| Post Name | VOCATIONAL TEACHER - MAINTENANCE AND REPAIRS OF RADIO AND TELEVISION |
|---|---|
| Department | KVHSE |
| Question Paper Code | 046/2016 |
| Date of Test | 5 April 2016 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The distribution of electrons in the conduction band is given by :
Answer
B. (density of quantum states) × (probability a state is occupied)
2
Temperature coefficient of diode at room temperature is |
|
Answer
Question Cancelled
3
When the reverse bias increases for a diode, the PN junction capacitance :
Answer
C. Decreases, exhibiting inverse square root relation
4
Consider an ideal intrinsic semiconductor in thermal equilibrium. No external forces or fields
are applied to this semiconductor. At temperatures above 0 K, the electron concentration in |
the conduction band is non-zero because : |
Answer
D. some electrons from the valence band will overcome the bandgap by gained
thermal energy .
5
A junction FET has the following parameters. IDSS = 20 mA, Pinch off voltage = 5 V. The gate source cut off voltage is:
Answer
A. −5 V
6
The capacitance in parallel with forward biased base emitter terminals of a transistor is
known as: |
Answer
C. Diffusion Capacitance
7
~ Due to Early effect, for a transistor :
Answer
D. Output resistance decreases
8
Ina MOSFET, the drain current slightly Increases as the drain source voltage increases, The
phenomenon is known as:
Answer
B. Channel length Modulation
9
A MOSFET has a channel length lym. What value of Vos will cause the electrons to reach
saturation velocity : |
Answer
C. c) 10V
10
In the devices given below, maximum switching speed is available with :
Answer
Question Cancelled
11
The voltage gain for a differential amplifier, with the following specification A = 100, Rᵢd = 100 kΩ, Rₒ = 100 Ω, Rₛ = 10 kΩ and Rₗ = 1,000 Ω:
Answer
B. 38.3 dB
12
The intrinsic voltage gain, mw, of the BJT is:
Answer
A. 8.°%
13
If ground is applied to the (+) terminal of an inverting op-amp, the (—) terminal will:
Sey
Answer
B. be virtual ground
14
Terminal current gain for the common emitter amplifier is :
Answer
B. ratio of current delivered to load to current supplied to base
15
Negative feedback in transistor amplifier has the advantage of :
Answer
A. Extended bandwidth
16
The feedback in an amplifier circuit reduces the gain to 50%. The feedback factor is ;
Answer
C. -3dB
17
For an LC tuned circuit, :
Answer
Question Cancelled
18
Fastest of all logic families :
Answer
A. Emitter coupled logic
19
AD 670isa:
Answer
A. Successive approximation ADC
20
Noise due to random emission of electrons associated with charge flowing across a potential
barrier is known as :
Answer
D. Shot Noise
21
A broadcast radio transmitter radiates 5 kW power when the modulation percentage is 60%.
The carrier power 18 :
Answer
C. c) 4.239 KW
22
The advantage of DSB over SSB full carrier AM is : |
Answer
B. More stable transmitter gives better reception
23
Double side band modulator is used to obtain :
Answer
A. Double side band suppressed carrier signal ;
24
VSB modulation is preferred in TV because :
Answer
Question Cancelled
25
Which of the following is the indirect way of FM veneration?
Answer
B. Armstrong modulator
26
An FM signal with a deviation ∂ is passed through a mixer and has its frequency reduced to half. The deviation in the output of the mixture is:
Answer
D. ∂
27
A 1000 kHz carrier is simultaneously modulated with 300 Miz, 800 Hz and 2 kHz audio sine
waves. Which of the following frequency is least likely to be present in the output?
Answer
Question Cancelled
28
In the spectrum of a FM wave -
Answer
C. The total number of side band depends upon modulation index
29
Amplitude limiting action is achieved in:
Answer
D. Ratio detector
046/2016 6 A
30
Representation of band pass signals
Which of the above applications is Hilbert transform used?
Answer
B. 1,2and3
31
Main disadvantage of PCM is:
Answer
A. It needs large bandwidth
32
In phase shift keying the input signal is
Answer
Question Cancelled
33
33 Rather than sending the absolute value of each sample, it is possible to achieve a smaller
transmission bit-rate by sending the difference between consecutive samples. This is known —
as :
Answer
B. delta modulation
34
The impulse response of a linear interpolator ia :
Answer
D. Triangular pulse
35
Compandor, in digital communication refers to:
Answer
C. Both
36
Slotted frequency hopping is :
Answer
Question Cancelled
37
Bit length of a pseudo noise code, having m stage shift register is :
Answer
C. c) 2" -1
38
The rate of change at the output of the modulator is -
Answer
B. Baud rate
39
What is false for a Frequency Hopping Spread spectrum?
