Physics-
General
Easy
Question
The graph given below represents the 
-
characteristics of a zener diode. Which part of the characteristics curve is most relevant for its operation as a voltage regulator?
The correct answer is:
When reverse bias is increased the electron field across the junction also increases. At some stage the electric field becomes so high that it breaks the covalent bonds creating electron-hole pairs. This mechanism is known as zener breakdown. In breakdown region for a long range of load (
) the voltage remains the same though the current may be large.
Related Questions to study
Physics-
In the following circuit, the current flowing through 1 k
resistor is
In the following circuit, the current flowing through 1 k resistor is
Physics-General
Chemistry-
. The equivalent conductances at infinite dilution of HCI and NaCl are 426.15 and 126.15 mho Cm2 g eq-I respectively. It can be said that the mobility of:
. The equivalent conductances at infinite dilution of HCI and NaCl are 426.15 and 126.15 mho Cm2 g eq-I respectively. It can be said that the mobility of:
Chemistry-General
Chemistry-
In the electrochemical reaction, 
increasing the concentration of Fe
In the electrochemical reaction, increasing the concentration of Fe
Chemistry-General
Chemistry-
K; Ca and Li metals may be arranged in the decreasing order of their standard electrode potentials as:
K; Ca and Li metals may be arranged in the decreasing order of their standard electrode potentials as:
Chemistry-General
Physics-
In the circuit, if the forward voltage drop for the diode is 0.5 V, the current will be
In the circuit, if the forward voltage drop for the diode is 0.5 V, the current will be
Physics-General
Physics-
The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milli-watt. What should be the value of the resistance
, connected in series with the diode, for obtaining maximum current?
The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milli-watt. What should be the value of the resistance, connected in series with the diode, for obtaining maximum current?
Physics-General
Chemistry-
In the reactions 
A and B are geometrical isomers of RC ≡ CR
In the reactions A and B are geometrical isomers of RC ≡ CR
Chemistry-General
Physics-
The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit?
The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit?
Physics-General
Physics-
A conductor and a semiconductor are connected in parallel as shown in the figure. At a certain voltage both ammeters register the same current. If the voltage of the DC source is increased then the
A conductor and a semiconductor are connected in parallel as shown in the figure. At a certain voltage both ammeters register the same current. If the voltage of the DC source is increased then the
Physics-General
Physics-
Figure shows a diode connected to an external resistance and an emf. Assuming that the barrier potential developed in diode is 0.5 V, obtain the value of current in the circuit in milli ampere.
Figure shows a diode connected to an external resistance and an emf. Assuming that the barrier potential developed in diode is 0.5 V, obtain the value of current in the circuit in milli ampere.
Physics-General
Chemistry-
Identify the alkyne in the following sequence of reactions:
Identify the alkyne in the following sequence of reactions:
Chemistry-General
Chemistry-
Trans-2-butene + Br2 gives:
Trans-2-butene + Br2 gives:
Chemistry-General
Chemistry-
(A) Addition of HBr to 1-butene gives two optical isomers.
(R) The product contains one asymmetric carbon.
(A) Addition of HBr to 1-butene gives two optical isomers.
(R) The product contains one asymmetric carbon.
Chemistry-General
Chemistry-
The synthesis of 3-octyne is achieved by adding a bromoalkene into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are :
The synthesis of 3-octyne is achieved by adding a bromoalkene into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are :
Chemistry-General
Chemistry-
Identify the product in the reaction
Identify the product in the reaction
Chemistry-General
