MECHANICAL ENGINEERING- INSTRUMENT MECHANIC
MECHANICAL ENGINEERING- INSTRUMENT MECHANIC MCQs
1. Angle plate is made at an angle of __________ (A) 30° (B) 45° (C) 90° (D) 60°
Ans: C
2. Vernier calipers are __________ instruments (A) accurate (B) semi- precision (C) non-precision (D) precision
Ans: D
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
Ans: B
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
Ans: D
5. The reciprocal of resistivity is called
(A) permeability (B) conductance (C) permittance (D) conductivity
Ans: D
6. Capacitance of a capacitor can be measured by using __________
(A) AC Bridge (B) Analog multimeter (C) Kelvin Bridge (D) Wheatstone Bridge
Ans: C
7. The unit of luminous intensity is (A) Lux (B) Lumex (C) Tesla (D) Candela
Ans: D
8. Which of the following meters is an integrating type instrument?
(A) Watt meter (B) Ammeter (C) Energy meter (D) Voltmeter
Ans: C
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
Ans: B
10. Load cells are used for the measurement of _________
(A) flow (B) velocity
(C) weight (D) displacement
Ans: C
11. The commonly used gas in Class III filled system is
(A) Oxygen (B) Helium
(C) Nitrogen (D) Hydrogen
Ans: C
12. 5.5 kg/cm2 = __________ Psi
(A) 78.27 (B) 80.85
(C) 76.02 (D) 75.45
Ans: B
13. The property of liquid's resistance to flow
(A) Compressibility (B) Surface tension
(C) Velocity (D) Viscosity
Ans: D
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
Ans: B
15. The angle of inclination of the inclined manometer is of the order of
(A) 15° (B) 20°
(C) 10° (D) 25°
Ans: C
16. Torr is the unit for the measurement of
(A) Level (B) Speed
(C) Pressure (D) Specific gravity
Ans: C
17. The agreement with true value is called
(A) Sensitivity (B) Accuracy
(C) Precision (D) Span
Ans: A
18. Example of derived unit
(A) metre (B) second
(C) velocity (D) None of these
Ans: C
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
Ans: C
20. Example of primary sensor of differential head flow meter
(A) orifice plate (B) bellows
(C) manometer (D) rotameter
Ans: C
21. Modified form of venturi tube is
(A) pitot tube (B) rotameter
(C) dall tube (D) weirs and notches
Ans: C
22. Density of a fluid decreases with increase in
(A) Pressure (B) Temperature
(C) Flow (D) Level
Ans: B
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
Ans: C
24. __________ is used for the measurement of differential pressure
(A) Pitot tube (B) Pirani gauge
(C) Manometer (D) Barometer
Ans: C
25. Non-contact method of level measurement is
(A) sight glass (B) dall tube
(C) ultrasonic type (D) Piezoelectric type
Ans: C
26. Basic principle of LVDT is
(A) magnetic effect (B) mutual induction
(C) induced emf (D) Hysteresis effect
Ans: B
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
Ans: D
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
Ans: C
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
Ans: B
30. The form factor of half wave is
(A) 1 (B) 1.57
(C) 1.11 (D) 2
Ans: C
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
Ans: D
32. 8085 microprocessor has how many pins?
