kerala psc technical question papers with Answers
In this post i will be sharing Questions and Answers from Junior Instructor Instrument Mechanic exam conducted by kerala psc. The exam was conducted on year 2019 (Exact date of exam 28/11/2019) with Question paper code 65/2019.
This was a technical exam for diploma holders. The medium of Question was English and the post was in Industrial Training department.
I hope this will be useful for Upcoming technical exams for diploma jobs. If you want to download this Previous year Question paper as pdf Links are given at the end
1. Angle plate is made at an angle of __________
(A) 30° (B) 45°
(C) 90° (D) 60°
2. Vernier calipers are __________ instruments
(A) accurate (B) semi- precision
(C) non-precision (D) precision
3. In an open circuit __________
(A) Resistance is zero and current is infinity
(B) Resistance is infinity and current is zero
(C) Resistance and current are zero
(D) Resistance and current are infinity
4. Soft soldering is generally done __________
(A) At 1200°C (B) Above 450°C
(C) Between 800°C and 1050°C (D) Below 450°C
5. The reciprocal of resistivity is called
(A) permeability (B) conductance
(C) permittance (D) conductivity
6. Capacitance of a capacitor can be measured by using __________
(A) AC Bridge (B) Analog multimeter
(C) Kelvin Bridge (D) Wheatstone Bridge
7. The unit of luminous intensity is
(A) Lux (B) Lumex
(C) Tesla (D) Candela
8. Which of the following meters is an integrating type instrument?
(A) Watt meter (B) Ammeter
(C) Energy meter (D) Voltmeter
9. Permanent magnet moving coil instruments can be used for the measurement of
(A) AC only (B) DC only
(C) Both AC and DC (D) None of these
10. Load cells are used for the measurement of _________
(A) flow (B) velocity
(C) weight (D) displacement
11. The commonly used gas in Class III filled system is
(A) Oxygen (B) Helium
(C) Nitrogen (D) Hydrogen
12. 5.5 kg/cm2 = __________ Psi
(A) 78.27 (B) 80.85
(C) 76.02 (D) 75.45
13. The property of liquid’s resistance to flow
(A) Compressibility (B) Surface tension
(C) Velocity (D) Viscosity
14. The dimensionless quantity used to identify the type of flow
(A) Beta ratio (B) Reynold’s number
(C) Dielectric constant (D) Coefficient of discharge
15. The angle of inclination of the inclined manometer is of the order of
(A) 15° (B) 20°
(C) 10° (D) 25°
16. Torr is the unit for the measurement of
(A) Level (B) Speed
(C) Pressure (D) Specific gravity
17. The agreement with true value is called
(A) Sensitivity (B) Accuracy
(C) Precision (D) Span
18. Example of derived unit
(A) metre (B) second
(C) velocity (D) None of these
19. The speed at which an instrument responds to changes in input variable is called
(A) Fidelity (B) Lag
(C) Speed of response (D) Sensitivity
20. Example of primary sensor of differential head flow meter
(A) orifice plate (B) bellows
(C) manometer (D) rotameter
21. Modified form of venturi tube is
(A) pitot tube (B) rotameter
(C) dall tube (D) weirs and notches
22. Density of a fluid decreases with increase in
(A) Pressure (B) Temperature
(C) Flow (D) Level
23. Dead weight tester works on the principle of
(A) Conservation of energy (B) Bernoulli’s theorem
(C) Pascal’s law (D) Hooke’s law
24. __________ is used for the measurement of differential pressure
(A) Pitot tube (B) Pirani gauge
(C) Manometer (D) Barometer
25. Non-contact method of level measurement is
(A) sight glass (B) dall tube
(C) ultrasonic type (D) Piezoelectric type
26. Basic principle of LVDT is
(A) magnetic effect (B) mutual induction
(C) induced emf (D) Hysteresis effect
27. The nominal voltage of a fully charged lead acid cell is
(A) 1.1 V (B) 1.5 V
(C) 3.0 V (D) 2.2 V
28. Extension of ammeter range is obtained by connecting
(A) Low resistance in series (B) High resistance in parallel
(C) Low resistance in parallel (D) High resistance in series
29. PMMC type instruments can be used for measuring in
(A) AC circuits only (B) DC circuits only
(C) Both AC and DC circuits (D) Neither AC nor DC circuit
30. The form factor of half wave is
(A) 1 (B) 1.57
(C) 1.11 (D) 2
31. For stabilizing the gain of an amplifier
(A) Positive feedback is used (B) No feedback is used
(C) Input voltage is varied (D) Negative feedback is used
32. 8085 microprocessor has how many pins?
