Generic selectors
Exact matches only
Search in title
Search in content
Search in posts
Search in pages
Filter by Categories
nmims post
Objective Type Set
Online MCQ Assignment
Question Solution
Solved Question
Uncategorized

1. In ideal diode model diode in forward bias is considered as a
a) Resistor
b) Perfect conductor
c) Perfect insulator
d) capacitor

Answer: b [Reason:] In ideal diode model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero.

2. In ideal diode model diode in reverse bias is considered as a
a) Resistor
b) Perfect conductor
c) Perfect insulator
d) capacitor

Answer: c [Reason:] In ideal diode model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero.

3. Voltage drop produced by a diode at forward bias in ideal diode model is equal to
a) 0.7V
b) 0.3V
c) 1V
d) 0V

Answer: d [Reason:] In ideal diode model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero.

4. The current I through the circuit if we consider diode in ideal diode model a) 3mA
b) 3A
c) 1A
d) 0.4mA

Answer: a [Reason:] In ideal diode model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero. Since diode is forward biased current I = (3V/1K) = 3mA.

5. The voltage across the diode Vout if Vin is -5V and resistance is 10K is a) -5V
b) 0V
c) -2.5V
d) 2.5V

Answer: a [Reason:] In ideal diode model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero. Since diode is reverse bias no current flows through the circuit so entire voltage appears on diode.

6. The current I through the circuit I if voltage v is -3V is a) 0A
b) 3A
c) 1.5A
d) 6A

Answer: a [Reason:] In ideal diode model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero. Since diode is reverse bias no current will flow through the circuit.

7. If current source produces a current of 1mA and resistance R is 3K then voltage across the resistor is a) 0V
b) 1V
c) 3V
d) 1.5V

Answer: a [Reason:] In ideal diode model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero. Since current forward biases the diode it acts as a conductor so current through resistor is zero so voltage is zero. Therefore, voltage across resistor is zero.

8. If resistance R1 is 10K, V2 = 2V, V1 = 3V then the current I through the circuit will be a) 0.3mA
b) 0.6mA
c) 0.7mA
d) 0.1mA

Answer: d [Reason:] In ideal diode model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero. Since both voltage is reverse bias to diode the diode will disappear from the circuit. Then effective voltage becomes 3-2 = 1V so current is 1/10K = 0.1mA.

9. If resistance R1 is 10K, V2 = – 2V, V1 = 3V then the current I through the circuit will be a) 0.2mA
b) 0A
c) 0.5mA
d) 0.3mA 