(A) 30 (B) 41
(C) 39 (D) 40
Ans: D
33. SCR is a __________ switch (A) Unidirectional (B) Bidirectional (C) Three directional (D) None of these
Ans: A
34. Which semiconductor power device out of the following is not a current triggered device? (A) Thyristor (B) Triac (C) GTO (D) MOSFET
Ans: D
35. Modem is used for (A) Printing (B) Video editing (C) Data display (D) Dial-up connection
Ans: D
36. A microprocessor performs the functions of CPU of a _________ (A) Control bus (B) Digital computer (C) Memory (D) Data bus
Ans: B
37. Zener diode is used as (A) Amplifier (B) Switch (C) Regulator (D) None of these
Ans: C
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
Ans: B
39. The oscillator which generates sine wave oscillations is called (A) Feedback oscillator (B) Harmonic oscillator (C) Damped wave oscillator (D) Relaxation oscillator
Ans: A
40. The input resistance of an Op–Amp is about (A) 2 kΩ (B) 20 mΩ (C) 2 mΩ (D) 200 KΩ
Ans: B
41. The most heavily doped region in a transistor is (A) Collector (B) Emitter (C) Base (D) Both (A) and (C)
Ans: B
42. Which of these is a volatile memory? (A) RAM (B) ROM (C) PROM (D) EPROM
Ans: A
43. 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
Ans: C
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
Ans: B
45. __________ and __________ gates are called universal gates
(A) AND, OR (B) NOT, OR (C) NAND, NOR (D) NAND, AND
Ans: C
46. The length of program counter (PC) of 8085 microprocessor is _________
(A) 6 Bits (B) 12 Bits (C) 8 Bits (D) 16 Bits
Ans: D
47. When the source voltage increases in a zener regulator, the __________ current remains constant approximately
(A) Series (B) Load (C) Zener (D) Total
Ans: B
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
Ans: B
49. Absolute zero on Kelvin scale is equal to
(A) 273 K (B) 373 K
(C) 0 K (D) None of these
Ans: C
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
Ans: A
Ans: C
2. Vernier calipers are __________ instruments (A) accurate (B) semi- precision (C) non-precision (D) precision
Ans: D
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
Ans: B
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
Ans: D
5. The reciprocal of resistivity is called
(A) permeability (B) conductance (C) permittance (D) conductivity
Ans: D
6. Capacitance of a capacitor can be measured by using __________
(A) AC Bridge (B) Analog multimeter (C) Kelvin Bridge (D) Wheatstone Bridge
Ans: C
7. The unit of luminous intensity is (A) Lux (B) Lumex (C) Tesla (D) Candela
Ans: D
8. Which of the following meters is an integrating type instrument?
(A) Watt meter (B) Ammeter (C) Energy meter (D) Voltmeter
Ans: C
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
Ans: B
10. Load cells are used for the measurement of _________
(A) flow (B) velocity
(C) weight (D) displacement
Ans: C
11. The commonly used gas in Class III filled system is
(A) Oxygen (B) Helium
(C) Nitrogen (D) Hydrogen
Ans: C
12. 5.5 kg/cm2 = __________ Psi
(A) 78.27 (B) 80.85
(C) 76.02 (D) 75.45
Ans: B
13. The property of liquid's resistance to flow
(A) Compressibility (B) Surface tension
(C) Velocity (D) Viscosity
Ans: D
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
Ans: B
15. The angle of inclination of the inclined manometer is of the order of
(A) 15° (B) 20°
(C) 10° (D) 25°
Ans: C
16. Torr is the unit for the measurement of
(A) Level (B) Speed
(C) Pressure (D) Specific gravity
Ans: C
17. The agreement with true value is called
(A) Sensitivity (B) Accuracy
(C) Precision (D) Span
Ans: A
18. Example of derived unit
(A) metre (B) second
(C) velocity (D) None of these
Ans: C
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
Ans: C
20. Example of primary sensor of differential head flow meter
(A) orifice plate (B) bellows
(C) manometer (D) rotameter
Ans: C
21. Modified form of venturi tube is
(A) pitot tube (B) rotameter
(C) dall tube (D) weirs and notches
Ans: C
22. Density of a fluid decreases with increase in
(A) Pressure (B) Temperature
(C) Flow (D) Level
Ans: B
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
Ans: C
24. __________ is used for the measurement of differential pressure
(A) Pitot tube (B) Pirani gauge
(C) Manometer (D) Barometer
Ans: C
25. Non-contact method of level measurement is
(A) sight glass (B) dall tube
(C) ultrasonic type (D) Piezoelectric type
Ans: C
26. Basic principle of LVDT is
(A) magnetic effect (B) mutual induction
(C) induced emf (D) Hysteresis effect
Ans: B
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
Ans: D
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
Ans: C
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
Ans: B
30. The form factor of half wave is
(A) 1 (B) 1.57
(C) 1.11 (D) 2
Ans: C
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
Ans: D
32. 8085 microprocessor has how many pins?
