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11th December 2014, 03:55 PM
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Join Date: Apr 2013
Re: APTRANSCO exam Eligibility

APTRANSCO is The Andhra Pradesh Transmission Corporation Limited; it announces the recruitment for the post of the Sub Engineers every year through the written exam and interview

Eligibility:
Must have BE/B.Tech/ A.M.I.E, Electrical & Electronics Engineering or equivalent in the same discipline from recognized University

Age limit:
Age should be below 34 years

Age relaxation is provided
5 years for SC/ST candidates
10 years for physically challenged candidates

Tentative dates
Start date of online application: December 2014
Last date for receipt of online application: Mid of January 2015
Date of Written examination: Last week of January 2015

Selection Modes:

Selection will be on the basis of written exam and interview respectively

APTRANSCO exam Question Paper
1
For the scalar field u =
x2
2
+
y2
3
, magnitude of the gradient at the point (1,3) is
Options
A)
 13/9
B)
 9/2
C)
 5
D)
9
2
Correct
Answer C
2 A digital-to-analog converter with a full-scale output voltage of 3.5 V has a
resolution close to 14m V. Its bit size is
Options
A) 4 B) 8
C) 16 D) 32
Correct
Answer B
3
A single-phase half-controlled rectifier is driving a separately excited dc
motor. The dc motor has a back emf constant of 0.5 V/rpm. The armature
current is 5 A without any ripple. The armature resistance is 2. The converter
is working from a 280 V, single phase ac source with a firing angle of 80°.
Under this operating condition, the speed of the motor will be
Options
A) 339 rpm B) 359 rpm
C) 366 rpm D) 386 rpm
Correct C
Answer
4 In relation to the synchronous machines, which one of the following
statements is false?
Options
A) In salient pole machines, the
direct-axis synchronous reactance is
greater than the quadrature-axis
synchronous reactance
B) The damper bars help the
synchronous motor self start
C) Short circuit ratio is the ratio of the
field current required to produce the
rated voltage on open circuit to the
rated armature current
D) The V-curve of a synchronous
motor represents the variation in the
armature current with field excitation,
at a given output power
Correct
Answer C
5
The 8085 assembly language instruction that stores the content of H and L
registers into the memory locations 2050H and 2051H, respectively, is
Options
A) SPHL 2050H B) SPHL2051H
C) SHLD 2050H D) STAX 2050H
Correct
Answer C
6
If
E
is the electric field intensity,  x
E
) is equal to
Options
B) | A)
E E
|
C) null vector D) zero
Correct D


Answer
7 For the function f(x) = x2 e-x, the maximum occurs when x is equal to
Options
A) 2 B) 1
C) 0 D) -1
Correct
Answer B
8
Two wattmeters, which are connected to measure the total power on a three -
phase system supplying a balanced load, read 10.5 kW and - 2.5 kW,
respectively. The total powere and the power factor, respectively, are
Options
A) 13.0 kW, 0.334 B) 13.0 kW, 0.684
C) 8.0 kW, 0.52 D) 8.0 kW, 0.334
Correct
Answer D
9 The insulation strength of an EHV transmission line is mainly governed by
Options
A) load power factor B) switching over-voltages
C) harmonics D) corona
Correct
Answer B
10
For the equation,
s3 - 4s2+ s + 6 = 0
the number of roots in the left half of s-plane will be
Options
A) zero B) one
C) two D) three
Correct
Answer C
11 A dc potentiometer is designed to measure up to about 2 V with a slide wire of


800 mm. A standard cell of emf 1.18 V obtains balance at 600 mm. A test cell
is seen to obtain balance at 680 mm. The emf of the test cell is
Options
A) 1.00V B) 1.34V
C) 1.50V D) 1.70V
Correct
Answer B
12 High Voltage DC (HVDC) transmission is mainly used for
Options
A) bulk power transmission over
very long distances
B) inter-connecting two systems with
the same nominal frequency
C) eliminating reactive power
requirement in the operation
D) minimizing harmonics at the
converter stations
Correct
Answer A
13
A bipolar junction transistor (BJT) is used as a power control switch by
biasing it in the cut-off region (OFF state) or in the saturation region (ON
state). In the ON state, for the BJT
Options
A) both the base-emitter and basecollector
junctions are reverse biased
B) the base-emitter junction is reverse
biased, and the base-collector junction
is forward biased
C)
the base-emitter junction is forward
biased, and the base-collector
junction is reverse biased
D) both the base-emitter and basecollector
junctions are forward biased
Correct
Answer D
14 The Q - meter works on the principle of
Options A) mutual inductance B) self inductance


C) series resonance D) parallel resonance
Correct
Answer C
15
A 800 kV transmission line is having per phase line inductance of 1.1 mH/km
and per phase line capacitance of 11.68 nF/km. Ignoring the length of the line,
its ideal power transfer capability in MW is
Options
A) 1204 MW B) 1504 MW
C) 2085 MW D) 2606 MW
Correct
Answer C
16
If the following program is executed in a icroprocessor, the number of
instruction cycles it will take from START to HALT is
START MVI A, 14H ; Move 14H to register A
SHIFT RLC ; Rotate left without carry
JNZ SHIFT ; Jump on non-zero to SHIFT
HALT
Options
A) 4 B) 8
C) 13 D) 16
Correct
Answer C
17
A moving iron ammeter produces a full scale torque of 240 Nm with a
deflection of 120° at a current of 10 A. The rate of change of self inductance
(H/radian) of the instrument at full scale is
Options
A) 2.0 H/radian B) 4.8 H/radian
C) 12.0 H/radian D) 114.6 H/radian
Correct
Answer B


18
At an industrial sub-station with a 4 MW load, a capacitor of 2 MVAR is
installed to maintain the load power factor at 0.97 lagging. If the capacitor
goes out of serivce, the load power factor becomes
Options
A) 0.85 B) 1.00
C) 0.80 lag D) 0.90 lag
Correct
Answer C
19 The conduction loss versus device current characteristic of a power MOSFET
is best approximated by
Options
A) a parabola
B) a straight line
C) a rectangular hyperbola
D) an exponentially decaying function
Correct
Answer A
If P and Q are two random events, then the following is TRUE
20
A) Independence of P and Q implies that
probability (P
B) Probability (P Q )
Probability (P) + Probability (Q)
Q ) = 0
Options
C) If P and Q are mutually exclusive,
then they must be independent
D) Probability (P Q )
Probability (P)
Correct
Answer D


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