| Post Name | LECTURER IN ELECTRICAL AND ELECTRONICS ENGINEERING - TECHNICAL EDUCATION |
|---|---|
| Question Paper Code | 131/2023 |
| Category Code | 306/2022 |
| Date of Test | 26 July 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The matrix οͺ οΊ is symmetric, if the value of b is :
ο«3 5ο»
Answer
A. 3
2
If minor of 2 in οͺ3 0 4 οΊ is β5, then the value of b is :
οͺο«5 1 b οΊο»
Answer
A. 5
3
Coefficient of x 3 in ο§ x + ο· is :
ο¨ xοΈ
Answer
A. 5
4
sin 30Β° cos 15Β° + cos 30Β° sin 15Β° equals:
Answer
A. 1/β2
5
If y = 2x and x = ay are perpendicular, then a equals:
Answer
C. β2
6
sin 2x
Answer
B. +c
2
sin 2x cos 2x
7
Solution of βx dy + βy dx = 0 is:
Answer
A. βx + βy = c
8
Derivative of sin β1 (sin x ) is :
Answer
A. 1
9
Slope of the normal to x = 2tΒ², y = 2t at t = 1 is:
Answer
C. β2
10
Which of the following is true?
Answer
A. Every differentiable function is continuous
11
Workability of fresh concrete is measured by :
Answer
D. Slump test
12
Increase in volume of a given mass of sand due to the presence of moisture in it is termed as :
Answer
B. Bulking
13
Portion of a brick obtained by cutting a brick length-wise into two portions is termed as :
Answer
B. Queen closer
14
An offset is laid out at 30Β° from its true direction on the field. Find the resulting
displacement of the plotted point on the paper in a direction parallel to the chain line given
that the length of the offset is 25 m and the scale is 10 m to 1 cm:
Answer
A. 1.250 cm
15
The consecutive readings taken at points A, B, C, D with a dumpy level at a single station are
5.21, 3.92, 4.12, 7.42. Reduce level at point A is 100 m. reduce level of the point D is :
Answer
C. 97.79 m
16
What is the purpose of a spark plug in a four-stroke internal combustion engine?
Answer
B. To ignite the fuel-air mixture
17
How does a diesel engine differ from a gasoline engine in terms of combustion process?
Answer
B. Diesel engines do not use spark plugs
18
Which of the following is NOT a type of internal combustion engine?
Answer
D. Steam engine
19
What is the function of the carburetor in a gasoline engine?
Answer
C. To mix the fuel with air for combustion
20
Which of the following is the most common fuel used in thermal power plants?
Answer
B. Coal
21
A series circuit consists of a coil of a resistance 2 Ξ© and inductance 64 mH and capacitance of
40 ΞΌ F. The Q-factor of the circuit at resonance is :
Answer
A. 20 Ξ©
22
A coil consists of a resistance of 100 Ξ© and an inductance of 200 mH. If an alternating
voltage v, given by v = 200 sin 500t volts is applied across the coil, the current through the
coil is :
Answer
C. 1A
23
Two wattmeters are connected to measure the input power to a balanced three-phase. If the
instrument readings are 8 kW and 4 kW, the load power factor is :
Answer
B. 0.866
24
A d.c source having an open-circuit voltage of 24 V and an internal resistance of 1.2 Ξ© is
connected to a load of resistance RL. The maximum power dissipated by the load is :
Answer
D. 120 W
25
Norton equivalent circuit for the network shown in fig. consists of βββββ current source
with parallel resistance of βββββ.
2
Answer
A. 9.5A, Ξ©
26
A point at which two or more elements have a common connection is called :
Answer
C. node
27
For a low pass filter, the attenuation is zero throughout the frequency range for which the
characteristic impedance is :
Answer
B. Purely resistive
28
A balanced three-phase star-connected load has I_R = 5β 0Β°, I_Y = 5β β120Β°, I_B = 5β 120Β°. The zero-sequence current is:
Answer
C. 0 A
29
The flux density between two plates separated by mica of relative permittivity 5 is
8.85 ΞΌ C/m2 voltage gradient between the plates is :
Answer
A. 200 kV/ m
30
A straight conductor of 1 m carrying a current of 30 A lies perpendicular to a uniform
magnetic field of flux density 0.8 T. The magnitude of force experienced by the conductor is :
Answer
B. 24 N
31
A 1 MHz plane wave propagates in fresh water. Losses are negligible, ΞΌ_r = 1 and Ξ΅β²_r = 81. The velocity of propagation is:
Answer
Question Cancelled
32
The direction of the Poynting vector indicates the direction of the instantaneous βββββ
at a point.
Answer
A. Power flow
33
A capacitor uses a dielectric 0.04 mm thick and operates at 30 V. The electric field strength
across the dielectric at this voltage is :
Answer
D. 750 KV/m
A 7 131/2023
34
A ceramic capacitor has an effective plate area of 4 cm2 separated by 0.1 mm of ceramic of
relative permittivity 100. The capacitance of the capacitor is :
Answer
A. 3540 pF
35
A 10 V battery is connected across a load having a resistance of 20 Ξ© . The energy dissipated
in 2 minutes is :
Answer
D. 600 J
36
Value of voltage V shown in fig is :
Answer
B. 50 V
37
An e.m.f. of 2kV is induced in a coil when a current of 2 A collapses uniformly to zero in 4ms.
