In class-A amplifier conduction extends over 360° because the operating point. 

1. Located near saturation point 2. Located at or near cut-off point 3. Located on load line 4. Located in the centre of load line 

1 Answer

Answer :

In class-A amplifier conduction extends over 360° because the operating point. 

1. Located near saturation point 2. Located at or near cut-off point 3. Located on load line 4. Located in the centre of load line 

Related questions

Description : An amplifier operating over the frequency range from 18 to 20 MHz has 10 kilo ohm input resistor. What is the r.m.s. noise voltage at the input to this amplifier if the ambient temperature is 27o C

Last Answer : An amplifier operating over the frequency range from 18 to 20 MHz has 10 kilo ohm input resistor. What is the r.m.s. noise voltage at the input to this amplifier if the ambient temperature is 27o C 18.2 microvolt

Description : Class A amplifier is used when  (A) No phase inversion is required (B) Highest voltage gain is required (C) dc voltages are to be amplified (D) Minimum distortion is desired. 

Last Answer : Class A amplifier is used when Minimum distortion is desired. 

Description : In class - A power amplifier, the collector dissipation is maximum when  (a) no signal is present  (b) signal swing is maximum  (c) signal swing is (1/1.414) of its maximum  (d) none of the above

Last Answer : In class - A power amplifier, the collector dissipation is maximum when no signal is present

Description : In Class ‘B’ amplifier, the output current flows for

Last Answer : In Class ‘B’ amplifier, the output current flows for half input cycle

Description : The efficiency of a class B push-pull amplifier is

Last Answer : The efficiency of a class B push-pull amplifier is 75-80%

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 

Last 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 : The ideal operational amplifier does not have: (1) Infinite input resistance (2) Infinite output resistance (3) Infinite voltage gain (4) Infinite bandwidth 

Last Answer : The ideal operational amplifier does not have: Infinite output resistance

Description : An amplifier without feedback has a voltage gain of 50, input resistance 1kΩ and output resistance of 2.5kΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 would be: (1) 1/11 kΩ (2) 1/5 kΩ (3) 5 kΩ (4) 11 kΩ

Last Answer : An amplifier without feedback has a voltage gain of 50, input resistance 1kΩ and output resistance of 2.5kΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 would be: 1/11 kΩ

Description : The gain of an FET amplifier can be changed by changing: (1) rm (2) gm (3) Rd (4) None of these

Last Answer : The gain of an FET amplifier can be changed by changing: gm

Description : If the feedback factor of an amplifier is 0.1 and its gain without feedback is 40, then its gain with feedback is (a) – 13.3 (b) 200 (c) 8 (d) 10 

Last Answer : If the Feedback Factor of an amplifier is 0.1 and its gain without feedback is 40, then feedback is 40,then its gain with feedback is 8.

Description : A low noise amplifier has an effective noise temperature of 50 k. The absolute noise figure is

Last Answer : A low noise amplifier has an effective noise temperature of 50 k. The absolute noise figure is 1.172

Description : For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to

Last Answer : For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to inverse of feedback factor

Description : For Cascode amplifier the output impedance becomes 

Last Answer : For Cascode amplifier the output impedance becomes very high

Description : An amplifier without feedback has a gain of 1000. The gain with a negative feedback of 0.009 is  A) 10 B) 100 C) 125 D) 900

Last Answer : 100

Description : An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is  A) 25 micro-volt B) 50 micro-volt C) 5 Volts D) 10 volts

Last Answer : An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is 50 micro-volt

Description : In a radio receiver the IF amplifier  (A) is tuned above the stations incoming frequency (B) amplifies the output of local oscillator (C) is fixed tuned to one particular frequency (D) can be tuned to various isolate frequencies

Last Answer : In a radio receiver the IF amplifier is fixed tuned to one particular frequency

Description : Negative feedback amplifier has a signal corrupted by noise as its input. The amplifier will   (A) Amplify the noise as much as the signal (B) Reduce the noise (C) Increase the noise (D) Not effect the noise

Last Answer : Negative feedback amplifier has a signal corrupted by noise as its input. The amplifier will Reduce the noise