(A) 30 (B) 41
(C) 39 (D) 40
Ans: D
33. SCR is a __________ switch (A) Unidirectional (B) Bidirectional (C) Three directional (D) None of these
Ans: A
34. Which semiconductor power device out of the following is not a current triggered device? (A) Thyristor (B) Triac (C) GTO (D) MOSFET
Ans: D
35. Modem is used for (A) Printing (B) Video editing (C) Data display (D) Dial-up connection
Ans: D
36. A microprocessor performs the functions of CPU of a _________ (A) Control bus (B) Digital computer (C) Memory (D) Data bus
Ans: B
37. Zener diode is used as (A) Amplifier (B) Switch (C) Regulator (D) None of these
Ans: C
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
Ans: B
39. The oscillator which generates sine wave oscillations is called (A) Feedback oscillator (B) Harmonic oscillator (C) Damped wave oscillator (D) Relaxation oscillator
Ans: A
40. The input resistance of an Op–Amp is about (A) 2 kΩ (B) 20 mΩ (C) 2 mΩ (D) 200 KΩ
Ans: B
41. The most heavily doped region in a transistor is (A) Collector (B) Emitter (C) Base (D) Both (A) and (C)
Ans: B
42. Which of these is a volatile memory? (A) RAM (B) ROM (C) PROM (D) EPROM
Ans: A
43. 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
Ans: C
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
Ans: B
45. __________ and __________ gates are called universal gates
(A) AND, OR (B) NOT, OR (C) NAND, NOR (D) NAND, AND
Ans: C
46. The length of program counter (PC) of 8085 microprocessor is _________
(A) 6 Bits (B) 12 Bits (C) 8 Bits (D) 16 Bits
Ans: D
47. When the source voltage increases in a zener regulator, the __________ current remains constant approximately
(A) Series (B) Load (C) Zener (D) Total
Ans: B
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
Ans: B
49. Absolute zero on Kelvin scale is equal to
(A) 273 K (B) 373 K
(C) 0 K (D) None of these
Ans: C
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
Ans: A
51. Dip sticks are used for the
(A) Flow measurement (B) Pressure measurement
(C) Displacement measurement (D) Level measurement
Ans: D
52. IPTS stands for
(A) Indian Primary Temperature Scale
(B) International Primary Temperature Scale
(C) International Practical Temperature Scale
(D) International Practical Temperature Standard
Ans: C
53. Output of a Bimetallic element will be
(A) Voltage (B) Displacement
(C) Strain (D) Pressure
Ans: B
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
Ans: A
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
Ans: C
56. A capacitive pressure sensor has a typical measurement uncertainty of (A) ± 0.4% (B) ± 0.2% (C) ± 0.1% (D) ± 0.8%
Ans: B
57. The RS Flip-flop has __________ input/s
(A) One (B) Three
(C) Four (D) Two
Ans: D
58. The current gain is highest in _______ amplifiers.
(A) Common collectors (B) Common emitters
(C) Common base (D) All of these
Ans: A
59. In Boolean algebra, A + (A.B) = ________
(A) A.B (B) B
(C) A (D) 1
Ans: C
60. The DIAC is used as a triggering device for
(A) FET (B) TRIAC
(C) SCR (D) UJT
Ans: B
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
Ans: D
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
Ans: D
63. 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
Ans: C
64. A transistor is _______ operated device
(A) Voltage (B) Current
(C) Both voltage and current (D) None of the above
Ans: B
65. Reynolds number for turbulent flow is
