SAIL electrical engineering previous year papers

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SAIL electrical engineering previous year papers
Q.1.Two 100-W, 200-V lamps are connected in series across a 200-V supply. The total power consumed by each lamp will be _____ watts.

200
100
50
25

Q.2.The material used for fuse must have

low melting point and low specific resistance
high melting point and low specific resistance
low melting point and high specific resistance
none of these

Q.3.The purpose of introducing reactor in the ignition circuit of mercury are rectifier is to limit the

voltage of the circuit
rate of change of flux in the circuit
current in the circuit
rate of change of current in the circuit

Q.4.Sparking occurs when a load is switched off because the circuit has high

a resistance
inductance
capacitance
none of these

Q.5.The usual value of the surge impedance of a telephone line is ______ohm.

75
600
500
250

Q.6.In the case of a lossy capacitor, series equivalent resistance value will be

small
large
very small
none of these

Q.7.Time constant of an R-C circuit increases if the value of resistance is

decreased
increased
neither (a) nor (b)
either (a) or (b)

Q.8.Sparking between contacts can be reduced by inserting a

capacitor in parallel with contacts
resistance in the line
capacitor in series with contacts
none of these

Q.9.dBm is a

ratio of power
unit of power
unit of voltage
none of these

Q.10.Decibel is a unit of

frequency
impedance
power ratio
none of these

Q.11.The absolute unit of resistance is of the dimension of

velocity
length
acceleration
none of these

Q.12.The absolute unit of inductance is of the dimension of

time
length
mass
none of these

Q.13.The applied voltage from the circuit being checked is disconnected when an ohmmeter is used because

the current will decrease the resistance
the ohmmeter has its own battery
no current is needed for meter movements
none of these

Q.14.An accurate voltmeter must have an internal impedance of

very high value
very low value
low value
none of these

Q.15.A moving –coil instrument can be used to measure

high frequency a.c.
low frequency a.c
both d.c. and a.c
direct current

Q.16.The voltage drop across the moving coil of a 50-µ A (f.s) PMMC meter at full- scale deflection is ---- the voltage drop across that of a 1-mA (fs) PMMC meter at full-scale deflection.

less than
approximately equal to
greater than
none of these

Q.17.Voltage stress is maximum in a cable at the surface of the

insulator
sheath
conductor
none of these

Q.18.The coefficient of coupling between two air core coils depends on

mutual inductance and self inductances of the two coils
mutual inductance between two coils only
self inductances of the two coils only
none of these

Q.19.The location of lightning arrestor is

away from the transformer
near the transformer
near the circuit breaker
none of these

Q.20.A conductor of length 1 meter moves at rt. angles to a magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced e.m.f. in the conductor will be ----- volt.

75
25
50
100

Q.21.In electrical machines, laminated cores are used with a view to reducing

eddy current loss

hysteresis loss


Q.22.A battery

always delivers power
always absorbs power
absorbs power when the internal resistance is non-zero but delivers power when the internal resistance is zero
can absorb or deliver power depending upon the circuit to which it is connected

Q.23.Decibel is a

unit of voltage
unit of power
ratio of power
none of these

Q.24.Deflection of pointer of a permanent-magnet moving-coil meter for fixed current is _______ flux density in the airgap between magnetic pole shoes and coil.

independent of
directly proportional to
inversely proportional to
none of these

Q.25.A moving-iron meter is useful for voltage measurement at _______frequencies.

high
low
very high
none of these

Q.26.A thermocouple instruments would be used to measure alternating current only?

low
very low
high
none of these

Q.27.Which of the following instruments will be used to measure alternating current only?

moving – iron (attraction-types) ammeter
moving – iron voltmeter
permanent-magnet type ammeter
induction-type ammeter

Q.28.A milliammeter can be used

only as an ammeter
as a voltmeter
both as voltmeter and ammeter
none of these

Q.29.To measure the e.m.f. of a Weston standard cell, one would use a/an

electrostatic voltmeter
hot-wire voltmeter
galvanometer
potentiometer–Answer

Q.30.Deflection sensitivity of deflecting plates of cathode ray tube ____ the distance between deflection pates.

is inversely proportional to
is directly proportional to
does not depend on
none of these

Q.31.Deflection sensitivity of deflecting plates of a cathode ray tube ___the accelerating anode (A3) voltage.

is inversely proportional to
is directly proportional to
does not depend on
none of these

Q.32.A moving – coil instrument can be used to measure

direct current
alternating current
both direct current and alternating current
none of these

Q.33.The frequency stability of a crystal oscillator depends upon

tuned circuit
crystal
crystal as well as the tuned circuit
none of these

Q.34.Hay bridge is usually used for measuring

resistance
capacitance
inductance
none of these

Q.35.Schering bridge is used for measuring

capacitance
inductance
frequency
none of these

Q.36.The Wien’s bridge is particularly useful for measuring frequencies of _______value.

low
very high
high
very low

Q.37.Impedance relay is used to protect

line within a particular zone
line beyond a particular zone
the whole transmission system
none of these

Q.38.Buchholz relay is used in ______ protection.

line
generator
transformer
none of these

Q.39.Kirchhoff’s voltage law is not valid for a non-linear network.

True
False

Q.40.If a piece of metal wire is stretched, its resistance will increase.

True
False

Q.41.In mesh analysis of a network, all the mesh currents must necessarily be either clock-wise or anticlock-wise.

True
False

Q.42.An uncharged capacitor is connected across a charged one.There will flow an impulsive current through the circuit.

True
False

Q.43.If R, L and C denote resistance, inductance and capacitance respectively, the quantity RC has the same dimensions as that of R/L.

True
False

Q.44.If R, L and C denote resistance, inductance and capacitance respectively, then the quantity CR2 has the dimensions, of L.