The inductance of the coil is :
Answer
C. 4H
38
A series RC circuit takes 250 watts at a power factor of 0.5 from a 100 V, 50 Hz supply. The
impedance of the circuit is :
Answer
B. 20 Ξ©
39
For the circuit shown in fig reading of the ammeter is :
11.5 A
Answer
C. 2.5 A
40
Emitter follower amplifier has :
Answer
B. High input resistance and low output resistance
41
The factors which affects the operating point stability are :
Answer
D. All the above factors
42
When the input to class C amplifier is a sine wave, the output current will flow?
Answer
C. Less than half cycle
43
The reduction in voltage gain in the low frequency region of an RC coupled amplifier is due to
the presence of :
Answer
A. Coupling capacitor
44
An amplifier has a voltage gain of 100. To reduce distortion 5% negative feedback is
employed. The gain of the amplifier with feedback is :
Answer
A. 16.67
45
An RC phase-shift oscillator employing a BJT has angular frequency of oscillation Ο (n = R_c/R):
Answer
D. [1/(RC)]Β·1/β(6+4n)
46
In the given differential-amplifier circuit, V_a = +4 V, V_b = +1 V, R_f = 1 kΞ© and Rβ = 10 kΞ©. V_o is:
Answer
Question Cancelled
47
An Op-Amp circuit which converts sine wave signal into square wave signal :
Answer
C. Schmitt trigger
48
FIR filters will have transfer function with :
Answer
B. Only zeroes
49
The time period of free running multivibrator output cycle of 555 astable multivibrator is :
Answer
C. 0.693*(Ra+2Rb)C1
50
A voltage regulator experiences a 10 ΞΌ V change in its output voltage when its input voltage
changes by 2V. What is the line regulation rating of the circuit :
Answer
C. 5 ΞΌ V/V
51
In 8051 microcontroller, what is the contents of register A after the execution of the following
code :
CLR A
ORL #99H
CPL A
Answer
A. 66H
52
A microprocessor with 12 address lines is capable of addressing :
Answer
D. 4096 locations
53
A single phase full wave mid point thyristor converter uses a 230/200V transformer with
centre tap on secondary side. The PIV per thyristor is :
Answer
D. 282.8 V
131/2023 10 A
54
Gain modulated field effect transistor is also known as :
Answer
C. IGBT
55
The typical quiescent power dissipation of low power CMOS units is :
Answer
A. 2nW
56
Find the sampling interval for sin(2Οt ) :
Answer
C. 0.5 sec
57
The ideal SNR of 8 bit ADC is :
Answer
A. 49.92 dB
58
In which memory the program data for the currently executing program will be stored :
Answer
D. Cache memory
59
A 200/400 V, 50Hz, two winding transformer is rated at 20 kVA. Its windings are connected
as an auto-transformer of rating 200/600V. The power rating of the autotransformer is :
Answer
C. 30 kVA
60
In a 200/100 V, 50 Hz transformer, 150V and 75Hz is applied to the primary side. Assuming
that the magnetic circuit will remain unsaturated, the flux density will change to :
Answer
C. 0.5 times
61
A 400/115 V delta/star transformer has 2 A third-harmonic current in all three secondary phases. What is the magnitude of third-harmonic line current on the primary side?
Answer
A. zero
62
The dc motor, which can provide zero speed regulation at full load without any controller is :
Answer
D. differential compound
63
The series field winding terminals of a differentially compounded dc generator are externally
shorted. Then the output terminal voltage will :
Answer
A. increase
64
A 220V dc motor produces 40 Nm torque at an armature current is 10 A. When the armature
current is 15 A, the developed torque will be
Answer
Question Cancelled
65
An alternator has 12 slots per pole and the first coil lies in slot 1 and 11. Then the pitch
factor for the winding is :
Answer
B. cos 15Β°
66
An alternator generates 400V, 50 Hz when excited with 5A field current. Assuming the
magnetic circuit is unsaturated, the generated voltage when operating at 40 Hz and 4A field
current is :
Answer
C. 256 V
67
A three phase, salient pole synchronous generator is connected to an infinite bus. It is
operated at half full load and under excited condition. Then the operation of the generator
will be at :
Answer
C. low leading power factor
68
Distributed winding and short chording employed in AC machines will result in :
Answer
D. reduction in both emf and harmonics
131/2023 12 A
69
A three-phase 415 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%.
The speed of stator magnetic field relative to the rotor magnetic field is :
Answer
A. Zero
70
The full load slip of an induction motor depends on :
Answer
B. Rotor copper loss
71
A three-phase cage induction motor is started by Direct-On-Line
Answer
B. 1.25
72
By design, what is the phase difference between the currents in the main winding and
auxiliary winding in a capacitor start single phase induction motor?