(A) 30 (B) 41
(C) 39 (D) 40
33. SCR is a __________ switch
(A) Unidirectional (B) Bidirectional
(C) Three directional (D) None of these
34. Which semiconductor power device out of the following is not a current triggered device?
(A) Thyristor (B) Triac
(C) GTO (D) MOSFET
35. Modem is used for
(A) Printing (B) Video editing
(C) Data display (D) Dial-up connection
36. A microprocessor performs the functions of CPU of a _________
(A) Control bus (B) Digital computer
(C) Memory (D) Data bus
37. Zener diode is used as
(A) Amplifier (B) Switch
(C) Regulator (D) None of these
38. Which of the following is not an advantage of negative feedback?
(A) Reduced noise (B) Increased gain
(C) Reduced distortion (D) Increased sound quality
39. The oscillator which generates sine wave oscillations is called
(A) Feedback oscillator (B) Harmonic oscillator
(C) Damped wave oscillator (D) Relaxation oscillator
40. The input resistance of an Op–Amp is about
(A) 2 kΩ (B) 20 mΩ
(C) 2 mΩ (D) 200 kΩ
41. The most heavily doped region in a transistor is
(A) Collector (B) Emitter
(C) Base (D) Both (A) and (C)
42. Which of these is a volatile memory?
(A) RAM (B) ROM
(C) PROM (D) EPROM
43. The decimal equivalent of the hexadecimal number AOH is
(A) 100 (B) 256
(C) 80 (D) 160
44. The gates required to build a half adder are
(A) EX-OR and NAND gate (B) EX-OR and AND gate
(C) EX-OR and NOR gate (D) Four NAND gates
45. __________ and __________ gates are called universal gates
(A) AND, OR (B) NOT, OR
(C) NAND, NOR (D) NAND, AND
46. The length of program counter (PC) of 8085 microprocessor is _________
(A) 6 Bits (B) 12 Bits
(C) 8 Bits (D) 16 Bits
47. When the source voltage increases in a zener regulator, the __________ current
remains constant approximately
(A) Series (B) Load
(C) Zener (D) Total
48. The instrument which is not suitable for the application in automatic control scheme
(A) Pitot static tube (B) Rotameter
(C) Orifice plate (D) Rotary piston meter
49. Absolute zero on Kelvin scale is equal to
(A) 273 K (B) 373 K
(C) 0 K (D) None of these
50. Temperature of core of earth is equal to 3727°C. This temperature in Kelvins is equal to
(A) 4000 K (B) 3727 K
(C) 3454 K (D) None of these
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51. Dip sticks are used for the
