Home › Quizzes › Test 4 - Analog Circuits (Electronics and Communication)

Test 4 - Analog Circuits (Electronics and Communication)

Test 4 of Analog Circuits (Electronics and Communication)

24 Questions Published
Play Quiz Practise this topic out loud

Questions

Question 1 Multiple Choice (Single Answer)

For the circuit shown below, assume that the zener diode is ideal with a breakdown voltage of 6 Volts. The waveform observed across R is

Question 2 Multiple Choice (Single Answer)

For the Zener diode shown in the figure, the Zener voltage at the knee is 7 V. The knee current is negligible and the Zener dynamic resistance is 10 $\Omega$. If the input voltage (Vi) ranges from 10 V to 16 V, what will be the range of out put voltage (V0)?

  1. 7.00 V to 7.29 V
  2. 7.14 V to 7.29 V
  3. 7.14 V to 7.43 V
  4. 7.29 V to 7.43 V
Question 3 Multiple Choice (Single Answer)

In an ideal differential amplifier shown in figure, a large value of RE

  1. increases both the differential and common-mode gains
  2. increases the common-mode gain only
  3. decreases the differential mode gain only
  4. decreases the common-mode gain only
Question 4 Multiple Choice (Single Answer)

A regulated power supply as shown in the figure below has an unregulated input (UR) of 15 V and generates a regulated output, i.e. V<sub style="font-family:" arial;="">out.

If the unregulated voltage increases by 20%, the power dissipation across the transistor Q1
( Note: The ground has been shown by the symbol $\nabla$.)

  1. increases by 20%
  2. increases by 50%
  3. remains unchanged
  4. decreases by 20%
Question 5 Multiple Choice (Single Answer)

The Zener diode in the regulator circuit shown in figure has a Zener voltage of 5.8 Volts and a Zener knee current of 0.5 mA. The maximum load current drawn from this circuit ensuring proper functioning over the input voltage range between 20 and 30 Volts, is

  1. 23.7 mA
  2. 14.2 mA
  3. 13.7 mA
  4. 24.2 mA
Question 6 Multiple Choice (Single Answer)

In the CMOS inverter circuit shown, if the transconductance parameters of the NMOS and PMOS transistor are kn = kp = $\mu$nC0x $\dfrac{W_n}{L_n}$=$\mu$p Cox $\dfrac{W_p}{L_p}$= 40 $\mu$A/ V2 and their threshold voltage are VTHn = |VTHp| = 1V, the current I is

  1. 0 A
  2. 25 $\mu$A
  3. 45 $\mu$A
  4. 90 $\mu$A
Question 7 Multiple Choice (Single Answer)

The voltage eo indicated in figure has been measured by an ideal voltmeter. Which of the following can be calculated?

  1. Bias current of the inverting input only
  2. Bias current of the inverting and non-inverting inputs only
  3. Input offset current only
  4. Both the bias currents and the input offset current
Question 8 Multiple Choice (Single Answer)

Both transistors T1 and T2 in figure have a threshold voltage of 1 Volt. The device parameters K1 and K2 of T1 and T2 are, respectively, 36 A/V2 and 9 A/V2. The output voltage V0 is

  1. 1 V
  2. 2 V
  3. 3 V
  4. 4 V
Question 9 Multiple Choice (Single Answer)

Three identical amplifiers with each one having a voltage gain of 50, input resistance of 1 K$\Omega$and output resistance of 250 $\Omega$, are cascaded. The open circuit voltage gain of the combined amplifier is

  1. 49 dB
  2. 51 dB
  3. 98 dB
  4. 102 dB
Question 10 Multiple Choice (Single Answer)

For the op-amp circuit shown in the figure, V0 is

  1. – 2 V
  2. – 1 V
  3. – 0.5 V
  4. 0.5 V
Question 11 Multiple Choice (Single Answer)

The transfer characteristic for the precision rectifier circuit shown below is
(assume ideal OP-AMP and practical diodes)

Question 12 Multiple Choice (Single Answer)

An amplifier without feedback has a voltage gain of 50, input resistance of 1 K$\Omega$ and output resistance of 2.5 K$\Omega$. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2, is

  1. $\dfrac{1}{11}$ K$\Omega$
  2. $\dfrac{1}{5}$ K$\Omega$
  3. 5 K$\Omega$
  4. 11 K$\Omega$
Question 13 Multiple Choice (Single Answer)

In the circuit shown below, the op-amp is ideal, the transistor has VBE = 0.6 and $\beta$ = 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of the op-amp.

