| Post Name | INSTRUCTOR Gr.I(ELECT.Engg.) - TECH. EDUCATION (Engg. Colleges) |
|---|---|
| Question Paper Code | 059/2020 |
| Category Code | 079/2017 |
| Date of Test | 2 December 2020 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
If � ��� � , the value of 2x + 3y + 4z is
� 5 � z xy � �5 8 �
Answer
Question Cancelled
2
The solution set of x − 4y − z = 11, 2x − 5y + 2z = 39, −3x + 2y + z = 1 is
Answer
A. {– 1, – 5, 8}
3
The value of x for which the tangent to the curve y � will be parallel to the
(1 � x)2
x-axis
Answer
B. – 1
4
The coefficient of x–8 in the expansion of �� x � ��
2
� x�
Answer
C. C(20, 14)214
5
cos 11� � sin11� is
cos 11� � sin11�
Answer
D. tan 56°
6
The local maximum and local minimum values of 4sinx + cos2x are respectively
Answer
A. (3, – 5)
7
� dx is
1 � cos x
�x� �x� �x�
Answer
C. � x cot � � � c
8
The angle between the straight lines y � 3x � 5 � 0 and x � 3y � 6 � 0 is
�
Answer
B. �
9
The area bounded by the curve y = cos x, the x-axis and the lines x = 0 and x = 2π is:
Answer
D. 4
10
Solve 3eˣ tan y dx + (1 − eˣ) sec²y dy = 0.
Answer
A. tan y = (1 − eˣ)³c
11
The _____________ of cement is measured in terms of its specific surface which
can be determined by various methods out of which Blaine’s air permeability method
is quite frequently used.
Answer
B. Fineness
12
The modulus of elasticity of M25 concrete is
Answer
A. 25000 N/mm2
13
Gunter’s chain is _____________ long and consists of 100 links.
Answer
A. 66 foot
14
_____________ is the process of levelling in which the elevations of points are
computed from vertical angles and horizontal distances measured in the field, just
as the length of any side in any triangle can be computed.
Answer
C. Indirect levelling
15
If the independent footing of two columns are connected by a beam, it is called a
Answer
A. Strap footing
16
Heat addition at constant pressure occurs in
Answer
C. Diesel cycle
17
Maximum fuel economy is obtained with
Answer
B. Lean mixture
18
The size of exhaust valve of an engine in comparison to suction valve is
Answer
A. Less
19
Which one is boiler mounting ?
Answer
D. Fusible plug
20
The moderator used in nuclear power plant is
Answer
A. Graphite
21
If the current in a zero-resistance wire AB is increased, the voltage VAB across the
wire will
Answer
C. Remain constant
22
Cutting an air gap in a magnetic circuit result in
Answer
B. Increase in reluctance
23
In a parallel RC circuit
Answer
B. IC leads IR by 90
24
A 1000 W, 230 V electric kettle is connected in series with another similar kettle
and the combination is connected to 230 V supply. The total power drawn by the
combination will be
Answer
B. Less than 1000 W
25
The unit of the permittivity is
Answer
A. Farad/metre
26
The coil span of dc armature winding is made equal to pole switch in order to
Answer
Question Cancelled
27
Which of the following type of generators does not require equalizers for satisfactorily
for parallel operation ?
Answer
B. Under compounded
28
In a DC motor, unidirectional torque is produced with the help of
Answer
D. Both
29
The torque Vs armature current (Ia) graph for a DC series motor is
Answer
C. Parabola up to full load and straight lines at overloads
30
A 200 KVA transformer has an iron loss of 1 KW and full load copper loss of 2 KW.
The KVA corresponding to maximum efficiency is
Answer
B. 141.1 KVA
31
The all-day efficiency of the transformer depends on
Answer
D. Both
32
A 3 phase induction motor is running at a slip of 4% and input to the rotor is
2000 watts. The mechanical power developed in the rotor is
Answer
A. 1920 W
33
If the stator frequency and voltage of an induction motor are reduced proportionately,
then
Answer
Question Cancelled
34
In a squirrel-cage induction motor, starting torque with autotransformer starting is ______ times the torque with direct switching, K being the transformation ratio.
Answer
A. K²
35
The power factor of an alternator under short conditions is
Answer
B. Almost zero lagging
36
In a synchronous machine, the angle between the synchronously rotating stator flux
and rotor poles is called
Answer
B. Torque angle
37
A 100 V/20 V, 100 VA transformer is converted to 100 V/110 V auto transformer the
rating of the auto transformer is
Answer
Question Cancelled
38
If the mechanical load of a three-phase induction motor is increased from no load to
full load, the input power factor of the motor will
Answer
C. Increase
39
In which of the following region, induction motor operation is stable ?
Answer
A. Low slip region
40
Grading of cables is done to achieve
Answer
B. Uniform stress
41
What is the Address (SFR) for TCON, SCON, SBUF, PCON and PSW
respectively ?
Answer
A. 88H, 98H, 99H, 87H, 0D0H
42
A thyrite type lightning arrestor
Answer
C. Offers a low resistance path to the surge
43
Which of the following types of heating will be preferred for cooking food without
removing the outer shells ?
Answer
C. Dielectric heating
44
Damping used in moving iron instruments is
Answer
A. Air friction
45
An RLC series circuit remains predominantly inductive
Answer
C. Above resonant frequency
46
Steady state stability of a power system is enhanced by
Answer
B. Using double circuit lines
47
A hydel power plant of run off river type should be provided with a pondage so that
Answer
A. Firm capacity of the plant is increased
48
Which one is not a unconventional source of energy ?
