Basic Electronics (2110016) Question Bank CHAPTER-1 CIRCUIT CONCEPTS Questions: 1. Define the following

Coulombs Law Electric Force Conductors Insulators Magnetic Force Magnetic Flux Density 2. Explain in brief Amperes Law Electric Potential Voltage source Current source Capacitor Inductance 3. How the equivalent resistance is calculated for Resistors in Series and Parallel? 4. How the equivalent resistance is calculated for Capacitors in Series and Parallel? 5. How the equivalent resistance is calculated for Inductors in Series and Parallel? 6. Explain Kirchhoffs Law for Current with one example. 7. Explain Kirchhoffs Law for Voltage with one example. 8. What are the various measuring Instruments available for electrical parameters? 9. What is analogy between electrical and mechanical components? (Force-current & Force-Voltage Analogy) 10. Write short Note on Resistance Strain Gauge. MCQ: Q.1 Kirchhoff's laws are valid for A. linear circuit only B. passive time invariant circuits C. non-linear circuits only D. both linear and non-linear circuits Q.2 All the resistances in figure shown below are 1 each. The value of current in Ampere through the battery is

A. 1/15 B. 2/15 C. 4/15 D. 8/15 Q.3 Two resistors R1 and R2 given combined resistance of 4.5 when in series and 1 when in parallel, the resistance are A. 1.5 and 3 B. 2 and 2.5 C. 1 and 3.5 D. 4 and 0.5 Q.4 In given figure, the value of resistance R in is

A. 10 B. 20 C. 30 D. 40 Q.5 The unit of inductance is Henry. It can also be represented as A. V/Sec B. V - Sec C. V/A D. V - Sec/A Q.6 The energy stored in an inductor of inductance L Henry is represented as, A. i2L B. iL2 C. (1/2)L.i2 D. L2/i Q.7 The voltage induced in an inductor of L Henry is represented as, A. Li B. L di/dt

C. L/i D. L2i Q.8 A parallel plate capacitor has a capacitance of C farad. It area of the plates is doubled and the distance between them is half, the capacitance of the capacitor is A. 1C farad B. 2C farad C. 4C farad D. 16C farad Q.9 Which of the followings is the expression for energy stored in a capacitor A. Cv B. C dv/dt C. C/v D. (1/2)Cv2 Q.10 A branch of a network is said to be active when it consists of one A. resistor B. voltage source C. inductor D. capacitor

CHAPTER-2 CIRCUIT ANALYSIS TECHNIQUES Questions: 1. Consider the circuit shown in Figure 1. Reduce the portion of the circuit to the left of terminals ab to (a) a Thvenin equivalent and (b) a Norton equivalent. Find the current through R=16, and comment on whether resistance matching is accomplished for maximum power transfer. 2. Consider the circuit of Figure 2, including a dependent source. Obtain the Thvenin equivalent at terminals ab. 3. By means of nodal analysis, find the current delivered by the 10-V source and the voltage across the 10-resistance in the circuit shown in Figure-3 4. For the network shown in Figure 4, find the current delivered by the 10-V source and the voltage across the 3-resistor by means of mesh-current analysis. 5. Determine the voltage across the 20-resistor in the following circuit of Figure-5 with the application of superposition. 6. Use deltawye transformation for network reduction and determine the current through the 12-ohm resistor in the circuit of Figure-6 7. Determine the Thvenin and Norton equivalent circuits as viewed by the load resistance Rin the network of Figure-7 (i) Find the value of R if the power dissipated by Ris to be a maximum. (ii) Obtain the value of the power in part (b). 8. Reduce the circuit of Figure-8 to a Thvenin and a Norton equivalent circuit. 9. Find the Thvenin and Norton equivalent circuitsfor the configuration of Figure-9 as viewed from terminals ab. 10. Obtain the Thvenin and Norton equivalent circuits for the portion of the circuit to the left of terminals ab in Figure 10, and find the current in the 200-ohm resistance. 11. In the circuit given in Figure 11, determine the currentIthrough the 2-ohm resistor by (a) the nodalvoltage method, and (b) mesh-current analysis.

12. Find the voltage across the 8-A current source in the circuit of Figure 12 with the use of nodal analysis & Determine the current in the 0.5-resistor of the circuit by mesh analysis.

