ELECTRICAL OBJECTIVE QUESTIONS WITH ANSWERS: Electronic Devices, Amplifiers Solved Objectives: Part-1

Electronic Devices Objective Questions:

[1] The action of JFET in its equivalent circuit can be represented as a

A. Current controlled Current source

B. Current controlled Voltage source

C. Voltage controlled Voltage source

D. Voltage controlled Current source

[2] A change in the value of the emitter resistance Re in a differential amplifier

A. Affects the difference mode gain Ad

B. Affects the common mode gain Ac

C. Affects both Ad and Ac

D. Does not effect either Ad and Ac

[3] Generally, the gain of a transistor amplifier falls at high frequencies due to the

A. Internal Capacitance of the device

B. Coupling capacitor at the input

C. Skin effect

D. Coupling capacitor at the output

[4] In a common emitter, unbypassed resistor provides

A. Voltage shut feedback

B. Current series feedback

C. Negative voltage feedback

D. Positive current feedback

[5] A constant current signal across a parallel RLC circuits gives an o/p of 1.4V at the signal frequency of 3.89kHz. At the frequency of 4 kHz, the o/p voltage will be

A. 1 V

B. 2 V

C. 1.4 V

D. 2.8 V

[6] Class AB operation is often used in power (large signal) amplifiers in order to

A. Get maximum effeciency

B. Remove even harmonics

C. Overcome a crossover distortion

D. Reducing collector dissipation

[7] The bandwidth of an RF tuned amplifier is dependent on

A. Q-factor of the tuned O/P circuit

B. Q-factor of the tuned I/P circuit

C. Quiescent operating point

D. Q-factor of the O/P and I/P circuits as well as quiescent operating point

[8]Most of the linear ICs are based on the two-transistor differential amplifier because of its

A. Input voltage dependent linear transfer characteristics

B. High voltage gain

C. High input resistance

D. High CMMR

[9] Negative feedback in an amplifier

A. Reduces gain

B. Increase frequency and phase distortion

C. Reduces bandwidth

D. Increase Noise

10] A dc power supply has no-load voltage of 30V and a full-load voltage of 25V at full-load current of 1A. Its output resistance and load regulation respectively are

A. 5Ω & 20%

B. 25Ω & 20%

C. 5Ω &16.7%

D. 25Ω & 16.7%