| Post Name | VOCATIONAL TEACHER – MAINTENANCE AND REPAIRS OF DOMESTIC APPLIANCES |
|---|---|
| Department | KVHSE |
| Question Paper Code | 225/2015 |
| Date of Test | 8 December 2015 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Compute the kVA load for maximum efficiency of a 5500/220V, 50 kVA, 50 Hz transformer
with full load Cu losa 1.2 kW and a core loss of 1 KW:
Answer
A. 45.64 kVA
2
Ina transformer on no load the input voltage :
Answer
B. leads the magnetizing current by 90°
3
If the source voltage and frequency are doubled for a transformer, the eddy current loss in
the core will become :
Answer
D. 4 times
4
Ina level compounded generator, the terminal voltage at half full load is :
Answer
B. greater than no load voltage
5
A4 pole generator with 16 coils has a 2 layer lap winding. The pole pitch is :
Answer
B. 16
6
The back emf generated by a 220V de machine with armature resistance 0.5 ohm when
driven as a motor 210V. What is the generated emf if the machine is driven as a generator?
Answer
C. c) 2100
7
For ade shunt motor by flux control, we get speeds :
Answer
A. above normal speed only
8
Swin Burne's test is not suitable for :
Answer
B. series motor
9
Armature reaction of a synchronous generator at rated voltage zpf lag is :
Answer
C. Demagnetizing
10
The rotor of a 3 phase 4 pole induction motor rotates at 1000 rpm when 50 Hz supply is
connected across stator terminals. Calculate the frequency of rotor induced emf:
Answer
D. 16.67 Hz
11
Class AB operation is often used in power amplifiers in order to:
Answer
C. overcome cross over distortion
12
The MOSFET switch in its ON state may be considered equivalent to- |
Answer
D. capacitor |
13
A relaxation oscillator is one which :
Answer
B. produces non sinusoidal outputs
14
Ina single stage CB amplifier, a smaller load resistance will produce :
Answer
A. low voltage gain
15
A twisted ring counter consists of 6 flipflops, it will have :
Answer
B. 12 states
16
A memory in which the contents get erased, when power failure occurs :
Answer
A. RAM
17
Race around condition occurs in J-K Flip Flop when :
Answer
C. both inputs are one |
18
Ademultiplexer can be used to realize
Answer
D. combinational circuits
19
The logic swing of a gate is about 0.8V. This gate belongs to logic family :
Answer
B. ECL
20
Fora feedback control system of type 2, the steady state error for a ramp input is :
Answer
C. zero
21
In force current analogy, Capacitance is analogous to :
:
Answer
C. mass
22
Which of the following quantity is the same for mechanical translational system and
| mechanical rotational system?
|
Answer
D. viscous friction coefficient
23
The number of roots of s³ + 5s² + 7s + 3 = 0 in the right half of s-plane is:
Answer
A. zero
24
Regenerative feedback means the output is feedback with : | |
Answer
A. positive sign
25
An increase in damping factor ;
Answer
C. decreases peak time
26
A compensating network is added to:
Answer
B. alter the locus of the roots as a system parameter is varied
27
The characteristic equation of an armature controlled DC motor is of :
Answer
B. second order
28
The breakaway points of the root locus occurs at :
Answer
C. multiple roots of the characteristic equation
29
Ifthe damping factor of a system is 1, the system is:
Answer
C. critically damped
30
An energy meter whose constant is 700 revolutions / kWHr makes 5 revolutions in
15 seconds. Calculate the load in kW :
Answer
B. 1.71 kW
31
The ratio error of a current transformer is due to :
Answer
A. exciting current
32
Which method is most suitable for the measurement of resistance of an ammeter shunt?
