101. Find the output voltage of the log-amplifier

A. V_{O} = -(kT)×ln(V_{i}/V_{ref})

B. V_{O} = -(kT/q)×ln(V_{i}/V_{ref})

C. V_{O} = -(kT/q)×ln(V_{ref}/V_{i})

D. V_{O} = (kT/q)×ln(V_{i}/V_{ref})

102. How to provide saturation current and temperature compensation in log-amp?

A. Applying reference voltage alone to two different log-amps

B. Applying input and reference voltage to same log-amps

C. Applying input and reference voltage to separate log-amps

D. None of the mentioned

103. The input voltage, 6v, and reference voltage, 4 v are applied to a log-amp with saturation current and temperature compensation. Find the output voltage of the log-amp?

A. 6.314(kT/q)v

B. 0.597(kT/q)v

C. 0.405(kT/q)v

D. 1.214(kT/q)v

104. Determine the output voltage for the given circuit

A. V_{O} = V_{ref}/(10^{-k’vi})

B. V_{O} = V_{ref}+(10^{-k’vi})

C. V_{O} = V_{ref}×(10^{-k’vi})

D. V_{O} = V_{ref}-(10^{-k’vi})

105. Calculate the base voltage of the Q_{2} transistor in the log-amp using two op-amps?

A. 8.7v

B. 5.3v

C. 3.3v

D. 6.2v

106. Determine output voltage of analog multiplier provided with two input signals V_{x} and V_{y}.

A. V_{o} = (V_{x} ×V_{x}) / V_{y}

B. V_{o} = (V_{x} ×V_{y} / V_{ref}

C. V_{o} = (V_{y} ×V_{y}) / V_{x}

D. V_{o} = (V_{x} ×V_{y}) / V_{ref}^{2}

107. Match the List-I with list-II

List-I | List-II |

1. One quadrant multiplier | i. Input 1- Positive, Input 2- Either positive or negative |

2. Two quadrant multiplier | ii. Input 1- Positive, Input 2 – Positive |

3. Four quadrant multiplier | iii. Input 1- Either positive or negative, Input 2- Either positive or negative |

A. 1-ii, 2-i, 3-iii

B. 1-ii, 2-ii, 3-ii

C. 1-iii, 2-I, 3-ii

D. 1-I, 2-iii, 3-i

108. What is the disadvantage of the log-antilog multiplier?

A. Provides four-quadrant multiplication only

B. Provides one quadrant multiplication only

C. Provides two and four-quadrant multiplication only

D. Provides one, two, and four-quadrant multiplication only

109. An input of Vsinωt is applied to an ideal frequency doubler. Compute its output voltage?

A. V_{o} = [(V_{x}×V_{y}) /V_{ref}^{2}] × [1-cos2ωt/2].

B. V_{o} = [(V_{x}^{2}×V_{y}^{2}) /V_{ref}] × [1-cos2ωt/2].

C. V_{o} = [(V_{x}×V_{y})^{2} /V_{ref}] × [1-cos2ωt/2].

D. V_{o} = [(V_{x}×V_{y}) /( V_{ref}] × [1-cos2ωt/2].

110. Find the output voltage for the squarer circuit given below, choose input frequency as 10kHz and V_{ref} =10v

A. V_{o} = 5.0-(5.0×cos4π×10^{4}t)

B. V_{o} = 2.75-(2.75×cos4π×10^{4}t)

C. V_{o} = 1.25-(1.25×cos4π×10^{4}t)

D. None of the mentioned

111. Calculate the phase difference between two input signals applied to a multiplier, if the input signals are V_{x}= 2sinωt and V_{y}= 4sin(ωt+θ). (Take V_{ref}= 12v).

A. θ = 1.019

B. θ = 30.626

C. θ = 13.87

D. θ = 45.667

112. Express the output voltage equation of the divider circuit

A. V_{o}= -(V_{ref}/2)×(V_{z}/V_{x})

B. V_{o}= -(2×V_{ref})×(V_{z}/V_{x})

C. V_{o}= -(V_{ref})×(V_{z}/V_{x})

D. V_{o}= -V_{ref}^{2}×(V_{z}/V_{x})

113. Find the input current for the circuit given below.

A. I_{Z} = 0.5372mA

B. I_{Z} = 1.581mA

C. I_{Z} = 2.436mA

D. I_{Z} =9.347mA

114. Find the condition at which the output will not saturate?

A. V_{x} > 10v ; V_{y} > 10v

B. V_{x} < 10v ; V_{y} > 10v

C. V_{x} < 10v ; V_{y} < 10v

D. V_{x} > 10v ; V_{y} < 10v

115. Determine the relationship between log-antilog method.

A. lnV_{x}×lnV_{y} = ln(V_{x}+V_{y})

B. lnV_{x} / lnV_{y} = ln(V_{x}-V_{y})

C. lnV_{x} -lnV_{y} = ln(V_{x}/V_{y})

D. lnV_{x}+ lnV_{y} = ln(V_{x}×V_{y})

116. Which circuit allows doubling the frequency?

A. Frequency doubler

B. Square doubler

C. Double multiplier

D. All of the mentioned

117. Compute the output of the frequency doubler. If the inputs V_{x} = Vsinωt and V_{y} = Vision(ωt+θ) are applied to a four-quadrant multiplier?

A. V_{o}= { V_{x}×V_{y}× [cosθ-(cosθ×cos2ωt)+(sinθ×sin2ωt)]}/ V_{ref}

B. V_{o}= { V_{x}×V_{y}× [cosθ-(cosθ×cos2ωt)+(sinθ×sin2ωt)]}/ 2

C. V_{o}= { V_{x}×V_{y}× [cosθ-(cosθ×cos2ωt)+(sinθ×sin2ωt)]}/(2×V_{ref})

D. V_{o}= – { V_{x}×V_{y}× [cosθ-(cosθ×cos2ωt)+(sinθ×sin2ωt)]}/(2×V_{ref})

118. How to remove the dc term produced along with the output in the frequency doubler?

A. Use a capacitor between load and output terminal

B. Use a resistor between load and output terminal

C. Use an Inductor between load and output terminal

D. Use a potentiometer between load and output terminal

119. Find the voltage range at which the multiplier can be used as a squarer circuit?

A. 0 – V_{in}

B. V_{ref} – V_{in}

C. 0 – V_{ref}

D. All of the mentioned

120. Calculate the output voltage of a squarer circuit, if its input voltage is 3.5v. Assume V_{ref} = 9.67v.

A. 2.86v

B. 1.27v

C. 10v

D. 4.3v