The previous year question paper for the DRDO ITI fitter examination is as given below:

Q.1:- The resistance of a strip of copper of rectangular cross-section is 2Ω. A metal of resistively 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.5:- For the system shown in figure, with a damping ratio § of 0.7 and an undamped natural frequency wof 4 rad / sec, the values of K and are

K = 4, a = 0.35
K = 8, a = 0.455
K = 16, a = 0.225
K = 64, 0.9

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.12:- If the secondary winding of the ideal transformer shown in the figure below, has 40 turns, the number of turns in the primary winding for maximum power transfer to the 2 ohm resistor will be
IDEA TRANSFORMER
( a) 20 (b) 40 (c) 80 (d) 160

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