Answer
B. Kelvin's double bridge
33
A
Answer
Question Cancelled
34
For a single phase induction type energy meter, to obtain true value reading, the shunt
magnet flux must lag the applied voltage by :
|
Answer
D. 90 degree
35
The hysteresis error in the instrument couses -
Answer
A. change in same reading when input is first increased and then decreased’
36
While measuring power in a 3 phase circuit by 2 wattmeter method, the wattmeter readings will be equal and opposite when:
Answer
D. load is purely capacitive
37
Thermocouples are :
Answer
A. active transducers
38
In spring controlled MI instruments. The scale is : |
Answer
B. cramped at lower end and scattered at the upper end |
39
The controlling torque in a meggar is provided by :
Answer
D. does not need any controlling torque arrangement
40
Swamping resistance is used to compensate the error due to:
Answer
A. temperature
41
Multiple trace can be accomplished in a CRO with :
Answer
C. Dual beam CRT
42
In an electronic ohm meter, the OP-AMP is used as
Answer
D. buffer amplifier
43
In order to reduce the loading effect of the circuit under test, the input impedance of an
electronic meter should be :
Answer
B. high
44
Electronic volt meters are more accurate for high resistance circuits as compared to ordinary
voltmeter because of its :
Answer
B. high ohm/volt rating
_
45
Ifthe duty cycle of a pulse waveform clamped around zero is 0.5. What is its crest factor?
Answer
B. 1.118
46
A digital power factor meter converts pf into frequency and is counted. If the peak stepped
down voltage is 2V, CT ratio 1:40 and rectifier gain is 1. What would be the frequency for
0.85 pf?
Answer
A. 21.65 Hz
47
The voltage sensitivity of a multi meter is 20mV. Its internal resistance is 40 ohm. Then its
current sensitivity is :
Answer
C. 500 micro ampere
48
A digital phase meter with ZCD is fed with 2 sinusoidal voltages of the same amplitude and
frequency but with a phase displacement. If the time delay with them is 0.15 msec and their
; time periods are 1.5 msec, what is the measured phase difference :
Answer
A. 36°.36'
49
A differential amplifier inputs are 5 mV and 3 mV. The output is 300 mV. What is the
amplifier gain :
Answer
C. 150
50
If the bandwidth of an oscilloscope is 12 MHz, what is the fastest rise time a sine wave can have in order to be accurately reproduced by the instrument?
Answer
D. 29 msec
51
2 identical coils of 200 turns each, lie in a parallel plane and produced a flux of 400 mWb. Ifa
current of 6 A flows through one coil, find the mutual inductance :
Answer
A. 10H
52
A coil of insulated wire of resistance 8 ohm and inductance 0.03 H are connected across 240 V
50 Hz supply. Calculate the active power drawn by the coil :
Answer
B. 3.01 kW |
|
53
Peak factor of a sinusoidal wave is: |
Answer
B. 1.414
54
The magnetic hysteresis is primarily due to:
Answer
C. retentivity
55
Load in each branch of a delta connected balanced 3 phase, 400 V, 50 Hz circuit consists of an
inductance of 31.8 mH series with a resistance of 10 ohm. Calculate total power consumed by
the ckt :
Answer
C. 24.01 kW
56
A 20 kV is applied across a capacitor with capacitance is 0.0004 micro farad. The capacitor is
formed by 2 parallel metal plates each of area 200 cm? and separated by a dielectric 4 mm
thick. Find the electric flux density :
Answer
A. 4x10* Chm?
57
225/2015 10 : A
If the inductance of a series circuit is increased, its resonance frequency :
Answer
B. decreases
58
In a balanced delta connected 3 phase system, line currents lags the phase currents by :
Answer
B. 30°
59
If there are n nodes in a circuit, then the number of equations needed to solve the network using nodal analysis is:
Answer
C. n − 1
60
If the length of a given conductor is doubled and it's cross section is halved, its resistance
becomes -
Answer
D. 4 times
61
A 60 MW power station has an annual peak load of 50 MW. The annual load factor is 0.45.