Description : In an IF amplifier, the IF transformer is provided with tapping to  (a) increase the voltage gain (b) increase the bandwidth of the resonance circuit (c) increase the impedance ... resonance circuit to the following cascaded amplifier (d) increase the quality factor of the resonance circuit 

Last Answer : In an IF amplifier, the IF transformer is provided with tapping to increase the voltage gain

Description : In a Klystron amplifier, the RF voltage produces  (a) amplitude modulation (b) frequency modulation (c) phase modulation (d) velocity modulation

Last Answer : In a Klystron amplifier, the RF voltage produces velocity modulation

Description : Which of the following amplifier has the least distortion. • Class E • Class D • Class C • Class A

Last Answer : Which of the following amplifier has the least distortion. • Class E • Class D • Class C • Class A

Description : The battery operated pre-amplifier with a consumption of 10 Watts can work on battery of 12 volt, 100 AH having efficiency of 50% for • 120 hrs. • 60 hrs. • 100 hrs. • 10 hrs.

Last Answer : The battery operated pre-amplifier with a consumption of 10 Watts can work on battery of 12 volt, 100 AH having efficiency of 50% for 60 hrs.

Description : The voltage gain of a common base amplifier depends on  1. Load resistor RL 2. input resistance of transistor 3. Ac alpha 4. All the above 

Last Answer : The voltage gain of a common base amplifier depends on  1. Load resistor RL 2. input resistance of transistor 3. Ac alpha 4. All the above 

Description : Just as a voltage amplifier signal voltage a power amplifier.  1.amplifier power  2.amplifier signal  3.converts the signal ac power into DC power  4.converts a dc power into useful AC power 

Last Answer : Just as a voltage amplifier signal voltage a power amplifier.  1.amplifier power  2.amplifier signal  3.converts the signal ac power into DC power  4.converts a dc power into useful AC power 

Description : Harmonic distortion of the signal is produced in an RC coupled transistor amplifier. The probable component responsible for this distortion is  (A) The transistor itself  (B) the power supply Vcc  (C) the coupling capacitor Cc  (D) the biasing resistors

Last Answer : Harmonic distortion of the signal is produced in an RC coupled transistor amplifier. The probable component responsible for this distortion is The transistor itself 

Description : The main component responsible for the fall of gain of an RC coupled amplifier in low frequency range is  (A) The active device itself (tube, or transistor)  (B) stray shunt capacitance Cs  (C) the grid leak resistance Rg  (D) coupling capacitor Cc

Last Answer : The main component responsible for the fall of gain of an RC coupled amplifier in low frequency range is coupling capacitor Cc

Description : The main function of the transformer used in the output of a power amplifier is  (A) To step up the voltage  (B) to increase the voltage gain  (C) to safeguard the transistor against overheating  (D) to match the load impedance with dynamic output resistance of the transistor

Last Answer : The main function of the transformer used in the output of a power amplifier is to match the load impedance with dynamic output resistance of the transistor

Description : Negative feedback in an amplifier is accompanied by (A) Gain less sensitive to component variations (B) Increase in gain (C) Decrease in bandwidth (D) None of the above

Last Answer : Negative feedback in an amplifier is accompanied by Gain less sensitive to component variations 

Description : What is the importance of negative feedback in the operational amplifier? (A) It maintains the gain (B) The voltage difference between the input terminals is maintained at a very small value ( ... value (D) The voltage difference between the input terminals is maintained at a very high value

Last Answer : The voltage difference between the input terminals is maintained at a very small value

Last Answer : The closed-loop voltage gain of an inverting amplifier equal to The feedback resistance divided by the input resistance.