Answer
B. It is affected by near far problem
40
The ratio of the bandwidth of spreaded signal to the bandwidth of the unspreaded signal is
termed as:
Answer
C. Processing gain
41
Ina broadcast superheterodyne receiver having no RF amplifier, the loaded Q of the antenna
coupling circuit is 100. If the intermediate frequency is 455 kHz. The rejection ratio at
25 MHz will be :
Answer
A. 1.116
42
Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is:
Answer
C. 4π²/5
43
Diffraction of electromagnetic waves :
Answer
D. will occur around the edge of a sharp obstacle
44
The filter which provides full luminance
frequency information :
Answer
B. Comb filter
45
4h. White dots and cross latch patterns are called :
Answer
A. Divergence patterns
46
Magnitude of the signal formed by Q and I represents :
Answer
D. Color Saturation
47
JPEG 2000 standard uses :
Answer
C. Wavelet transformation
48
The dispersion is caused by the shape and index profile of the fibre core is:
Answer
A. Waveguide dispersion
49
Numerical Aperture for a multimode fiber is in the range of :
Answer
Question Cancelled
50
Noise caused by reflections returning a portion of the optical signal back into the laser cavity
is termed as:
Answer
D. Intercavity noise
51
The I/O port that does not have a dual-purpose role is:
Answer
C. Port 1
52
After reset, SP register is initialized to address :
Answer
B. TH
53
Which of the following statement is incorrect with watchdog control register, when an
external RESET is applied :
Answer
A. Watchdog run bit is set to OFF
54
When 8051 Microcontroller is interfaced with RS 232:
Answer
C. Line converter is connected in between
55
Select the correct statement for 8051 hardware -
Answer
D. CPU 8 Bit, PC 16 Bit, DPTR 16 bit, PSW 8 Bit, SP 8 Bit
56
With the help of RISC Architecture, PIC16F887 Microcontroller has reduced instruction set.
Number of instructions that CPU can recogonize is :
Answer
B. 35
57
The ADCO804 has resolution,
Answer
C. 8 bit
58
An alternate function of port pin P3.0 (RXD) in the 8051 is -
Answer
A. serial port input
59
can monitor everything that goes in on-board CPU gives complete visibility into
the target code's operation.
Answer
C. In Cireuit Simulator
60
ARM Processor Cortex A8,processor mode IRQ refers to
Answer
A. General purpose interrupt handling
61
N point DFT of the sequence δ(n) is :
Answer
A. Σ(n=0 to N−1) δ(n)Wⁿᵏ = 1
62
If x(n) is having DFT X(K), then the DFT of x(N-n) is:
Answer
B. X(N-K)
63
21 tap linear-phase FIR filter operating at a 1 kHz rate has delay :
Answer
D. 10ms
64
Resampling is usually done:
Answer
D. To interface two systems which have different sampling rates
65
Scaling in a digital filter is needed to:
Answer
C. Both
66
The TMS320C6713 processor supports ——————— prioritized interrupts. :
Answer
C. 16
67
In TDM to FDM conversion, the operation needed are :
Answer
D. Interpolation and modulation
68
Foran FIR filter design, pass band lower frequency is :
Answer
A. Zero
69
Which is not a disadvantage of IIR filter?
'
Answer
D. They can’t achieve a given filtering characteristic using less memory
70
For 8051 Micro controller ORG is used to:
Answer
C. Define address
71
PWM switching is preferred in voltage source inverters for the purpose of :
Answer
C. All the above
72
For a given torque, increasing diverter-resistance of a dc series motor :
Answer
B. Decreases its speed, reducing armature current
73
Decreases its speed, reducing armature current
Answer
A. ac voltage regulator
74
A boost regulator has an input voltage of 5 V and average output voltage of 15 V. The duty cycle is:
Answer
A. 2/3
75
Stepper motors are mostly used for :
Answer
Question Cancelled
76
The most suitable device for high frequency inversion in SMPS is:
Answer
C. MOSFET
77
In a self-controlled synchronous motor fed from a variable frequency converter :
Answer
B. The frequency of stator decides the rotor speed
78
An ideal chopper operating at a frequency of 500 Hz supplies a load having a resistance of 3 Ω and an inductance of 9 mH from a 50 V battery. The mean value of load voltage for on/off ratio of 4/1 is:
Answer
D. 40 V
79
The most suitable solid state converter for controlling the speed of three- phase cage motor at
25 Hz is:
Answer
C. Voltage source inverter
80
A four quadrant chopper cannot be operated as :
Answer
B. Cycloconverter
81
Who started a magazine called “Sivayoga Vilasam"?
Answer
B. Vagbhatananda
82
The first annual seasion of the SNDP having been held at :
Answer
A. Aruvippuram
83
The headquarters of the Kerala Press Acadamy :
Answer
D. Kochi
84
Who was the first women High court Judge in all over India? |
Answer
D. Annachandi
85
Who was known as “Sarva Vidyadi Rajan”?
Answer
C. Chattampi Swamikal
86
The first person to get Dadasaheb Phalke Award from Kerala :
Answer
A. Adoor Gopala Krishnan
87
Which one of the following was not the work of Dr, A.P.J. Abdulkalam?
Answer
C. Images and insight
|
88
Malayali memorial was submitted to the maharaja of travancore on -
Answer
B. January 1, 1891
89
The present form of Kathakali was designed by :
Answer
C. Kottayam tampuran
90
Who called Ayyankali "Pulaya Raja"?
Answer
A. Gandhi
91
“Athmakathakku Oru Amukham” is the autobiography of :
Answer
C. Lalthambika Antharjanam
92
Name the aN state in India to install earth quake early warning system :
Answer
B. Uttarakhand
93
Vala samudaya Parishkarani sabha was started by :
Answer
C. K.P. Karuppan
94
Which state introduced compulsory voting in local Governments elections?
Answer
A. Gujarath
95
Uniform Civil Code was contained in which article :
Answer
D. Articel 44
96
Which programme aims to achieve slum free India?
Answer
D. Rajiv Awas Yogana
97
Which of the following is the famous novel of 8.EK. Pottekkadu?
Answer
A. Visha Kanyaka
98
y 98. The preamble to our constitution includes all except :
Answer
B. Adult franchise
99
Who was known as “Sarasa druda kavi kireeda mani"?
Answer
D. Kodungallur Kunhikkuttan Tampuran
100
India accepted the idea of Judicial Review from :
Answer
B. USA
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