Figure.1 Figure.2

Figure.3 Figure.4

Figure.5 Figure.6

Figure.7 Figure.8

Figure.9 Figure.10

Figure.11 Figure.12

MCQ: 1. In an electrical network to neglect a current source the current source is:

a) Open Circuited. b) Short Circuited. c) Replaced by a capacitor. d) Replaced by an Inductor.

2. Which of the following theorem is applicable for both linear and nonlinear circuits?

a) Superposition theorem. b) Thevenin's theorem. c) Norton's theorem. d) none of these.

3. In an electrical network to neglect a voltage source the voltage source is:

a) Open Circuited. b) Short Circuited. c) Replaced by a capacitor. d) Replaced by an Inductor.

4. In figure, the total power consumed is a) 10 W b) 12 W c) 16 W d) 20 W

5. What is maximum power transfer condition? a) Rs = RL b) Rs < RL c) Rs > RL d) None of the above.

6. In Thevenins Theorem which term to be determined? a) Vth, Isc b) Vth,Rth c) Rth, Isc d) None of the above

7. In Nortons Theorem which term to be determined? a) Vth, Isc b) Vth,Rth c) Rth, Isc d) None of the above

8. In Thevenins equivalent circuit Rth is Parallel connection with Vth? a) True b) False c) May be d) None of the above

9. In Nortons equivalent circuit Rth is Parallel connection with Isc ? a) True b) False c) May be d) None of the above

10. Star network is also known as a) T-network b) X- network c) Y-network d) Z-network

CHAPTER-3 ANALOG BUILDING BLOCKS AND OPERATIONAL AMPLIFIERS Questions:

MCQ: 1. OPAMP is a/an: A Differential amplifier B Oscillator C Rectifier D None of the above

2. Voltage gain of an ideal op-amp is: A Infinite B Very high C Low D Very low

3. Bandwidth of an ideal op-amp is: A Infinite B Very high C Low D Very low

4. Output impedance of an ideal op-amp is: A Infinite B Very high C Low D Zero

5. CMRR of an ideal op-amp is: A Infinite B Very high C Low D Very low

1. Explain Ideal operational amplifier and its characteristics. 2. Explain Properties of practical op-amps. 3. Explain inverting & non-inverting amplifier. 4. Explain summing amplifier. 5. Explain Current-to-Voltage Amplifier, Current-to-current amplifier & Charge-to-charge amplifier. 6. Expalin integrator & differentiator. 7. Explain Inductorless (Active) Filters. 8. Define: i) OPEN-LOOP VOLTAGE GAIN A ii) INPUT RESISTANCE Ri iii) OUTPUT RESISTANCE Ro iv) Common-Mode Rejection Ratio (CMRR) v) INPUT OFFSET VOLTAGE VOS vi) INPUT BIAS CURRENT IB vii) INPUT OFFSET CURRENT IOS viii) Power-Supply Rejection Ratio (PSRR) ix) Slew Rate 9. Explain operation of analog computers. 10. Explain practical application of op-amp: An automotive power-assisted steering system.

6. Slew rate of an ideal op-amp is:

A Infinite B Very high C Low D Very low

7. Op-amp is a: A Voltage-controlled voltage source (VCVS) B Voltage-controlled current source (VCCS) C Current-controlled voltage source (CCVS) D Current-controlled current source (CCCS)

8. Op-Amp uses: A Only +ve Voltage B Only ve voltage C Dual supply, i.e., Vcc D None of the above

9. The gain and CMRR can also be expressed in _____. A Newtons B Decibels C Volt/amperes D None of the above 10. The typical open loop gain of an IC741 OPAMP is __. A 2 x 105 B 2 x 106 C Infinite D Zero 11. Slew tare of IC 741 OPAMP is _______. A 0.3 V/V B 0.5 V/s C 0.5 mV/V D 0.3 kV/V

CHAPTER-4 DIGITAL BUILDING BLOCKS AND COMPUTER SYSTEMS Questions: 1. Obtain the truth table for the logic block shown in Figure 2. For the NOR and inverter realizations shown in Figure, find the truth table, the type of gate realized, and the expression for the logic output,in each case. 3. Draw the logic diagram for the following Boolean expressions (without any simplification). 4. 5.

