Department of Electrical Engineering/Viva Voce Questions

B. Tech.

#	Question	Answer	Professor	Year
1	What are types of strain guage?		Alok Barua	Nov 2017
2	Why semicondor Strain guage are not used widely ?	1. There G factor won't be same because doping can't be precisely controlled.		Nov 2017
3	What are the typical values for sensitivity for Thermocouple based Temp Sensors?	In the order of microvolts per degree celsius.	Alok Barua	Nov 2017
4	Draw Load Cell type Strain Gauge & Beam type Strain Guage			Nov 2017
5	Draw the Nyquist plot for a given transfer function. What are the axes called in the nyquist space?		AK Deb	Nov 2017
6	What is root locus, which two criteria satisfied by the point on root locus?		AK Deb	Nov 2017
7	What is Zeta called ?	Damping Ratio	BM Mohan	Nov 2017
8	What is region on s plane for zero damping and negative damping?>		BM Mohan	Nov 2017
9	Draw the eqv. circuit for DC motor. What are the ways to control its speed?	Field control and Armature control.	BM Mohan	Nov 2017
10	What is torque speed characteristics of Synchronous generator?		Saurav Pramanik	Nov 2017
11	Why DC current required in synchronous machine?		Saurav Pramanik	Nov 2017
12	Draw the coils of Transformer and polarity.		Saurav Pramanik	Nov 2017
13	Something with short circuit test. Connect a wattemeter to measure power loss. Explain the principle of reflective current on primary.		Saurav Pramanik	Nov 2017
14	Energy meter and Power meter working		Avishek Chatterjee	Nov 2017
15	Thevnin theorem		Avishek Chatterjee	Nov 2017
16	Which motor used in locomotive engine ?		Avishek Chatterjee	Nov 2017
17	Draw an OR gate using NAND gates.		Avishek Chatterjee	Nov 2017
18	Maximum power theorem with a modification.		Avishek Chatterjee	Nov 2017
19	Explain PMMC meter, Moving Iron Ammeter. How does it work?		Avishek Chatterjee	Nov 2017
20	What will happen if I use PMMC to measure AC/DC?		Avishek Chatterjee	Nov 2017
21	We know that cealing fan speed is regulated by rotating regulator knob. When you remove the fan blades then you are unable to do so. Why ?		A Routray	Nov 2017
22	How can you make 1 Farad capacitor			Nov 2017
23	How can you charge a capcitor with 220V dc voltage source ?.. Value of R required for charging, calculate power loss without integrating		Suman Maiti	Nov 2017
24	draw B-H curve for aluminium and iron core,			Nov 2017
25	Circuit Diagram Instrumentation Amplifier		Asish Maity	Nov 2017
26	What is RTD, functioning of thermistor		Karabi Biswas	Nov 2017
27	Write the equation of sampling signal in time domain also find its fourier transform		Debdoot Sheet	Nov 2017
28	LVDT		Karabi Biswas	Nov 2017
29	Basic control block diagram and its root locus		Arun Ghosh	Nov 2017
30	Given a transfer function find its steady state value and the settling time		Arun Ghosh	Nov 2017
31	How does AD590 woprks?		Alok Barua	Nov 2017
32	Working of MI type and PMMC type ammeter? Comment about avg value of cuurent in both.		Avishek Chatterjee	Nov 2017
33	Draw Bonded metal wire strain gauge and bonded metal foil strain gauge		Alok Barua	Nov 2017
34	If we are applying axial strain, what type of arrangment is made in metal foil strain gauge to correct the error due to transverse strain?		Alok Barua	Nov 2017
35	What are the applications of synchronous machine?		Saurav Pramanik	Nov 2017
36	Draw PI controller using opamp?		Siddarth Sen	Nov 2017
37	A wire carrying a current of 5A how to measure this using the micro processer?	decrease the current down to less current using the current transformer then measure	Suman Maiti	Nov 2017
38	what is controllability?		A K Deb	Nov 2017
39	Draw circuit diagram of a synchronous 2 bit counter		Alok Barua	Nov 2017
40	1st year flourocent lamp experiment circuit diagram			Nov 2017
41	Draw circuit diagram of LVDT and its "symbol"		Karabi Biswas	Nov 2017
42	You have given 2 capacitance - C1 and C2. Also voltage Vin is given. Realize Vout = Vin*(C1/C2)		Karabi Biswas	Nov 2017
43	30 cm scale is given. What is range,resolution and span for this scale.		Karabi Biswas	Nov 2017
44	A DC voltage source and a circuit is given. What configuration should be used such that irrespective of the polarity of the battery the circuit should work fine.	Use full wave rectifier circuit configuration using 4 diodes	Ashish Maity	Nov 2017
45	Difference between Discrete signals and digital signals	Digital can have only 2 states - ON and OFF	Nirmalya Ghosh	Nov 2017
46	Circuit diagram of transformer		Arun Ghosh	Nov 2017
47	GIven a transfer function draw bode plot. Then find its impulse response. Finally draw root locus		Arun Ghosh	Nov 2017
48	Sampling theorem		Debdoot Sheet	Nov 2017
49	Draw spectrum of white light. If it is sampled with 1kHz sampling frequency what will happen?		Debdoot Sheet	Nov 2017
