In the linear regulator circuit shown, the base to emitter voltage  of the BJT is 0.6 V . The Zener diode clamps the base voltage to 5.4 V. Ignore the biasing current of the Zener diode and BJT.

The maximum possible efficiency of the regulator circuit is  %

(Round off to one decimal place)

A BJT biasing circuit is shown in the figure, where  and . The Quiescent Point values of  and  are respectively

The Zener diode in circuit has a breakdown voltage of . The current gain  of the transistor in the active region in 99. Ignore base-emitter voltage drop . The current through the 20Ω resistance in milliamperes is _________ (Round off to 2 decimal places).

In the BJT circuit shown, beta of the PNP transistor is 100. Assume . .

The voltage across  will be 5 V when  is ……… kΩ. (Round off 2 decimal places)

In the circuit shown in the figure, the bipolar junction transistor (BJT) has a current gain. The base-emitter voltage drop is a constant. The value of the Thevenin equivalent resistance  (in ) as shown in the figure is ________(up to 2 decimal places).

The circuit shown in the figure uses matched transistors with a thermal voltage . The base currents of the transistors are negligible. The value of the resistance R in  that is required to provide 1 bias current for the differential amplifier block shown is __________ . (Give the answer up to one decimal place.)

For the circuit shown in the figure below, it is given that . The transistor has and when the B-E junction is forward biased.

For this circuit, the value of  is

A transistor circuit is given below. The Zener diode breakdown voltage is 5.3V as shown. Take base to emitter voltage drop to be 0.6V. The value of the current gain  is __________.

In the given circuit, the silicon transistor has  and a collector voltage . Then the ratio of  and  is ____________.         

When a bipolar junction transistor is operating in the saturation mode, which one of the following statements is TRUE about the state of its collector – base (CB) and the base – emitter (BE) junctions?

The transistor in the given circuit should always be in active region. Take , . The maximum value of RC in  which can be used, is __________.

The transistor used in the circuit shown below has a of 30 and  is negligible.

If the forward voltage drop of diode is 0.7V, then the current through collector will be

The transistor circuit shown uses a silicon transistor with  and a dc current gain of 100. The value of  is

Two perfectly matched silicon transistors are connected as shown in the figure. Assuming the β of the transistors to be very high and the forward voltage drop in diodes to be 0.7V, the value of current I is

The common emitter forward current gain of the transistor shown is .

The transistor is operating in

The three-terminal linear voltage regulator is connected to a  load resistor as shown in the figure. If  is 10 V, what is the power dissipated in the transistor?

Consider the circuit shown in figure.  If the β of the transistor is 39 and  is 20nA and the input voltage is +5V, then transistor would be operating in

The common emitter amplifier shown in Figure is biased using a 1mA ideal current source. The approximate base current value is:        

Two perfectly matched silicon transistors are connected as shown in figure. The value of the current I is

A bipolar junction transistor (BJT) is used as a power control switch by biasing it in the cut-off region (OFF state) or in the saturation region (ON state). In the ON state, for the BJT

In the Schmitt trigger circuit shown in figure, if , the output logic low level  is        

In the circuit of Figure, assume that the transistor has . The value of collector current  of the transistor is approximately

In the circuit shown in Figure, the current gain (β) of the ideal transistor is 10. The operating point of the transistor  is

For the circuit shown in Figure, and . Determine

In the circuit of fig, the value of the base current  will be

One of the applications of current mirror is:

A NPN, silicon transistor is meant for low-current audio amplification. Match its following characteristics against their values:

Characteristics                      Values

(a)                       (P) 0.7V

(b)                       (Q) 0.2V

(c)                       (R) 6V

                                           (S) 50V

In the transistor circuit shown in figure, collector-to-ground voltage is +20V. Which of the following is the probable cause of error?

Figure below shows a common emitter amplifier. The quiescent collector voltage of the circuit is approximately