True
False

Q.45.A battery will not cause any current to flow, when it is connected across a pure capacitor, in the steady state even if the capacitor value varies with time.

True
False

Q.46.When two capacitors C1 and C2 are connected in series, the effective capacitance is C1+C2

True
False

Q.47.The flux linked with a coil of inductance l carrying a current i is ddt(Li).

True
False

Q.48.When one wants to connect two batteries in parallel to draw larger current than what can be supplied by one battery, it suffices to ensure that their e.m.f.s. are equal.

True
False

Q.49.An ideal battery can supply infinite current

True
False

Q.50.1 GHz means 100 Hz.

True
False


SAIL electrical engineering previous year papers
Q.1.Two coils in differential connection have self-inductance of 2 mH and 4 mH and a mutual inductance of 0.15 mH. The equivalent inductance of the combination is

5.7 mH
5.85 mH
6 mH
6.15 mH.

Q.2.In a 8085 microprocessor system with memory mapped I / 0,

I / 0 devices have 8-bit addresses
I / 0 devices are accessed using IN and OUT instructions
there can be a maximum of 256 input devices and 256 output devices.
arithmetic and logic operations can be directly performed with the I / 0 data.

Q.3.When 2-port networks are connected in parallel, which parameters convenient to use

inverse hybrid
open circuit impedance
short circuit admittance
transmission

Q.4.The number of comparators needed in a 4-bit flash type ADC is

32
8
14
15

Q.5.Line imperfection in a crystal is called

Schottky defect
Frenkel defect
edge dislocation
Miller defect.

Q.6.The frequency modulated (FM) radio frequency range is nearly

250 - 300 MHz
150 - 200 MHz
90 - 105 MHz
30 - 70 MHz

Q.7.A 10 MHz square wave clocks a 5-bit ripple counter. The frequency of third flip-flop’s output would be

2
1
2.5
1.25

Q.8.Which of the following regulator provides output voltage polarity reversal without a transformer

Buck regulator
Boost regulator
Buck-boost regulator
Cuk regulator

Q.9.The polarization required in ground wave propagation is

Horizontal (linear)
vertical (linear)
Circular
Elliptical

Q.10.If the noise figure of a receiver is 1.6, its equivalent noise temperature is

464.00 K
174.00 K
108.75 K
181.25 K

Q.11.The minimum value of the life of a transistor to be used in three section R-C phase shift oscillator is

54.4
44
29
32

Q.12.Multicavity Klystron

is not a microwave device
is not a good low level amplifier because of noise
is not suitable to pulse operation
has a high repeller voltage to insure small transit time

Q.13.The value of M in the end will be
Do 100 I = 1, 2
DO 200 J = 1, 2
M = M + I + J
200 CONTINUE
100 CONTINUE
STOP
END

10
11
12
14

Q.14.In TV system, vertical pulses are separated out from horizontal pulses by the use of

integrator
differentiator
sweep credit
sync separator

Q.15.Fourier’s series expansion of an odd periodic function contains

sine terms only
cosine terms only
Both A and B
None of the above

16. The following programme is run on an 8085 microprocessor,
Memory address in Hex Instruction
2000 LXI SP, 1000
2003 PUSH H
2004 PUSH D
2005 CALL 2050
2008 POP 2050
2009 HIT
As the completion of execution of the program, the program the program counter of the 8085 contains ………, and the stack pointer contains ……..

2050, OFFC
2251, OFFC
1025, OCCF
1025, OCCF

Q.17.200 MHz may be classified as

VHF
SHF
UHF
EHF

Q.18.The principles of homogeneity and super-position are applied to :

linear time variant systems
non-linear time variant systems
linear time invariant systems
non-linear time invariant systems.

Q.19.Dislocations in materials are

point defect
line defect
planer defect
surface defects.

Q.20.The binary representation of 5.375 is

111.1011
101.1101
101.011
111.001

Q.21.Which one out of the following instruments should be used to measure 600 kV a.c. voltages?

Hot wire instrument
Electrostatic voltmeter
Moving coil voltmeter
Moving iron voltmeter.

Q.22.For a LC parallel circuit at resonance, all the statements given below are correct except

the line current is maximum at resonance
the branch currents at resonance are equal
the admittance is minimum at resonance
the angle between the branch current is 180oC at resonance.

Q.23.The Taylor series expansion of the function F(x) = x/(1+x), around x=0 is

x+x2+x3+x4+…….
x+x2+x3+x4+…….
2x+42+8x3+16x4+…….
x-x2+x3-x4+…….

Q.24.The mobility of electron in copper is :Given atomic weight = 63.54, density = 8.96 gm/cc, resistivity = 1.7×10–6 W-cm, Avogadro’s number = 6.025 ×1023

30 cm2/V-5
43.28 cm2/V-5
50 cm2/V-5
data not sufficient

Q.25.If a square wave voltage having 5V average value is applied to a low pass filter, then average value of output is

10 V
2.5 V
5 V
0 V

Q.26.Resistivity of electrical conductors is most affected by

temperature
pressure
Composition
all of the above.

Q.27.In CCIR B-system of TV, blanking pulse is placed during

equalizing pulse
retrace interval between each line
retrace period of vertical line
none of the above.

Q.28.The capacity of a channel is

number of digits used in coding
volume of information it can take
maximum rate of information transmission
bandwidth required for information

Q.29.Sometimes microwave signals follow the earth’s curvature. This due to

Ionospheric reflection
Faraday rotation
Ducting
Ionospheric scatter.

Q.30.The function of diplexers bridge in a TV transmitter is

to prevent the loading of several transmitters by video transmitter
to increase the bandwidth
to increase the power output
to increase the efficiency of transmission.






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