(A) Less than 1000 (B) More than 4000
(C) Less than 2000 (D) Between 1000 and 2000
Ans: B
66. Well-type manometer is _______ accurate than u-tube manometer
(A) More (B) Less
(C) Equal (D) None of these
Ans: A
67. For flow measurement of highly corrosive and errosive fluid _______ is used
(A) Ventury meter (B) Rotameter
(C) Elbow tap (D) Magnetic flow meter
Ans: D
68. _______ is the final control element in most process control systems
(A) Transmitter (B) Amplifier
(C) Controller (D) Control valve
Ans: D
69. The 2's complement of the number 1101101 is
(A) 0101110 (B) 0110010
(C) 0010011 (D) 0111110
Ans: C
70. If proportional band is more, controller response will be
(A) More (B) Less
(C) Medium (D) None of the above
Ans: B
71. PLC is used for _______ application
(A) control (B) flow
(C) level (D) counting
Ans: A
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
Ans: B
73. Thermo couples are arranged in ________ to form a thermopile.
(A) Parallel (B) Series
(C) Inclined (D) None of the above
Ans: B
74. Overshoot oscillation will be reduced by _______ action
(A) Integral (B) Derivative
(C) Proportional (D) None of the above
Ans: B
75. The range of pH of acidic solution is
(A) 14 (B) between 0 and 7
(C) 16 (D) between 7 and 14
Ans: B
76. Viscosity of air _______ with increase of temperature
(A) Increases (B) Decreases
(C) No change (D) None of the above
Ans: B
77. In closed loop control system, the input has control over
(A) Output (B) Feedback
(C) Set point (D) Open Loop
Ans: A
78. The most popular medium for the data highway is
(A) Modem (B) Internet
(C) Web (D) Ethernet
Ans: D
79. A Hydraulic controller has _______ power gain
(A) Low (B) Medium
(C) High (D) None of the above
Ans: C
80. 2-wire smart DP transmitter output follows _______ protocol
(A) ASCII (B) RS485
(C) HART (D) RS232
Ans: C
81. Relay is a/an
(A) ordinary switch (B) passive switch
(C) electro magnetic switch (D) All of these
Ans: C
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
Ans: B
83. A SCADA system will only monitor and never make changes to the operations
(A) True (B) False (C) Cannot say (D) None of these
Ans: B
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
Ans: A
85. The BJT is a __________ controlled device
(A) Voltage (B) Current
(C) Temperature (D) None of these
Ans: B
86. The accuracy of a pneumatic controller is about
(A) ±2% (B) ±1% (C) ±4% (D) ±5%
Ans: B
87. Any externally introduced signal affecting the controlled output is called
(A) Feedback (B) Stimulus (C) Signal (D) Gain control
Ans: B
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
Ans: C
89. The bulbs of filled system thermometers are usually made of (A) Copper (B) Glass (C) Plastic (D) Stainless steel
Ans: D
90. Strip chart recorder is a
(A) Oscillographic recorder (B) Graphic recorder (C) Magnetic type tape recorder (D) None of these
Ans: B
91. Venturi tubes are generally made of
(A) Phosphor bronze (B) Cast Iron (C) Nickel (D) All of these
Ans: B
92. Set point of a system is also called
(A) Disturbance (B) Desired value (C) Controlled variable (D) Manipulated variable
Ans: B
93. Ratio control system is a special type of
(A) Open-Loop system (B) Feedback system (C) ON-OFF system (D) Feed forward system
Ans: D
94. A thermo couple gauge is one type of
(A) McLeod gauge (B) Ionization gauge (C) Thermal conductivity gauge (D) None of these
