Question

In the cutoff region the collector-base junction is an important bias and therefore the base emitter junction is an important bias for a transistor.
A. Reverse, forward
B. Forward, reverse
C. Reverse, reverse
D. Forward, forward

Answer 1

Hint: A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material usually with a minimum of three terminals for connection to an external circuit. The transistor can be used as a switch by operating it in cutoff and the saturation region.

 Complete step by step answer:
Now from the question,
In the cutoff region both junctions of the transistor are reverse biased. Hence the transistor in cut off does not conduct any currents except for small reverse saturation currents that flow across junctions. In cutoff condition the emitter current is zero and therefore the collector current consists of small reverse saturation currents. The transistor when used as a switch is operated in cutoff on condition and saturation regions which corresponds to switch off and on condition respectively.

So, option C is the correct answer

Note:
Reverse Biasing
The applied d.c. voltage that forestalls or greatly reduces current flow during a diode, transistor, etc. For example, a negligible current will flow through a diode when its cathode is formed more positively than its anode; the diode is then said to be reverse biased.

Application of transistor-
A transistor can use a little signal applied between one pair of its terminals to regulate a way larger signal at another pair of terminals. This property is called gain. It can produce a stronger output signal, a voltage or a current, which is proportional to a weaker input signal and thus, it can act as an amplifier. Alternatively, the transistors are often wont to turn current on or off during a circuit as an electrically controlled switch, where the quantity of current is decided by other circuit elements.