Description : What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth

**Answer** : What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth

Description : A transfer function has a second order denominator and constant gain in the numerator

**Answer** : A transfer function has a second order denominator and constant gain in the numerator the system has two zeros at infinity

Description : If the gain of the open loop system is doubled, the gain margin (1) Is not affected (2) Gets doubled (3) Becomes half (4) Becomes one -forth

**Answer** : If the gain of the open loop system is doubled, the gain margin Becomes half

Description : The gain of an ideal amplifier must be

**Answer** : The gain of an ideal amplifier must be infinity

Description : A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain? A) Ac = 0.125 B) Ac = 0.33 C) Ac = 3 D) Ac = 28

**Answer** : A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain? A) Ac = 0.125 B) Ac = 0.33 C) Ac = 3 D) Ac = 28

Description : The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz

**Answer** : The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz

Description : What is the current gain?

**Answer** : Current gain β = Ic/Ib

Description : What is the formula for resistivity?

**Answer** : Resitivity is the property of a material. It is given in ρ . R=ρ L/A is the formula. where , Resitance is directly proportional to Length & Inversely proportional to Area of ... the resistance offered by a conductor to the flow of current is called specific resistance or resistivity.

Description : Define gain and bandwidth of an amplifier.

**Answer** : Bandwidth The range of frequency over which the voltage gain is equal to or greater than 70.7% of its maximum value Gain: The ratio of output parameter (voltage/ current /power) to the input parameter (voltage/ current /power) of an amplifier is known as gain. It is denoted by a letter A

Description : If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be A) 0.98 B) 0.41 C) 59 D) 55

**Answer** : If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be 0.98

Description : A differential amplifier has a differential gain of 20,000, CMRR : 80 dB. The common mode gain is given by

**Answer** : A differential amplifier has a differential gain of 20,000, CMRR : 80 dB. The common mode gain is given by 2

Description : An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is (1) 141 (2) 92.3 (3) 9.23 (4) 1.41

**Answer** : An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is 9.23

Description : The voltage gain of a common -source JFET amplifier depends up on its (1) Input impedance (2) Amplification factor (3) Dynamic drain resistance (4) Drain load resistance

**Answer** : 2

Description : The effect of a finite gain of an operational amplifier used in an integrator is that (A) it would not integrate (B) the slope of the output will vary with time (C) the final value of the output voltage will reduce (D) there will be instability in the circuit

**Answer** : The effect of a finite gain of an operational amplifier used in an integrator is that there will be instability in the circuit

**Answer** : The voltage gain of triode depends on plate voltage.

Description : Which configuration has the lowest current gain ?

**Answer** : Common base configuration has the lowest current gain.

Description : Mason's Gain Formula Problem 2

**Answer** : Mason's Gain Formula Problem 2

Description : Mason's Gain Formula Problem 1

**Answer** : Mason's Gain Formula Problem 1

Description : Wye and delta conversion formula

**Answer** : Wye and delta conversion formula

Description : Self inductance formula

**Answer** : Self inductance formula

Description : Resistance formula

**Answer** : The formula for resistance is, Where, R = resistance in Ohms ρ = resistivity in ohm - metre l = length A = cross sectional area

Description : Permeability formula

**Answer** : Permeability formula

Description : Magnetomotive force formula

**Answer** : Magnetomotive force formula

Description : Flux density formula

**Answer** : Flux density formula

Description : Field intensity formula

**Answer** : Field intensity formula

Description : Energy stored in electrostatic field of capacitance formula

**Answer** : Energy stored in electrostatic field of capacitance formula

Description : Electric power formula

**Answer** : Electric power formula

Description : Conductivity formula

**Answer** : Conductivity formula

Description : Conductance formula

**Answer** : Conductance formula

Description : Capacitive reactance

**Answer** : Capacitive reactance formula

Description : Capacitive current

**Answer** : Capacitive current formula

Description : Define magnetic flux density and state its formula.

**Answer** : The magnetic flux per unit area is called as magnetic flux density. Magnetic flux density is denoted by B. The formula for magnetic flux density is Weber per metre square or Tesla. Mathematically ... the unit of magnetic flux density is Weber per metre square which is also called as Tesla.

Description : The following formula is correct: (A) Load factor=Average load for a period/ Peak load for the same period (B) Load factor=Average load for a period x Peak load for the same period (C) Load factor=Average load for a period + Peak load for the same period (D) All of the above

**Answer** : The following formula is correct: (A) Load factor=Average load for a period/ Peak load for the same period (B) Load factor=Average load for a period x Peak load for the same period (C) Load factor=Average load for a period + Peak load for the same period (D) All of the above

**Answer** : R=V÷I R= Resistance value(ohm) V=Potential different between two point(volt) I=Current(Amp)

Description : In the PID controller, which gain term only effects the transient response? Why?

Description : A system is critically damped. If the gain of the system is increased, the system will behave as: A) overdamped B) underdamped C) oscillatory D) critically damped

**Answer** : A system is critically damped. If the gain of the system is increased, the system will behave as: underdamped

Description : A system with gain margin close to unity or a phase margin close to zero is (a) conditionally stable (b) relatively stable (c) highly stable (d) highly oscillatory

Description : By increasing the gain ‘k’ of a system, steady state error of the system (a) increases (b) decreases (c) remains unaffected (d) nothing can be said

Description : The sensitivity of a closed loop system to gain changes and load disturbances depends upon (a) forward gain (b) loop gain (c) frequency (d) all the above

Description : The characteristic equation for a closed loop system with forward gain K is s4 + 4s3 + 8s2 + 6s + K = 0. The critical gain value Kc for stability should not exceed (a) 3.25 (b) 9.75 (c) 13.0 (d) 23.3

**Answer** : The characteristic equation for a closed loop system with forward gain K is s4 + 4s3 + 8s2 + 6s + K = 0. The critical gain value Kc for stability should not exceed (a) 3.25 (b) 9.75 (c) 13.0 (d) 23.3

Description : In lag compensator the damping ratio, gain and steady state error (ess) are (a) Decreases, Decreases and Increases (b) Decreases, Increases and Increases (c) Increases, Increases and Decreases (d) Increases, Decreases and Decreases

**Answer** : In lag compensator the damping ratio, gain and steady state error (ess) are Increases, Decreases and Decreases

Description : The gain margin of a system is 0 dB. It represents a (a) Stable system (b) Unstable system (c) Marginally stable system (d) Conditionally stable system

**Answer** : The gain margin of a system is 0 dB. It represents a Marginally stable system

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