6. Draw the logic diagram of an SR latch using only NAND gates, and obtain the truth table for that implementation. 7. J and K are the external inputs to the JKFF shown in Figure. Note that gates 1 and 2 are enabled only when the clock pulse is high. Consider the four cases of operation and explain what happens.

8. Draw a block diagram for a 2-to-4 decoder. Obtain the truth table, and develop a logic diagram. 9. Show a block diagram of a 4-bit, parallel-input shift-right register and briefly explain its operation. 10. What is the basic difference between the weighted resistor and the R2R ladder D/A converters?

MCQ: 1. Convert hexadecimal value 16 to decimal.

A. 2210 B. 1610

C. 1010 D. 2010

2. Convert the following decimal number to 8-bit binary. 187

A. 101110112 B. 110111012

C. 101111012 D. 101111002

3.The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.

A. A = 1, B = 1, C = 0

B. A = 0, B = 0, C = 0

C. A = 1, B = 1, C = 1

D. A = 1, B = 0, C = 1

4. The output of an exclusive-NOR gate is HIGH if ________.

A. the inputs are equal

B. one input is HIGH, and the other input is LOW

C. the inputs are unequal

D. none of the above

5.Determine the values of A, B, C, and D that make the sum

term equal to zero.

A. A = 1, B = 0, C = 0, D = 0

B. A = 1, B = 0, C = 1, D = 0

C. A = 0, B = 1, C = 0, D = 0

D. A = 1, B = 0, C = 1, D = 1

6.Which of the following expressions is in the sum-of-products (SOP) form?

A. (A + B)(C + D)

B. (A)B(CD)

C. AB(CD)

D. AB + CD

7. How is a J-K flip-flop made to toggle?

A. J = 0, K = 0

B. J = 1, K = 0

C. J = 0, K = 1

D. J = 1, K = 1

8.A positive edge-triggered D flip-flop will store a 1 when ________.

A. the D input is HIGH and the clock transitions from HIGH to LOW

B. the D input is HIGH and the clock transitions from LOW to HIGH

C. the D input is HIGH and the clock is LOW

D. the D input is HIGH and the clock is HIGH

9.If both inputs of an S-R flip-flop are LOW, what will happen when the clock goes high?

A. No change will occur in the output.

B. An invalid state will exist.

C. The output will toggle.

D. The output will reset.

10. Implementation of the Boolean expression results in ________.

A. three AND gates, one OR gate

B. three AND gates, one NOT gate, one OR gate

C. three AND gates, one NOT gate, three OR gates

D. three AND gates, three OR gates

CHAPTER-5 SIGNAL PROCESSING Questions: 1. Draw and explain the block diagram of anti-noise system to suppress the noise in an aircraft. 2. Differentiate between continuous and discrete signals. 3. Explain how a basic signal processing system works. 4. What are the Common signal processing operations? 5. Explain the Basic elements of digital communication systems. 6. Find expressions for the Fourier coefficients for the following waves: (a) Rectangular pulse train (b) Triangular wave (c) Sawtooth wave (d) Square wave (e) Half-rectified sine wave 7. Explain the frequency translation process with help of product modulator. 8. Explain sampling with help of switching sampler. 9. Explain the noise in the channel in any communication system. 10. Explain the following properties of signals with example of each: (a) Periodicity and Causality (b) Evenness and Oddness (c) Energy-type and power type. MCQ: Q.1 Channel is a) medium b) signal c) carrier d) none of these Q.2 Analog signal varies with a) sampling time b) time continuously c) sampling frequency d) none of these Q.3 Discrete signal is represented by a) coding b) modulation c) demodulation d) sequence of samples Q.4 Carrier signal has

a) constant magnitude b) constant frequency c) variable frequency d) variable time Q.5 Modulating signal has a) low frequency b) low modulation c) high frequency d) none of these Q.6 In order to reduce interference, the signal should be a) amplified b) multiplied c) demodulated d) modulated Q.7 Messages travel from transmitter to receiver with help of a) Transmitter b) Receiver c) channel d) antennas Q.8 An example for an analog signal a) Sine wave b) impulse signal c) sample signal d) None of these Q.9 Non electric signal is converted into electrical signal by a) transmitter b) receiver c) line d) none of these Q.10 In amplitude modulation, amplitude is a) constant b) zero c) variable d) none of these

