Name of the Organization : Haryana Public Service Commission
Name of the Exam : HCS (Ex.Br.) Main Exam
Subject : Electrical Engineering
Document Type : Previous Question Paper
Year : 2014
Website : http://hpsc.gov.in/en-us/
Download Sample/Model Question Paper : https://www.pdfquestion.in/uploads/11120-Electrical.pdf
HCS Electrical Engineering Main Exam Question Paper :
Electrical Engineering :
Code : 08
Time : 3 Hours
Max.marks : 150
Related : HPSC HCS Main Exam Civil Engineering Question Paper : www.pdfquestion.in/11108.html
Note:
i)Attempt five questions. All questions carry equal marks. Question number I is compulsory. Answer any to questions from Part I and two questions from Part II. The parts of the same questions must be answered together and must not be interposed between answers to other questions.
ii) In case of any discrepancy in the English and Hindi versions, English version will be taken as final.
1. Write critical notes on any four :
a. Memory interfacing in Microprocessor
b. Swing curve and equal area criterion
c. Wind Energy Conversion System
d. Wave propagation in bounded media
e. Sample and hold circuits
f. Superhetrodyne receivers
2. Part – I :
a. In free space, the magnetic flux density is given by as follows B=y2ax+ z2 ay+x2 az=Wb/m2
i. Show that B is a magnetic field.
ii. Find the magnetic flux through x=1,0<y<1 and 1<z<4
iii. calculate current density (J)
b. Define intrinsic impedance. A uniform plane wave in free space is given as follows Es=200 < 300 e-j250.ax V/m
Find :
i. Phase Constant (P)
ii. Angular frequency (w)
iii. Wavelength (y)
iv. Intrinsic impedance (n)
v. Magnetic field (Hs)
Q3. Explain briefly the early effect phenomenon in BJT (10)
For the circuit shown in Figure F = hr = 100,
i. Verify if transistor is in cut-off, saturation or in the active region
ii. Find Vo
c. What is the effect of gate capacitance of MOSFET in driving circuit when it is used in high frequency power switching applications like sine wave inverter or DC-DC converter? (10)
4. Using A-I substitution. determine the resistance between a and d, in below figure
b. Determine the current 1in below figure using ladder method Specific power supply voltage range, output logic 1 level voltage and output logic 0 level voltages for standard TTL gates.
Mechanical Engineering :
1. Write critical notes on any four of the following: (4X7= 28)
(a) Steering Gear Mechanism
(b) Allotropic forms of Pure lron
(c) Stirling Cycle with p-v and T-s diagrams
(d) Mohr’s Circle
(e) Routing, Scheduling and Dispatching
(D Supercharging of LC. Engines
Part -I :
2. (a) What are different types of Governors. Explain Sensitiveness, Hunting and Isochronism of Governors.
(b) Write Short notes on
I. PERT
II. CPM
III. ERP
3. (a) Draw the diagram of stress/strain for mild steel and Cast Iron and specify all the terminology related to stress/strain curve for mild steel.
(b) Distinguish between:
I. Resilience and Toughness
II. Malleability and Ductility
III. Endurance Life and Endurance Strength
4. (a) Draw the iron carbon diagram, and define the Eutectic and Eutectoid equation
(b) . Define Natural Frequency, Resonance, Time Period and Crtitical Speed of Shaft.Find the natural frequency of spring mass system shown in fig below
5. (a) Explain different types of Governing of I.C.Engines. Write briefly about the Rating of S.l and C.l Engines Fuels.
(b) Derive an Expression for LMTD for a heat exchanges and what is its significance
6. (a) i. Write the statement of Kelvin Planck and Clausius.
ii. In a steady-flow adiabatic turbine, the changes in the intemalenergy,enthalpy, kinetic energy and potential energy of the working fluid, liom inlet to exit, are -100 kJ/kg, -140 kJ/kg, -10 kJlkg and 0 KJ respectively. Find the amount of work developed by the turbine?
(b) i. Write short notes on Energy, Entropy, Enthrall.
ii. 85 kJ of heat is supplied to a closed system at constant volume. During the next process, the system rejects 90 kJ of heat at constant pressure while 20 kJ of work is done on it. The system is brought to the original state by an adiabatic process. The initial internal energy is 100 kJ. What is the quantity of work transfer during the process?