50	Draw the V-I characteristics of a practical diode and write down expressions for calculating its static and dynamic resistance.		Debdoot Sheet	Nov 2017
51	At which point on the V-I characteristic curve is the static resistance equal to the dynamic resistance.		Debdoot Sheet	Nov 2017
52	Draw the circuit which you would use for measuring the V and I values for plotting the V-I characteristics curve of the practical diode. You are provided with a 5V battery as your voltage source.		Debdoot Sheet	Nov 2017
53	You are given a 3.3V Zener diode which is connected with a random signal generator located to its left with a 1k resistance connecting one lead of the signal generator to the cathode of the diode, and anode of the diode is connected directly to the other lead of the signal generator. The signal generator generates discrete time random valued voltage pulses following a normal distribution with mean of 0V and standard deviation of 3 V. That would be the pdf of the signals sensed across the leads of the Zener diode.		Debdoot Sheet	Nov 2017
54	When speaking your frequency of signals range in 80-800 Hz and I am sampling your speech at 1kHz, what will I hear if I playback the recorded signal.		Debdoot Sheet	Nov 2017
55	Given a transfer function (s+a)/((s+b)*(s+c))..where b>0,c>0 and for case of a>0 and a<0 comment on phase margin,stability		SK
56	60HZ rated transformer should be used with supply of 50Hz or not?	He said it can't be used	Random Guy	Apr 2017
57	Full Wave Rectifier (Diode) and Fourier Transform (without integrating) of the output	Even Harmonics	Kapat	Apr 2017
58	what is transfer function, freq response, loop transfer function, phase margin			Apr 2017
59	why phase margin is called phase margin			Apr 2017
60	what is temp control problem			Apr 2017
61	how will you measure the freq of 230V power line with help of embedded system			Apr 2017
62	what signals are used for freq response			Apr 2017
63	resolve square wave in its freq components			Apr 2017
64	what nyquist stability criteria			Apr 2017
65	Do you feel like an Electrical Engineer?	No	All	Apr 2017
66	Have you forgotten everyting that was taught to you in the past 4 years?	Sir, this question is out of syllabus		Apr 2017
67	Do you feel like an Electrician?	Maybe	All	Apr 2017
68	What is the R value of a resistor with Red Red Blue color coding ?	You should give JEE again		Apr 2017
69	Can you make a potential divider with output voltage more than input voltage using a rheostat and a voltage source?	Yes	BM Mohan	Apr 2017
70	What is the difference between a normal conductor and a bundled conductor?	Power Systems	Paramanik	Apr 2017
71	Normal transient questions from power electronics		TKB	Apr 2017
72	A network question involving infinite current(impulse current) in a conductor		TKB	Apr 2017
73	On a RC circuit		TKB	Apr 2017
74	Dirichlet condition	Signals and Systems	RRS	Apr 2017
75	Draw Sinx/x and which filter has this impulse response?Is it feasible?If not then how to make it feasible?	Signals and Systems	RRS	Apr 2017
76	How will you rotate a single phase induction machine in opposite direction ?		TKB	Apr 2017
77	If I switch supply terminals of a DC shunt motor, will it rotate in opposite direction? Justify your answer.		TKB	Apr 2017
78	What is the frequency response of function f(t) = cos(wt) ?		S Patra	Apr 2017
79	bode plot of G(s) = e^(-2s) .	draw graphs for gain and phase	S Patra	Apr 2017
80	draw a bridge circuit diagram with 2 diodes and 2 thyristor for 1 phase AC to DC converter. Show input and output signals		TKB	Apr 2017
81	Equivalent circuit diagram for Medium transmission line?		Paramanik	Apr 2017
82	When we increase the load of transformer, why the output voltage falls ?	due to leakage inductance	AK Pradhan	Apr 2014
83	Why the leakage inductance of transformer is in series ?		AK Pradhan	Apr 2014
84	How an IIR filter is implemented ?	with a recursive equation of output	Anirban Mukherjee	Apr 2014
85	What is the ideal pulse for Nyquist criterion ?	sinc	Anirban Mukherjee	Apr 2014
86	What are the different kind of interrupts, explain	Hardware, Software and priority interrupt controller use	Anirban Mukherjee	Apr 2014
87	Find the relationship between eigenvalues of a matrix and its trace and determinant ?	trace = sum of eigenvalues ; det = prdct of eigenvalues	S Patra	Apr 2014
88	For LVDT if the vibration has a freq f what should be the freq of ac voltage applied ?	10 times of f	PKD	Apr 2014
89	What would you use to measure petrol at a petrol pump? ( would you use volumetric flow meter or mass flow meter)		PKD	Apr 2014
90	Draw the cross sectional diagram of a LVDT.	Do not draw the simple diagram, rather the one where current in coils is shown via dot and cross convention	PKD	Apr 2014