Answer
B. 90 degrees
73
A 150 MW power station delivers 150 MW for 2 hours, 100 MW for 7 hours and is shut down
for rest of the hours of each day. Calculate the annual load factor if the plant is shut down for
25 days for maintenance work in a year :
Answer
C. 27.78%
74
When Sag is increased on the OH lines?
Answer
D. Tension is decreased
75
A load of 15000 kW with load current 80A is delivered by a 3 phase transmission line having
conductors each of resistance 1 Ξ© /km. Calculate the distance over which load is delivered
with a transmission loss of 6% :
Answer
A. 46.88 km
76
Current chopping occurs in :
Answer
B. Air blast circuit breaker
77
The equal area criteria is used to obtain information about :
Answer
A. transient stability
78
The positive sequence and negative sequence voltages are equal in
Answer
D. double line to ground fault
79
Calculate the plug setting multiplier of a 6A over current relay having a current setting of
150%, connected to a supply circuit through 420/6A CT when the circuit carries a fault
current of 4200A :
Answer
A. 6.67
80
The voltage magnitude and voltage phase angle are specified in
Answer
C. Swing bus
81
Find the number of revolutions made by a single phase energy meter when used to measure
the energy consumption by a 230 V, 0.8 pf, 10A load for 2 hours if the energy meter constant
is 750?
Answer
Question Cancelled
82
Calculate the flux density of a moving coil voltmeter with 10 Ξ© resistance which gives full
scale deflection for 50mV. The coil has 4 cm length and 2 cm breadth and is wound for
75 turns. The controlling torque produced for full scale deflection is 55 Γ 10β6 N-m.
Answer
B. 0.183 Wb/m2
83
The output voltage of a piezo electric crystal is 240V when it is subjected to a pressure of
2 Γ 106 N/m2. Calculate its voltage sensitivity if the crystal has a thickness of 3mm.
Answer
C. 0.04
84
Which bridge is preferred for measuring the inductance of high Q coils?
Answer
B. Hayβs bridge
85
There are 4 horizontal and 3 vertical tangencies in a lissajous pattern on an oscilloscope. If
frequency of the horizontal input is 150 Hz, find the frequency of the vertical input :
Answer
D. 200 Hz
86
In real time sampling data acquisition system, the bandwidth is limited to :
fs fs
Answer
A. =
87
Identify the unity feedback system with transfer, whose characteristic equation has root
locus that exist for the entire portion of negative real axis in s-plane :
k ( s2 + 2s + 1) k ( s2 + 2s + 2)
Answer
D. s ( s2 + 2s + 2) ( s + 10 ) s ( s2 + 2s + 2)
88
Which transfer function has the bode gain plot as shown in figure below :
k ( s + 5) k ( s + 5) ( s + 10)
Answer
A. (s +
89
Identify the number of roots of sβ· + 6sβΆ + 11sβ΅ + 6sβ΄ + 4sΒ³ + 24sΒ² + 44s + 24 = 0 that lie on the imaginary axis.
Answer
A. 0
90
Determine the approximate gain margin for the system with open loop transfer function
10
s(s+1)?-
Answer
D. -20 dB
91
The behaviour of a unity feedback system with open loop transfer function .
s ( s β 1)2 ( s + 10)
Answer
A. Stable
92
Identify the kind of singular point at the origin of the system αΊβ = xβ, αΊβ = sin(xβ) β xβ.
Answer
C. Saddle point
93
Suggest which among the following frequency should be used to sample the signal y(t) = 10 sin(10t) + 2.5 sin(314t) + 3.76 cos(1000t).
Answer
D. 1000 Hz
94
The system xΜ = [[1, 1], [β6, β3]]x + [[1], [β2]]u, y = [1 0]x is:
Answer
A. Stable and completely state controllable
95
Compute the time required to settle the unit step response of the system with closed loop
1
transfer function 2
.
s + 4s + 8
Answer
B. 2s
96
Identify the natural frequency in the response of the system with closed loop transfer
16
function 2
.
s + 3s + 9
Answer
B. 3 rad/s
97
Determine the transfer function for the system shown below :
U ( s)
G1 β G1G3 H 2 + G2G3G4
Answer
A. 1 β G3 H 2 β G2G3G4 H1 β G1H1 + G1G3 H1H 2
G1 + G2G3G4
98
The Nyquist plot of a system, whose open loop transfer function has one pole and two zeros
lie to the right of the imaginary axis in s-plane, is shown below. The closed loop system is :
Answer
C. Unstable with two pole to the right of imaginary axis
99
Suggest a suitable controller / compensator for the system with open loop transfer function
10
to achieve a phase margin of 40Β° at 1 rad/s with a velocity error constant of
s ( s + 1)
atleast 10.
Answer
C. Lag
100
Identify whether the system exhibits a limit cycle. The nonlinearity is saturation with unity gain in the linear region and saturation at Β±1; the linear block is 2/[s(s+1)(s+2)].
Answer
D. No limit cycle exists
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