Ans: C
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
Ans: C
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
Ans: B
(A) Flow measurement (B) Pressure measurement
(C) Displacement measurement (D) Level measurement
Ans: D
52. IPTS stands for
(A) Indian Primary Temperature Scale
(B) International Primary Temperature Scale
(C) International Practical Temperature Scale
(D) International Practical Temperature Standard
Ans: C
53. Output of a Bimetallic element will be
(A) Voltage (B) Displacement
(C) Strain (D) Pressure
Ans: B
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
Ans: A
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
Ans: C
56. A capacitive pressure sensor has a typical measurement uncertainty of (A) ± 0.4% (B) ± 0.2% (C) ± 0.1% (D) ± 0.8%
Ans: B
57. The RS Flip-flop has __________ input/s
(A) One (B) Three
(C) Four (D) Two
Ans: D
58. The current gain is highest in _______ amplifiers.
(A) Common collectors (B) Common emitters
(C) Common base (D) All of these
Ans: A
59. In Boolean algebra, A + (A.B) = ________
(A) A.B (B) B
(C) A (D) 1
Ans: C
60. The DIAC is used as a triggering device for
(A) FET (B) TRIAC
(C) SCR (D) UJT
Ans: B
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
Ans: D
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
Ans: D
63. 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
Ans: C
64. A transistor is _______ operated device
(A) Voltage (B) Current
(C) Both voltage and current (D) None of the above
Ans: B
65. Reynolds number for turbulent flow is
(A) Less than 1000 (B) More than 4000
(C) Less than 2000 (D) Between 1000 and 2000
Ans: B
66. Well-type manometer is _______ accurate than u-tube manometer
(A) More (B) Less
(C) Equal (D) None of these
Ans: A
67. For flow measurement of highly corrosive and errosive fluid _______ is used
(A) Ventury meter (B) Rotameter
(C) Elbow tap (D) Magnetic flow meter
Ans: D
68. _______ is the final control element in most process control systems
(A) Transmitter (B) Amplifier
(C) Controller (D) Control valve
Ans: D
69. The 2's complement of the number 1101101 is
(A) 0101110 (B) 0110010
(C) 0010011 (D) 0111110
Ans: C
70. If proportional band is more, controller response will be
(A) More (B) Less
(C) Medium (D) None of the above
Ans: B
71. PLC is used for _______ application
(A) control (B) flow
(C) level (D) counting
Ans: A
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
Ans: B
73. Thermo couples are arranged in ________ to form a thermopile.
(A) Parallel (B) Series
(C) Inclined (D) None of the above
Ans: B
74. Overshoot oscillation will be reduced by _______ action
(A) Integral (B) Derivative
(C) Proportional (D) None of the above
Ans: B
75. The range of pH of acidic solution is
(A) 14 (B) between 0 and 7
(C) 16 (D) between 7 and 14
Ans: B
76. Viscosity of air _______ with increase of temperature
(A) Increases (B) Decreases
(C) No change (D) None of the above
Ans: B
77. In closed loop control system, the input has control over
(A) Output (B) Feedback
(C) Set point (D) Open Loop
Ans: A
78. The most popular medium for the data highway is
(A) Modem (B) Internet
(C) Web (D) Ethernet
Ans: D
79. A Hydraulic controller has _______ power gain
(A) Low (B) Medium
(C) High (D) None of the above
Ans: C
80. 2-wire smart DP transmitter output follows _______ protocol
(A) ASCII (B) RS485
(C) HART (D) RS232
Ans: C
81. Relay is a/an
(A) ordinary switch (B) passive switch
(C) electro magnetic switch (D) All of these
Ans: C
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
Ans: B
83. A SCADA system will only monitor and never make changes to the operations
(A) True (B) False (C) Cannot say (D) None of these
Ans: B
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
Ans: A
85. The BJT is a __________ controlled device
(A) Voltage (B) Current
(C) Temperature (D) None of these
Ans: B
86. The accuracy of a pneumatic controller is about
(A) ±2% (B) ±1% (C) ±4% (D) ±5%
Ans: B
87. Any externally introduced signal affecting the controlled output is called
(A) Feedback (B) Stimulus (C) Signal (D) Gain control
Ans: B
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
Ans: C
89. The bulbs of filled system thermometers are usually made of (A) Copper (B) Glass (C) Plastic (D) Stainless steel
Ans: D
90. Strip chart recorder is a
(A) Oscillographic recorder (B) Graphic recorder (C) Magnetic type tape recorder (D) None of these
Ans: B
91. Venturi tubes are generally made of
(A) Phosphor bronze (B) Cast Iron (C) Nickel (D) All of these
Ans: B
92. Set point of a system is also called
(A) Disturbance (B) Desired value (C) Controlled variable (D) Manipulated variable
Ans: B
93. Ratio control system is a special type of
(A) Open-Loop system (B) Feedback system (C) ON-OFF system (D) Feed forward system
Ans: D
94. A thermo couple gauge is one type of
(A) McLeod gauge (B) Ionization gauge (C) Thermal conductivity gauge (D) None of these
Ans: C
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
Ans: C
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
Ans: B
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