91	Do you know what SPI is?	Serial peripheral interface	Anirban Mukherjee	Apr 2014
92	Draw the time response of the given system for a step input	Non-Minimun phase response funda	S Patra	Apr 2014
93	What is BPSK? PSK?	refer to datacomm	Alok Barua, A Routray	Apr 2014
94	you have a black box containing resistance and capacitance, you dunno the values.. how will u find out in lab..	feed in sine wave by signal generator and see response	S Kapat	Apr 2014
95	what will be the output if u feed in sine wave? how will u determine R,C		S Kapat, GD Ray	Apr 2014
96	u design a FIR filter in lab of 5th order and cutoff frequency is 500Hz.and sampling rate is 5Hz. but theoretically, u observe that the sampling frequency is 3KHz. What is the observed cutoff frequency	300Hz	A Routray	Apr 2014
97	u have a 50 Hz signal, what is the minimum sampling rate	we answered 100Hz, he said think on this! :P	A Routray	Apr 2014
98	what is beta in thermistor	instru notes	Alok Barua	Apr 2014
99	draw a graph of temperature versus resistance of a thermistor for two beta values	instru notes	Alok Barua	Apr 2014
100	what should be beta value for higher sensitivity	instru notes	Alok Barua	Apr 2014
101	typical range of beta values	instru notes	Alok Barua	Apr 2014
102	in which temperature sensor, lead wire resistance comes into play	instru notes	Alok Barua	Apr 2014
103	what is cold junction compensatn? how to do it?	AD590	Alok Barua	Apr 2014
104	Its structure types, how does AD590 compensate?		Alok Barua	Apr 2014
105	in RTD mueller bridge, how do u transmit	telemetry system	Alok Barua	Apr 2014
106	what is the typical staructure, frequency etc	instru notes	Alok Barua	Apr 2014
107	some questions on PWM, what is PWM, draw a typical PWM with delta = 10%, 90%		S Kapat, GD Ray	Apr 2014
108	how to find average voltage in a pwm		S Kapat, GD Ray	Apr 2014
109	if you have to feed this average voltage to a dc circuit, how will u feed it		S Kapat, GD Ray	Apr 2014
110	what is channel coding, how is data transmitted across a medium	datacomm	Anirban Mukherjee	Apr 2014
111	Draw the cross sectional view of an LVDT.	instru notes	PKD	Apr 2014
112	Draw the flow profile of an orifice meter( liquid flow lines)	instru notes	PKD	Apr 2014
113	Is capacitor a linear device	control	S Patra	Apr 2014
114	Gave the T.F of a plant and a controller with unity negative feedback and asked about the stability of the individual components as well as the entire system	control	S Patra	Apr 2014
115	Power losses in a transformer, what is the current flowing in the primary winding called?	et	AKP	Apr 2014
116	How do you find the T.F of a DC motor	refer control systems lab manual		Apr 2014
117	How do you find the values of unknown R and C using a oscilloscope and a battery(multimeter not avbl)	2 unknowns 2 equations, one will be unit step response and finding time constant		Apr 2014
118	in a LVDT draw the voltage wave forms given the circiut(take care of dots on the coils)	instru notes		Apr 2014
119	using an opamp,2 Resistor and 2 capacitors develop a 1st order ckt, a 2nd order ckt,			Apr 2014
120	minimum number of capacitors and inductors or their combinations reqd to make a 2nd order ckt			Apr 2014
121	uncharged capacitor connected to a battery considered short ckt.explain.			Apr 2014
122	why is modulation required in communication			Apr 2014
123	what is rotameter? explain	A Barua's book	PKD	Apr 2014
124	explain current transformer?		AK Pradhan	Apr 2014
125	characteristics of hot wire anemometer		AK Pradhan	Apr 2014
126	Draw the diagram of a flapper nozzle system, it's characteristic plot and derive its expression, hence the gain value		PKD	Apr 2014
127	You have a voltage signal lagging the current by some angle theta, develope a digital system to measure the power accurately		AK Pradhan	Apr 2014
128	both the signals have spikes somewhere and possibly various other harmonics due to noise			Apr 2014
129	Serial or parallel communication?----- older printers, USB		Anirban Mukherjee	Apr 2014
130	Write the Parsevals theorem's expression for input x(t) and output y(t)			Apr 2014
131	Given a system G(s)=1/((s+2)(s-2)), would it be stable? If it might be stable given some conditions, what could they be? (specify the ROC)			Apr 2014
132	What is the meaning of having points for negative frequency in a Nyquist plot			Apr 2014
133	Draw the frequency response of low pass filter. If one forgets the negative frequency part, why is the filter non realisable?	Complex filter coefficients	A Routray	Apr 2014
134	Depict the block diagram of a temperature control system for a industrial plant		GD Ray	Apr 2014
135	How would you interface 2 chips operating at different frequencies		S Kapat	Apr 2014
136	IEEE 488: Describe the functioning of Handshaking signals		Alok Barua	Apr 2014