61. RT1, RT2, RT3, and RT4 are unstrained gauge resistance. If the resistance change in each gauge is 0.3Ω. Choose the correct option?
1. RT1 and RT3 increase by 0.3Ω
2. RT1 and RT3 increase by 0.3Ω
3. RT2 and RT4 decrease by 0.3Ω
4. All of the above
62. Which factor is responsible for the gain of the op-amp to roll off after a certain frequency is reached?
A. Capacitive effect
B. Resistive effect
C. Inductor effect
D. None of the mentioned
63. What remedy can be followed to maintain the operating frequency in the op-amps?
A. Use LC circuit
B. Use resistor
C. Use capacitor
D. Use transistor
64. How does the physical characteristic of semiconductors account for the increase in the frequency of op-amps?
A. Transistor values
B. Junction capacitance
C. Dopant concentration
D. None of the mentioned
65. How are op-amp with three break frequencies are represented?
A. Using two capacitors
B. Using three capacitors
C. Using one capacitor
D. All of the mentioned
65. In what way does the internal construction of the op-amp contributes to the capacitive effect in op-amp?
A. Formation of junction capacitor
B. Due to internally connected capacitors
C. Formation of stray capacitor
D. None of the mentioned
66. The gain of the differential amplifier is -125. Assume the voltage applied to bridge circuit Vdc = +10v and the unstrained resistance of four elements of the strain gauge is 200Ω. When a certain weight is placed on the platform, the output voltage is Vo = 5v. Determine the change in resistance of each strain gauge for the analog weight scale. (Assuming the output is initially nulled.
A. 1Ω
B. 0.8Ω
C. 0.3Ω
D. 1.83Ω
67. Assume that the increase and decrease in the resistance of the strain gauge element are by the same number of △R. Determine the unbalanced voltage equation.
A. V = – Vdc×(△R/R)
B. V = – Vdc×(△R/R+△R)
C. V = Vdc×(△R/R)
D. V = – Vdc×[(△R+ R)/R].
68. Voltage to current converter is also called as
A. Current series positive feedback amplifier
B. Voltage series negative feedback amplifier
C. Current series negative feedback amplifier
D. Voltage series positive feedback amplifier
69. Given voltage to current converter with the floating load. Determine the output current?
A. 3mA
B. 6mA
C. 4mA
D. 2mA
70. Which of the following application uses voltage for the current converter?
A. Low voltage dc and ac voltmeter
B. Diode match finding
C. Light-emitting diode
D. All of the mentioned
71. The op-amp in low voltage DC voltmeter cannot be nullified due to
A. D’Arsonaval meter movement
B. Offset voltage compensating network
C. Selection of switch
D. Gain of amplifier
72. What is the maximum input voltage that has to be selected to calibrate a dc voltmeter with a full-scale voltage range of 1-13v?
A. ≤ ±14v
B. ≥ ±13v
C. ≤ ±15v
D. = ±14v
73. Higher input voltage can be measured in low voltage DC voltmeter using
A. Smaller resistance value
B. Higher resistance value
C. Random resistance value
D. All of the mentioned
74. In the diagram given below, determine the deflection of the ammeter with a full-scale deflection of 1mA when the switch is at X2kΩ. Consider resistance of the offset voltage compensating network to be 10Ω.
A. Full-scale deflection in the ammeter
B. Half scale deflection in the ammeter
C. Quarter scale deflection in the ammeter
D. No deflection occurs in the ammeter
75. How to modify a low voltage DC voltmeter to a low voltage ac voltmeter
A. Add a full-wave rectifier in the feedback loop
B. Add a half-wave rectifier in the feedback loop
B. Add a square wave rectifier in the feedback loop
B. Add a sine wave rectifier in the feedback loop
76. Determine the full-scale range for the input voltage if the resistance in series with meters is 1kΩ, 2kΩ, 47kΩ, and full-scale meter movement is 1mA in a low voltage AC voltmeter?
A. 1.0 to 7.48 Vrms
B. 1.1 to 7.48 Vrms
C. 1.2 to 7.48 Vrms
D. 1.3 to 7.48 Vrms
77. Determine the current through the diode, when the switch is in positions 1, 2& 3. Assuming op-amps initially nulled.
A. Io (LED. = 4.01mA; Io (Zener) = 4.01mA; Io (rectifier) = 8.33mA
B. Io (LED. = 25mA; Io (Zener) = 4.01mA; Io (rectifier) = 4.01mA
C. Io (LED. = 16.67mA; Io (Zener) = 16.66mA; Io (rectifier) = 4.01mA
D. Io (LED. = 8.33mA; Io (Zener) = 8.33mA; Io (rectifier) = 8.33mA
78. A diode match finder circuit has an input voltage of 2.6v and an output voltage is 5.78v. Calculate the voltage drop across diode 1N4735
A. 2.22v
B. 8.38v
C. 3.18v
D. 15.02v
79. Find the voltage drop across the zener diode in the zener diode tester from the given specifications: IZk = 1mA, VZ = 6.2v, input voltage = 1.2v, output voltage = 3.2v and resistance in series with meter = 150Ω.
A. 6.2mA
B. 8mA
C. 21.33mA
D. Cannot be determined
80. Which among the following is preferred to display devices in digital applications?
A. Matched Zener diode
B. Matched LEDs
C. Matched rectifier diode
D. All of the mentioned