Analog Electronics Online Exam Quiz

Important questions about Analog Electronics. Analog Electronics MCQ questions with answers. Analog Electronics exam questions and answers for students and interviews.

2. DC amplifiers have a tendency to be unstable.

Options

A : True

B : False

C :

D :

5. A forward voltage of 9 V is applied to a diode in series with a 1 k? load resistor. The voltage across load resistor is zero. It indicates that

Options

A : diode is short circuited

B : diode is open circuited

C : resistor is open circuited

D : diode is either short circuited or open circuited

6. To prevent a DC return between source and load, it is necessary to use

Options

A : resistor between source and load

B : inductor between source and load

C : capacitor between source and load

D : either (a) or (b)

7. The self bias provides

Options

A : stable Q point

B : large voltage gain

C : high input impedance

D : high base current

8. The quiescent collector current I C , and collector to emitter voltage V CE in a CE connection are the values when

Options

A : ac signal is zero

B : ac signal is low

C : ac signal is negative

D : either (a) or (b)

1. In a BJT circuit a pnp transistor is replaced by npn transistor. To analyse the new circuit

Options

A : all calculations done earlier have to be repeated

B : replace all calculated voltages by reverse values

C : replace all calculated currents by reverse values

D : replace all calculated voltages and currents by reverse values

2. An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a

Options

A : sine wave

B : square wave

C : triangular wave

D : (a) or (c)

3. If an amplifier with gain of - 1000 and feedback factor ? = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be

Options

A : 10%

B : 5%

C : 0.2%

D : 0.01%

5. To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use

Options

A : surge resistor

B : surge inductor

C : surge capacitor

D : both (a) and (b)

8. A half wave diode rectifier has a capacitance input filter. If input voltage is V m sin ? t , PIV is

Options

A : V m

B : 2 V m

C : 3 V m

D : 4 V m

9. The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier.

Options

A : True

B : False

C :

D :

2. For a system to work, as oscillator the total phase shift of the loop gain must be equal to

Options

A : 90°

B : 45°

C : 270°

D : 360°

4. An RC coupled amplifier has an open loop gain of 200 and a lower cutoff frequency of 50 Hz. If negative feedback with ? = 0.1 is used, the lower cut off frequency will be

Options

A : about 50 Hz

B : about 5 Hz

C : about 2.38 Hz

D : about 70.5 Hz

5. For a base current of 10 ?A, what is the value of collector current in common emitter if ? dc = 100

Options

A : 10 ?A

B : 100 ?A

C : 1 mA

D : 10 mA

6. Assertion (A): CE amplifier is the most widely used BJT amplifier Reason (R): CE amplifier has zero phase difference between input and output

Options

A : Both A and R are correct and R is correct explanation for A

B : Both A and R are correct but R is not correct explanation for A

C : A is correct R is wrong

D : A is wrong R is correct

7. Maximum efficiency of class B power amplifier is 50%.

Options

A : True

B : False

C :

D :

1. The load impedance Z L of a CE amplifier has R and L in series. The phase difference between output and input will be

Options

A : 180°

B : 0

C : more than 90° but less than 180°

D : more than 180° but less than 270°

2. An amplifier with loop gain A? will be more stable for value of A? as

Options

A : 0.95

B : 0.7

C : 1.2

D : 1.5

3. A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is R L and filter capacitance is C. For good output wave shape, the time constant R L C should be at least equal to

Options

A : 10 ms

B : 20 ms

C : 50 ms

D : 100 ms

5. An exponential amplifier has diode in feedback path.

Options

A : True

B : False

C :

D :

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