Answer
C. Fossil fuel
49
The pin which provides reset option in 8051 micro-controller is
Answer
B. Pin 9
50
In sodium vapour lamp, neon gas
Answer
B. Assists in developing enough heat to vaporize the sodium
51
In a single-phase full wave rectifier, during blocking state the peak inverse voltage
of diode is Vm is the peak voltage.
Answer
Question Cancelled
52
In a single-phase full converter, if � and � are the firing angle and extinction angles
respectively, then the load current is
Answer
A. Discontinuous if (� – �) < �
53
A forward voltage can be applied to SCR after its
Answer
B. Gate recovery time
54
Synchronous motor is normally used for driving
Answer
B. Lathes
55
In moving iron instrument, the deflecting torque is proportional to
Answer
A. I2
56
Corona loss increases with
Answer
B. Increase in supply frequency but reduction in conductor size
57
If the excitation of a synchronous generator fails, it acts as a
Answer
Question Cancelled
58
The device that does not have the gate terminal is
Answer
D. Diac
59
A string insulator has 5 units. The voltage across the bottom most unit is 25% of the
total voltage. String efficiency is
Answer
C. 80%
60
Resistance switching is normally employed in the case of
Answer
C. Air blast circuit breaker
61
An ohmmeter is a
Answer
B. Moving coil instrument
62
In a single-phase power factor meter, the phase difference between the currents in
the two pressure coils is
Answer
C. Exactly 90°
63
In PLC Ladder logic programming consists of
Answer
C. Function blocks and connecting lines
64
The equipment or element which can reduce Ferranti effect
Answer
Question Cancelled
65
Transmission lines are transposed to
Answer
C. Prevent interference with neighbouring telephone lines
66
An isolated device used to protect a PLC from incoming surge from fields
Answer
A. Transformer
67
Which of the following represent active transducer ?
Answer
D. Thermocouple
68
Fusing factor is defined as the ratio between
Answer
C. Minimum fusing current and rated current
69
The illumination is directly proportional to the cosine of the angle made by the normal
to the illuminated surface with the direction of the incident flux.
Above statement is associated with
Answer
D. Lambert’s cosine law
70
Capacitors of optimal size are installed at suitable locations in a distribution
system for
1. Improved voltage regulation
2. Reduction in distribution power losses
3. Reduction of KVA rating of distribution transformers.
Answer
C. 1,2and3
71
The use of zener diode connected in a UJT circuit used for triggering an SCR is to
Answer
C. Supply constant voltage to UJT for correct firing
72
The input impedance of a CRO is
Answer
D. Around 1 Mega ohms
73
A mirror is provided behind the pointer in measuring instruments for
Answer
C. Reading errors due to inclined observation are eliminated by removing parallax
between the pointer and its image in the mirror
74
For proper earthing, the earth wire should not be of size smaller than
Answer
A. 10 SWG copper
75
The most economical DC distribution system is
Answer
Question Cancelled
76
Due to sag between two supports the conductor takes the form of
Answer
A. Catenary
77
In suspension type insulators, the string efficiency can be improved by
1. Grading of insulator discs
2. Reducing the cross-arm length
3. Using guard rings
4. Using a longer cross arm.
Answer
B. 1,3 and 4 are correct
78
Electric power for steam locomotive is provided through
Answer
C. Small turbo-generator
79
The vertical core type induction furnace requires supply at
Answer
A. Normal frequency
80
Pin type insulators are mainly used in
Answer
A. Distribution system
81
The 8051 uses which RAM locations for register R0-R7 on powering up ?
Answer
B. 00-07
82
The function of a filter in a rectifier is to
Answer
D. Reduce the ripple voltage in the output
83
The transistor amplifier stage has lowest input impedance in
Answer
A. CB Configuration
84
Barkhausen criteria for sustained oscillations gives
1
Answer
D. A �
�
85
Octal equivalent of decimal (51)10 is
Answer
A. 638
86
Which of the following statement is incorrect ?
Answer
Question Cancelled
87
Astable multivibrator may be used as
Answer
B. Voltage to frequency converter
88
Which of the following logic gate dissipates minimum power ?
Answer
C. MOS
89
The minimised expression for the given K-map is
AB 00 01 11 10
CD
00 1 1
01 1 x
11 1 1 x x
10 1 x x
Answer
D. CB � BC � CD
90
In a T flip-flop, ratio of frequency of the input pulse to the frequency of output
pulse is
1
Answer
C. 2
91
The 2’s complement of binary number 0.01011 is
Answer
A. 1.10101
92
Universal gates are
Answer
D. Both
93
In a BJT with ICO � 1�A, � � 0.99 , the value of ICEO is
Answer
D. 100 �A
94
What is the output voltage V0 of the circuit shown in figure ? The input voltages are
V1 = 2.5 V and V2 = 1V
Answer
C. – 4.5 V
95
In a full wave rectifier, the peak inverse voltage per diode is
Vm
Answer
Question Cancelled
96
What is CDMA ?
Answer
B. Code Division Multiple Access
97
Register that is used to hold the memory address of the next instruction to be
executed is
Answer
B. Program counter
98
A PWM switching scheme is used in single phase inverters to
Answer
D. Reduce low order harmonics and increase high order harmonics
99
In a transistor, � may be expressed in terms of � as below
� �
Answer
B. 1� � 1� �
1� � 1� �
100
Load impedance must match amplifier output impedance in order that
Answer
B. Maximum power is transferred to the load
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