81. The maximum current through the load in all application that uses voltage to current converter with floating is
A. 100mA
B. 75mA
C. 25mA
D. 50mA
82. For voltage to current converter with grounded load, establish a relation between the non-inverting input terminals and load current
A. V1 = [Vin+Vo-(IL×R)] /2
B. V1 = [Vin-Vo-(IL×R)] /2
C. V1 = [Vin+Vo-IL+R] /2
D. V1 = [Vin+Vo+(IL×R)] /2
83. Find the gain of the voltage to the current converter with grounded load?
A. 2
B. 1
C. ∞
D. 0
84. Find the output voltage and the load current for the circuit given below. Assume that the op-amp is initially nulled V1 =2.5v
A. IL=0.42mA, Vo =10v
B. IL=0.42mA, Vo =3.4v
C. IL=0.42mA, Vo =6.1v
D. IL=0.42mA, Vo =5v
85. The output current equation for MC1408 digital to analog converter would be
A. Io= -(Vref/R1)×[(D7/2)+(D6/4)+(D5/8)+(D4/16)+(D3/32)+(D2/64)+(D1/128)+(D0/256)].
B. Io= (Vref/2R1)×[(D7/2)+(D6/4)+(D5/8)+(D4/16)+(D3/32)+(D2/64)+(D1/128)+(D0/256)].
C. Io= (Vref/R1)×[(D7/2)+(D6/4)+(D5/8)+(D4/16)+(D3/32)+(D2/64)+(D1/128)+(D0/256)].
D. Io= -(Vref/2R1)×[(D7/2)+(D6/4)+(D5/8)+(D4/16)+(D3/32)+(D2/64)+(D1/128)+(D0/256)].
86. Determine the maximum value of output current of the DAC in MC1408?
A. 0.773×(Vref/R1)
B. 0.448×(Vref/R1)
C. 0.996×(Vref/R1)
D. 0.224×(Vref/R1)
87. Determine the range or the output voltage?
A. 0 – 2.51v
B. 0 – 2.22v
C. 0 – 3.74v
D. 0 – 4.93v
88. Calculate the change in the output voltage if the photocell is exposed to a light of 0.61lux from a dark condition. Specification: Assume that the op-amp is initially nulled, Minimum dark resistance = 100kΩ, and resistance when illuminated (at 0.61lux) = 1.5kΩ.
A. Vo –> 23v to 50v
B. Vo –> 0v to 33.11v
C. Vo –> -1.653v to 8.987v
D. Vo –> -0.176v to -11.73v
89. Which cell can be used instead of a photocell to obtain an active transducer in photosensitive devices?
A. Photovoltaic cell
B. Photodiode
C. Photosensor
D. All of the mentioned
90. If the input applied to DAC using the current to voltage converter is 10110100, determine the reference voltage (Assume Io= 2mA and R1=1.2kΩ)
A. 53.1v
B. 3.41v
C. 9.21v
D. 67.34v
91. The current to voltage converter photosensitive device can be used as
A. Light intensity meter
B. Light radiating meter
C. Light deposition meter
D. None of the mentioned
92. For a full-wave rectification, in a low voltage ac voltmeter, the meter current can be expressed as
A. Io = (1.9×Vin)/R1
B. Io = (3.9×Vin)/R1
C. Io = (0.9×Vin)/R1
D. Io = (2.9×Vin)/R1
93. Which of the following circuit has the highest input resistance?
A. Voltage follower
B. Inverting amplifier
C. Differential amplifier
D. None of the mentioned
94. Find the bias current from the given circuit
A. 30mA
B. 3mA
C. 0.30mA
D. 0.03mA
95. How to choose an op-amp when working with high input source resistance?
A. Op-amp with low bias current
B. Op-amp with higher slew rate
C. Buffer or voltage follower
D. All of the mentioned
96. What must be done to block the ac input voltage riding on a dc level?
A. Use RC network
B. Use coupling capacitor
C. Use resistive transducer
D. None of the mentioned
97. To get higher input resistance in AC coupled voltage follower,
A. The output resistance is bootstrapped
B. The input resistance is bootstrapped
C. The bias resistance is bootstrapped
D. The feedback resistance is bootstrapped
98. Voltage follower circuits are used in
A. Active filter
B. All of the mentioned
C. Sample and hold circuit
D. Bridge circuit with transducer
99. Compute the reference voltage for a fundamental log-amp, if its internal resistance=5MΩ.
A. 0.5µv
B. 0.05µv
C. 5µv
D. None of the mentioned
100. Which of the following functions does the antilog computation required to perform continuously with log-amps?
A. In(x)
B. log(x)
C. Sinh(x)
D. All of the mentioned