Defense Research & Development Organization (DRDO) works under Department of Defense Research and Development of Ministry of Defense.

DRDO every year conducts a Scientist Entry Test (SET) on all India basis for the recruitment of scientists ‘B’ posts.

Essential Qualification:-

Atleast First Class Bachelor’s Degree in Engineering or Technology (in relevant Subject/ Discipline) or Metallurgy (Material Science & Engg / Metallurgical Engg) for vacancies in Engineering disciplines atleast First Class Master’s Degree in relevant Science subjects or Mathematics, as applicable, for vacancies in other disciplines

Final Year students whose results of qualifying degree in first class would be available on or before 10 Aug 2016 may also apply.

Exam date:

Written Examination for DRDO Entry Test will be held in the month of July, 2016.


Q.1:- The resistance of a strip of copper of rectangular cross-section is 2Ω. A metal of resistivity twice that of copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be
(a) 6Ω (b) 4/3Ω (c) 3/2Ω (d) 3/4Ω
Q.2:- The electric field lines and equipotential lines
• Are parallel to each other.
• Are one and the same.
• Cut each other orthogonally.
• Can be inclined to each other at any angle.
Q.3:- For an SCR, di/dt protection is achieved through the use of
• R in series with SCR.
• L in series with SCR.
• RL in series with SCR.
• RLC in series with SCR.
Q.4:- In a linear system, an input of 5 sin wt produces an output of 10 cos wt. The output corresponding to input 10 cos wt will be equal to
(a) + 5 sin wt (b) - 5 sin wt (c) + 20 sin wt (d) – 20 sin wt.
Q.6:- A single instruction to clear the lower four bits of the accumulator I 8085 assembly language is:
(a) XRI OHF (b) ANI FOH (c) XRI FOH (d) ANI OFH.
Q.7:- The p-type substrates in a conventional pn-junction isolated integrated circuit should be connected to:
• Nowhere, i.e., left floating.
• A dc ground potential.
• The most positive potential available in the circuit.
• The most negative potential available in the circuit.
Q.8:- The velocity of electromagnetic ratio waves is
• 3 x
• 3 x
• 3 x
• 3 x
Q.9:- A certain 8- bit microprocessor executes “SUB A, B” by loading B to the ALU, then loading A to the ALU, Subtracting A from B, and storing the result in B. Which of the following instructions would cause the ZERO flag to be set?
• SUB – (X), (X) +
• SUB )X), (X) +
• SUB – ( X), (X)
• all of the above
Q.10:- which of the following induction motor will have the least shaft diameter?
• 20 HP, 2880 rpm
• 20 HP, 1440 rpm
• 20 HP, 960 rpm
• 20 HP, 730 rpm
Q.11:- In ‘plasma’ state a gas
• ( a) loses electrical conductivity
• ( b) attracts moisture
• ( c) becomes perfect dielectric medium
• ( d) conducts electricity


Q.13:- A 6 pole 3-phase wound-rotor induction machine is driven by another machine at 1800 rpm. The rotor of the induction machine is connected to a 50Hz system. If the mechanical rotation of the rotor is in the same direction as the rotor winding flux rotation, then frequency of the stator voltage will be
(a) 50Hz (b) 140 Hz (c) 150 Hz (d) 200 Hz
Q.14:- A universal motor runs at
• Higher speed will dc supply and with less sparking.
• Higher speed with ac supply with less sparking.
• Same speed both ac and dc supplies.
• Higher speed with ac supply but with increased sparking at the brushes.
Q.15:- Two 550 kVA alternator operate in parallel to supply the following loads
• 250 KW at 0.95 p.f. lagging
• 100 KW at 0.85 p.f. leading
One machine is supplying 200 KW at 0.9 p.f. lagging. The p.f. of other machine must be
(a) 0.89 leading (b) 0.95 leading (c) 0.95 lagging (d) 0.89 lagging

Q.16:- In a 110 volts compound generator, the armature, shunt and series windings are 0.06 ohm, 27.5 ohm and 0.04 ohm respectively. The load consists of 200 lamps; each rated at 55 W, 110 V. find the total e.m.f. when the machine is connected for long shunt operation.
(a) 12 V (b) 72 V (c) 100 V (d) 120 V
Q.17:- 1 Bagasse is
• Low quality coal.
• A fuel consisting of wood.
• Fibrous portion of sugarcane left after extracting the juice.
• A kind of rice straw.
Q.18:- The copper armature winding of a motor is subjected to an operating temperature of 80°C. The room temperature is 20° C. The percentage change in resistance of the armature winding from cold staring condition to normal running will be nearly:
(a) 10% (b) 16% (c) 20% (d) 24%
Q.19:- Magnetic flux density at a point distance R due to an infinitely long linear conductor carrying a current is given by
(a) B = (b) B =
(c) B = (d) B =
Q.20:- A zener diode works on the principle of
• Tunneling of charge carriers across the junction.
• Thermionic emission.
• Diffusion of charge carriers across the junction.


Please find the below attached file for the DRDO SET Electrical Engineering paper:



Electrical engineering syllabus:

Electronics and Communication Engineering:

Networks
Electronic Devices
Analog Circuits
Digital Circuits
Signals and Systems
Control Systems
Communications
Electromagnetic

Electrical Engineering:

Electric Circuits and Fields
Signals and Systems
Electrical Machines
Power Systems
Control Systems
Electrical and Electronic Measurements
Analog and Digital Electronics
Power Electronics and Drives

Attached Files

DRDO SET Electrical Engineering paper.doc (120.5 KB, 68 views)