  1. Positive feedback, V = 10 V
  2. Positive feedback, V = 0 V
  3. Negative feedback, V = 5 V
  4. Negative feedback, V = 2 V
Question 14 Multiple Choice (Single Answer)

In the transistor amplifier circuit shown in the figure below, the transistor has the following parameters:
$\beta_{DC} = 60, V_{BE} = 0.7V, h_{ie} \rightarrow \infty, h_{fe} \rightarrow \infty$
The capacitance Cc can be assumed to be infinite.

In the figure above, the ground has been shown by the symbol $\nabla$

The small-signal gain of the amplifier vc/vs is

  1. - 10
  2. - 5.3
  3. 5.3
  4. 10
Question 15 Multiple Choice (Single Answer)

Two identical NMOS transistors M1 and M2 are connected as shown below. V bias is chosen so that both transistors are in saturation. The equivalent gm of the pair is defined to be $ \dfrac{\partial I_{out}}{\partial V_i}$at constant Vout
The equivalent gm of the pair is

  1. the sum of individual gm's of the transistors
  2. the product of individual gm's of the transistors
  3. nearly equal to the gm of M1
  4. nearly equal to $\dfrac{g_m}{g_o}$of M2
Question 16 Multiple Choice (Single Answer)

The value of C required for sinusoidal oscillations of frequency 1 kHz in the circuit of the figure is

  1. $\dfrac{1}{2\pi}\mu F$
  2. 2$\pi$$\mu F$
  3. $\dfrac{1}{2\pi \sqrt6}\mu F$
  4. 2$pi$$\sqrt6$$\mu F$
Question 17 Multiple Choice (Single Answer)

In the transistor amplifier circuit shown in the figure below, $\beta_{DC} = 60, V_{BE} = 0.7V, h_{ie} \rightarrow \infty, h_{fe} \rightarrow \infty$
The capacitance Cc can be assumed to be infinite.


If $\beta_{DC}$ is increased by 10%, the collector-to-emitter voltage drop
(Note: The ground has been shown by the symbol $\nabla$.)

  1. increases by less than or equal to 10%
  2. decreases by less than or equal to 10%
  3. increases by more than 10%
  4. decreases by more than 10%
Question 18 Multiple Choice (Single Answer)

For the BJT circuit shown, assume that the $\beta$ of the transistor is very large and VBE = 0.7 V. The mode of operation of the BJT is

  1. cut-off
  2. saturation
  3. normal active
  4. reverse active
Question 19 Multiple Choice (Single Answer)

In a full-wave rectifier using two ideal diodes, Vdc and Vm are the dc and peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier are

  1. Vdc = $\dfrac{V_m}{\pi}$, PIV = 2Vm
  2. Idc = 2$\dfrac{V_m}{\pi}$, PIV = 2Vm
  3. Vdc = 2$\dfrac{V_m}{\pi}$, PIV = Vm
  4. Vdc $\dfrac{V_m}{\pi}$, PIV = Vm
Question 20 Multiple Choice (Single Answer)

The circuit using a BJT with $\beta$ = 50 and VBE = 0.7 V is shown in figure. The base current IB and collector voltage VC are respectively

  1. 43 $\mu$A and 11.4 volts
  2. 40 $\mu$A and 16 volts
  3. 45 $\mu$A and 11 volts
  4. 45 $\mu$A and 10 volts
Question 21 Multiple Choice (Single Answer)

Given the ideal operational amplifier circuit shown in figure indicate the correct transfer characteristics assuming ideal diodes with zero cut-in voltage.

Question 22 Multiple Choice (Single Answer)

The output voltage of the regulated power supply shown in figure is

  1. 3V
  2. 6V
  3. 9V
  4. 12V
Question 23 Multiple Choice (Single Answer)

In the voltage regulator shown in the figure, the load current can vary from 100 mA to 500 mA. Assuming that the Zener diode is ideal (i.e., the Zener knee current is negligibly small and Zener resistance is zero in the breakdown region), the value of R is

  1. 7 $\Omega$
  2. 70 $\Omega$
  3. $\dfrac{70}{3}$ $\Omega$
  4. 14 $\Omega$
← Back to Quizzes