CHAPTER-6 COMMUNICATION SYSTEMS Questions: Q.1 Explain the mode of propagation of electromagnetic wave in free space and atmosphere. Also define Signal multipath, Signal fading and Line of Sight. Q.2 Define the term Antenna, Give the functions of an Antenna. Also Define (a) Radiation Intensity (b) Radiation resistance (c)Radiation pattern (d)Power Gain (e)Beam width (f)Polarization (g) Yagi Uda Antenna Q.3 What is modulation? What is the need of modulation? Explain Amplitude modulation with suitable waveform, also define modulation Index. Q.4 Explain the generation of DSB SC AM. What is envelop detector? Also Give the significance of VSB AM. Q.5 Define Carsons Rule. Give five difference between AM and FM. Q.6 Draw and Explain the block diagram of superhetrodyne receiver. Q.7 State Sampling Theorem. Define Companding. Q.8 What is multiplexing? Explain TDM. Q.9 Explain PCM coding Scheme. Q.10 Explain mode of propagation of transmission line. MCQ: Q.1 Coaxial transmission line commonly operates in (a) TE mode (b) TM mode (C) TEM mode (d)none Q.2 VCO is (a) Voltage control oscillator (b)Video control oscillator (C) Voltage common oscillator (d) Video Common oscillator Q.3 What is the Range of modulation Index in AM (a) 0 to 1 (b) -1to 0 (C) 1 to (d)-1 to 1 Q.4 What is the Range of modulation Index in FM (a) 0 to 1 (b) -1to 0 (C) 1 to (d)-1 to 1 Q.5 What is Nyquist Criteria for sampling (a) Fs Fm (b) Fs 2 Fm (C) Fs Fm (d Fs 2 Fm Q.6 What is SNR (a) Signal to noise ratio (b) Signal to noise receiver (C) Signal to noise reception (d)Signal to noise repeater Q.7 PCM is (a) Digital coding scheme (b) Analog coding scheme (C) Both (d)none Q.8 PAM is (a) Pulse Amplitude Modulation (b) Pulse Analog Modulation (C) Pulse Angular Modulation (d) Pulse And Modulation Q.9 TDM is (a) Time Division Multiplexing (b) Time Duration Multiplexing (C) Time Dependent Multiplexing (d) Time Double Multiplexing

Q.10 RF Stands for (a) Radio Frequency (b) Receiver Frequency (C) Rejection Frequency (d) Repeater frequency

CHAPTER-7 BASIC CONTROL SYSTEMS Questions: 1. Write notes on open loop control systems and closed loop control systems with the help of neat block diagrams. Give some suitable real life examples of both types of systems. 2. Compare Open Loop versus Closed Loop control systems. 3. Classify the feedback control systems by purpose. 4. Define & explain the transfer function using Block diagram of an elementary feedback control system. 5. Write at least six block diagram reduction techniques with block diagrams. 6. Explain the effect of feedback on Sensitivity, Stability, Dynamic response and Bandwidth. 7. Explain dynamic response of control system with the help of neat block diagram. 8. Define & Explain steady state error. 9. Give the classification of Feedback Control Systems by Control Action. 10. Explain Digital Control System with the help of example. MCQ: 1. In an open loop control system A Output is independent of control input B Output is dependent on control input C Only system parameters have effect on the control output D None of the above 2. A control system in which the control action is somehow dependent

on the output is known A Closed loop system B Semi-closed loop system C Open system D None of the above 3. An automatic toaster is a ______ loop control system. A open B closed C partially closed D any of the above 4. The initial response when the output is not equal to input is called A Transient response B Error response C Dynamic response D Either of the above 5. _______ is a closed loop system. A Auto-pilot for an aircraft B Direct current generator C Car starter D Electric switch 6. The transfer function is applicable to which of the following?

A Linear and time-in variant systems B Linear and time-variant systems C Linear systems D Non-linear systems 7. With feedback _____ increases. A system stability B sensitivity C gain D effects of disturbing signals 8. Steady State Error for Type-0 system for unite step input is __________. A Finite B Infinite C Zero D All of above 9. Steady State Error for Type-2 system for unite ramp input is __________. A Finite B Infinite C Zero D All of above 10. Steady State Error for Type-1 system for unite acceleration input is

__________. A Finite B Infinite C Zero D All of above