off by ...

• short-circuiting anode to cathode
• a negative pulse to the gate
• turning off the power supply
• interrupting the current through it

•
•
•
•

### 8. The normal voltage difference between the base and the emitter is ...

• 0 V
• equal to the collector voltage
• variable

### 9. In a thyristor half-wave rectifier the lamp can be switched on at any time ...

• In the first half of the positive half-cycle
• after the peak of the positive half-cycle
• in the cycle
• in the second half of the positive half-cycle

### 10. A FET is used to convert ...

• a small current to a larger current
• a voltage to a current
• a small current to a voltage
• a small voltage to a larger voltage