Find the average load :
Answer
D. 22.5 MW
62
f
Absorption of neutrons in a nuclear reactor is done by ;
Answer
D. Coolant
63
In a hydroelectric power plant, sudden rise of pressure in the penstock pipe is managed with :
Answer
B. turbine
64
The tariff that takes into account of the power factor of the consumer is :
Answer
A. Sliding scale tariff
65
An over excited synchronous motor running on no load is called :
Answer
A. Synchronous generator
66
High load factor :
Answer
B. Reduces cost per unit generated
67
The major disadvantage of solar power generation :
Answer
B. corrosion
68
Calculate the reactive power, if the circuit draws a current of 1.5 kA at a voltage 20 EV with a |
power factor 0.8 :
|
Answer
C. 18kVA
69
The zero sequence component always flow through :
;
Answer
D. any of the above
70
Most suitable method earthing of a delta connected generator is : |
Answer
B. pipe earthing |
71
The insulation resistance is measured by :
Answer
C. Kelvin's bridge
72
° Acceptable limit of earth resistance for domestic installations :
Answer
D. _ less than 15 ohm
A 11 2256/2015
73
Acceptable limit of earth resistance for domestic installations:
Answer
A. less than 10 ohm
74
In Incandescent lamps, coiled coil filaments are used for :
Answer
C. low wattage lamps
75
The choke of a fluorescent lamp is healthy, when the series connected test lamp with choke :
Answer
C. glows dim
76
The volume of conductor required for transmitting a fixed amount of power is :
Answer
A. inversely proportional to V2
77
LT cables are used for voltages below :
Answer
B. 1kV
78
78 When wood is used as insulator, it will come under which class of insulators?
Answer
A. ¥ {
79
Insulatora employed for locations where there is a change in direction of the line:
Answer
D. strain type
80
The frequency of flickers in a fluorescent lamp at 220 V 50 Hz supply will be: |
Answer
C. 100 Hz
81
Who was the founder of the Basel Mission in Malabar?
Answer
D. Rev. Gundert
82
Who was hailed as the father of political movement in Malabar?
Answer
Question Cancelled
83
The Social organization Travancore Muslim Mahajana Sabha was founded by :
Answer
D. Vakkam Abdul Khadir Moulavi
84
The political organization formed as a part of the Abstention Movement in Kerala :
Answer
A. Joint Political Conference :
85
The founder of the Atma Vidya Sangam was:
Answer
D. Swami Vagbhatananda
86
Who was the first person to write the biography of Karl Marx in Malayalam?
|
Answer
C. Ramakrishna pilla
87
The Book Bilathiyile Viseshangal was written by :
Answer
D. K.P, Kesava Menon
88
The first Travelogue in Malayalam : ,
Answer
B. Varthamana Pusthakam
89
The British official who conducted a special enquiry in to the cause of Mappila riots :
Answer
C. T.L. Strange
90
The Malayalam scholar who is hailed as the father of Modern Malayalam Prose :
Answer
C. Kerala Varma Valiya Koyi Thampuran
91
The first Indian women to preside over the UN General assembly :
Answer
A. Vijayalakshmi Pandit
92
Who has been appointed as the first vice chairman of NIT] AYOG?
Answer
A. Aravind Panagariya
93
The only rice museum of the world is situating at :
Answer
C. Manila
94
Who is the only woman appointed as the Chief Election Commissioner of India?
Answer
A. V.S. Rema Devi
95
The mid Day Meal scheme covered under the ministry of :
Answer
B. Human Resource Development -
96
Feroz Gandhi award is given for outstanding performance in the field of :
Answer
A. Journalism
97
The only Indian women to win an Olympic medal is :
Answer
C. Karnam Malleswari
98
The Manav Adhikar Bhavan at New Delhi is the Head Quarters of the National :
Answer
B. Human Rights Commission
99
Who won the Gandhi Peace Prize for the year 20137
Answer
A. Chandi Prasad Bhatt
100
Psephology is-the study of : ; |
Answer
B. Election
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