Operational Amplifier Objective Questions:


Q1.   An operational amplifier is a _____ gain and _____ bandwidth differential amplifier.

1.    very low, narrow
2.    low, wide
3.    medium, narrow
4.    very high, wide

Ans : 4

Q2.  An operational amplifier has a _____ input impedance and a _____ output impedance.

1.    high, low
2.    high, high
3.    low, low
4.    low, high

Ans : 1


Q3.  The output signal of an op-amp is _____ out of phase with its input signal connected to the inverting input terminal.
1.    0º
2.    90º
3.    180º
4.    270º

Ans : 3

Q4.   In double-ended (differential) input operation, _____.

1.    an input is applied between the two input terminals
2.    two separate signals are applied to the input terminals
3.    either an input is applied between the two input terminals or two separate signals are applied to the input terminals
4.    none of the above

Ans :  3

Q5 .  An input applied to either input terminal will result in _____.

1.    outputs from both output terminals, which have opposite polarities
2.    outputs from both output terminals, which have the same polarities
3.    a single output from one of the output terminals
4.    none of the above

Ans :  1


Q6 . The difference output is _____ as large as either VO 1 or VO 2.

1.    once
2.    twice
3.    three times
4.    four times

Ans :   2

Q7 .  In a differential connection, the signals that are opposite at the inputs are _____ amplified, and those that are common to the two inputs are _____ amplified.

1.    slightly, slightly
2.    slightly, highly
3.    highly, highly
4.    highly, slightly

Ans :   4

Q8 . When both input signals are the same, a common signal element due to the two inputs can be defined as the _____ of the two signals.

1.    difference
2.    sum
3.    average of the sum
4.    product

Ans :   3

Q9 . The common-mode rejection ratio (CMRR) is defined by _____.

1.    Ad / Ac
2.    Ac / Ad
3.    Ad x Ac
4.    Ad + Ac

Ans :   1

Q10 . Ideally, the value of the CMRR is _____. Practically, the ____________ the value of CMRR, the better the circuit operation.

1.    zero, smaller
2.    infinite, larger
3.    zero, larger
4.    infinite, smaller

Ans :  2

Q11 .  An ideal op-amp circuit has _____input impedance, _____ output impedance, and _____ voltage gain.

1.    zero, infinite, infinite
2.    infinite, zero, zero
3.    zero, zero, infinite
4.    infinite, zero, infinite

Ans :  4

Q12 .  In a basic op-amp connection, the ratio of overall output to input voltage is dependent only on the value(s) of resistor(s) _____.

1.    R1
2.    Af
3.    R1 and Rf
4.    none of the above

Ans :  3

Q13 .  The _____ amplifier is the most widely used constant-gain amplifier circuit.

1.    inverting
2.    noninverting
3.    differential
4.    none of the above

Ans :   1

Q14 .  The feedback component of an integrator is a(n) _____.

1.    resistor
2.    capacitor
3.    inductor
4.    diode

Ans :   2

Q15 . The analog-computer representation of an op-amp circuit indicates only the _____.

1.    values of the resistors
2.    overall gain
3.    scale factor for each input
4.    none of the above

Ans :   3

Q16 .    _____ is the unit for the slew rate, SR.

1.    V/ms
2.    ms/V
3.    V
4.    V/s

Ans :   1

Q17 . The maximum frequency at which an op-amp may operate depends on the _____.

1.    bandwidth (BW)
2.    slew rate (SR)
3.    unity-gain bandwidth
4.    all of the above

Ans :   4

Q18 . The largest supply voltage for a mA741M is _____.

1.    a dual supply of 18 V
2.    a dual supply of 22 V
3.    a single supply of –18 V
4.    a single supply of +18 V

Ans :   2

Q19 . The IC can internally dissipate from _____ to _____ mW.

1.    5, 50
2.    100, 200
3.    310, 570
4.    750, 950

Ans :   4

Q20 .   As the supply voltage increases, the voltage gain of the circuit _____ and the power consumption _____.

1.    increases, increases
2.    increases, decreases
3.    decreases, decreases
4.    decreases, increases

Ans :  2

Q21 .  As the frequency increases, the input impedance of an op-amp _____ and the output impedance _____.
1.    increases, increases
2.    increases, decreases
3.    decreases, decreases
4.    decreases, increases

Ans :   3

Q22 .  Inverting amplifier connection is more widely used because it has _____.

1.    higher gain
2.    better frequency stability
3.    unit gain
4.    none of the above

Ans :   4
Q23 . The voltage gain of an inverting op-amp circuit is _____ the gain of a noninverting op-amp circuit using the same resistors.

1.    smaller than
2.    larger than
3.    the same as
4.    none of the above

Ans :    2
Q24 .  The output offset voltage is determined by _____.

1.    the input offset voltage
2.    the closed-loop gain
3.    both the input offset voltage and the closed-loop gain
4.    none of the above

Ans :    1

Q25 .  The ratio of the unity-gain frequency to the cutoff frequency is numerically equal to the level of _____.

1.    CMRR
2.    common-mode gain
3.    closed-loop gain
4.    open-loop gain

Ans :    3