(A) Flow measurement (B) Pressure measurement
(C) Displacement measurement (D) Level measurement
52. IPTS stands for
(A) Indian Primary Temperature Scale
(B) International Primary Temperature Scale
(C) International Practical Temperature Scale
(D) International Practical Temperature Standard
53. Output of a Bimetallic element will be
(A) Voltage (B) Displacement
(C) Strain (D) Pressure
54. Which device is similar to an RTD but has a negative temperature coefficient?
(A) Thermistor (B) Negative-type RTD
(C) Thermocouple (D) Strain gauge
55. The ionization gauge is an instrument used for the measurement of
(A) Very high pressure (B) Medium pressure
(C) Very low pressure (D) High pressure
56. A capacitive pressure sensor has a typical measurement uncertainty of
(A) ± 0.4% (B) ± 0.2%
(C) ± 0.1% (D) ± 0.8%
57. The RS Flip-flop has __________ input/s
(A) One (B) Three
(C) Four (D) Two
58. The current gain is highest in _______ amplifiers.
(A) Common collectors (B) Common emitters
(C) Common base (D) All of these
59. In Boolean algebra, A + (A.B) = ________
(A) A.B (B) B
(C) A (D) 1
60. The DIAC is used as a triggering device for
(A) FET (B) TRIAC
(C) SCR (D) UJT
61. To avoid the creeping error in the energy meters, the discs must
(A) Be Laminated (B) Be thin
(C) Have bar magnet (D) Have holes
62. Output of an I to P converter is _______ kg/cm2
(A) 0 to 1 (B) 1.5 to 7
(C) 3 to 15 (D) 0.2 to 1
63. Potentiometer is a/an _______ instrument
(A) Recording (B) Indicating
(C) Comparison (D) Calibrating
64. A transistor is _______ operated device
(A) Voltage (B) Current
(C) Both voltage and current (D) None of the above
65. Reynolds number for turbulent flow is
(A) Less than 1000 (B) More than 4000
(C) Less than 2000 (D) Between 1000 and 2000
66. Well-type manometer is _______ accurate than u-tube manometer
(A) More (B) Less
(C) Equal (D) None of these
67. For flow measurement of highly corrosive and errosive fluid _______ is used
(A) Ventury meter (B) Rotameter
(C) Elbow tap (D) Magnetic flow meter
68. _______ is the final control element in most process control systems
(A) Transmitter (B) Amplifier
(C) Controller (D) Control valve
69. The 2’s complement of the number 1101101 is
(A) 0101110 (B) 0110010
(C) 0010011 (D) 0111110
70. If proportional band is more, controller response will be
(A) More (B) Less
(C) Medium (D) None of the above
71. PLC is used for _______ application
(A) control (B) flow
(C) level (D) counting
72. SCADA stands for
(A) Statutory control for acquisition of Data Analog
(B) Supervisory control and Data acquisition
(C) Standard counting of Analog to digital application
(D) Supervisory control on Analog to digital analysis
73. Thermo couples are arranged in ________ to form a thermopile.
(A) Parallel (B) Series
(C) Inclined (D) None of the above
74. Overshoot oscillation will be reduced by _______ action
(A) Integral (B) Derivative
(C) Proportional (D) None of the above
75. The range of PH of acidic solution is
(A) 14 (B) between 0 and 7
(C) 16 (D) between 7 and 14
76. Viscosity of air _______ with increase of temperature
(A) Increases (B) Decreases
(C) No change (D) None of the above
77. In closed loop control system, the input has control over
(A) Output (B) Feedback
(C) Set point (D) Open Loop
78. The most popular medium for the data highway is
(A) Modem (B) Internet
(C) Web (D) Ethernet
79. A Hydraulic controller has _______ power gain
(A) Low (B) Medium
(C) High (D) None of the above
80. 2-wire smart DP transmitter output follows _______ protocol
(A) ASCII (B) RS485
(C) HART (D) RS232
81. Relay is a/an
(A) ordinary switch (B) passive switch
(C) electro magnetic switch (D) All of these
82. With increase in the intensity of light, the resistance of a photo voltaic cell
(A) remains same (B) decreases
(C) increases (D) none of these
83. The unit of measurement of pressure is
(A) Kg m–3 (B) m2
(C) ms–2 (D) Nm–2
84. Temperature range of Thermistor is
(A) 60°C to – 15°C (B) – 60°C to 15°C
(C) 60°C to 15°C (D) – 60°C to 20°C
85. The BJT is a __________ controlled device
(A) Voltage (B) Current
(C) Temperature (D) None of these
86. The accuracy of a pneumatic controller is about
(A) ± 2% (B) ± 1%
(C) ± 4% (D) ± 5%
87. Any externally introduced signal affecting the controlled output is called
(A) Feedback (B) Stimulus
(C) Signal (D) Gain control
88. As a result of introduction of negative feedback which of the following will not decrease?
(A) Overall gain (B) Distortion
(C) Bandwidth (D) Instability
89. The bulbs of filled system thermometers are usually made of
(A) Copper (B) Glass
(C) Plastic (D) Stainless steel
90. Strip chart recorder is a
(A) Oscillographic recorder (B) Graphic recorder
(C) Magnetic type tape recorder (D) None of these
91. Venturi tubes are generally made of
(A) Phosphor bronze (B) Cast Iron
(C) Nickel (D) All of these
92. Set point of a system is also called
(A) Disturbance (B) Desired value
(C) Controlled variable (D) Manipulated variable
93. Ratio control system is a special type of
(A) Open-Loop system (B) Feedback system
(C) ON-OFF system (D) Feed forward system
94. A thermo couple gauge is one type of
(A) McLeod gauge (B) Ionization gauge
(C) Thermal conductivity gauge (D) None of these
95. Which of the following cannot be used for negative pressure?
(A) Piezo meter (B) Pirani gauge
(C) Bourdon tube gauge (D) U-tube manometer
96. A vibrating level sensor consists of
(A) One piezo electric oscillator (B) Two piezo electric oscillators
(C) Three piezo electric oscillators (D) Four piezo electric oscillators
97. The Gates required to build a half-adder are
(A) EX-OR and NAND gate (B) Four NOR gates
(C) EX-OR and AND gate (D) Four NAND gates
98. Which of the following instruments is a rate meter?
(A) Current meter (B) Venturi meter
(C) Hot wire anemometer (D) None of the above
99. A flow meter that measures flow rates which are independent of density is
(A) Orifice meter (B) Rotameter
(C) Magnetic flow meter (D) Venturi meter
100. A SCADA system will only monitor and never make changes to the operations
(A) True (B) False
(C) Cannot say (D) None of these
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