Description : Cross over distortion in class - B push-p amplifiers:  1. Is due to transistor operating near saturation region  2. Can be eliminated by operating them in class operation  3. Occurs because two power transistors do not exactly matching parameters  4. Always occurs in low signal area

Last Answer : Cross over distortion in class - B push-p amplifiers:  1. Is due to transistor operating near saturation region  2. Can be eliminated by operating them in class operation  3. Occurs because two power transistors do not exactly matching parameters  4. Always occurs in low signal area

Description : Compare Class A ,Class B, Class C and class AB power amplifiers on the basis of: i)Angle of conduction ii)Efficiency iii)Position of operating pointing power dissipation iv)Distortion

Last Answer : Compare Class A ,Class B, Class C and class AB power amplifiers on the basis of: i)Angle of conduction ii)Efficiency iii)Position of operating pointing power dissipation iv)Distortion

Description : If the operating point of an NPN transistor amplifier is selected in saturation region, it is likely to result in A) Thermal runaway of transistor B) Clipping of output in the positive half of the ... for high dc collector supply D) Clipping of output in the negative half of the input signal

Last Answer : B) Clipping of output in the positive half of the input signal

Description : A class is a variable of variable that is declared inside a class as: a) Final b) Static c) Abstract d) Extends e) None of The Above

Last Answer : b) Static

Description : An amplifier operating over the frequency range of 455 to 460 kHz has a 200 kΩ input resistor. What is the RMS noise voltage at the input to this amplifier if the ambient temperature is 17˚C ? A. 40 µV B. 4.0 µV C. 400 µV

Last Answer : B. 4.0 µV

Description : In two stroke engine one power occurs in _______ of crank rotation A. 180° B. 360° C. 270° D. 720°

Last Answer : ANSWER : B

Description : In four stroke engine there is one power stroke in _____ of crankshaft rotation. a. 180° b. 360° c. 540° d. 720° (Ans:d)

Last Answer : The ascending order of strokes in four stroke engine is a. Suction stroke - Expansion stroke - Compression stroke - Exhaust stroke b. Suction stroke - Compression stroke - Expansion stroke -Exhaust ... stroke d. Suction stroke - Compression stroke - Exhaust stroke - Expansion stroke (Ans:b)

Description : The degree measure of Prime Meridian is - (1) 90° (2) 180° (3) 0° (4) 360°

Last Answer : (3) 0° Explanation: A prime meridian is a meridian (a line of longitude) in a geographic coordinate system at which longitude is de fined to be 0°.

Description : What will be the phase angle relationship of a six-pole, three-phase, rotating field generator? A. 60° B. 120° C. 180° D. 360°

Last Answer : Answer: B

Description : The Earth turns through 360° in 24 hours. Howmuch time does Each 15° longitude represent?

Last Answer : One hour

Description : In case of partial bearing, the angle of contact of the bushing with the journal is (A) 270° (B) More than 180° (C) Less than 180° (D) 360°

Last Answer : (C) Less than 180°

Description : In case of full journal bearing, the angle of contact of the bushing with the journal is (A) 60° (B) 90° (C) 180° (D) 360°

Last Answer : (D) 360°

Description : In case of partial bearing, the angle of contact of the bushing with the journal is usually (A) 120° (B) 180° (C) 45° (D) 360°

Last Answer : (A) 120°

Description : Number of degree a complete circle represents is A. 90° B. 180° C. 270° D. 360°

Last Answer : 360°

Description : Phase difference between a node and an antinode is A. 90° B. 45° C. 180° D. 360°

Last Answer : 180°

Description : If isolation factor is negative, then what is the phase difference between transmitted and disturbing force? a) 180° b) 90° c) 450° d) 360°

Last Answer : a) 180°

Description : A traverse deflection angle is  (A) Less than 90°  (B) More than 90° but less than 180°  (C) The difference between the included angle and 180°  (D) The difference between 360° and the included angle 

Last Answer : (C) The difference between the included angle and 180° 

Description : If deflection angles are measured in a closed traverse, the difference between the sum of the right-hand and that of the left hand angles should be equal to (A) 0° (B) 90° (C) 180° (D) 360°

Last Answer : (D) 360°

Description : A transit is oriented by setting its vernier A to read the back azimuth of the preceding line. A back sight on the preceding transit station taken and transit is rotated about its vertical axis. The vernier ... (C) Back bearing of the forward line (D) Equal to 360°-azimuth of the forward line

Last Answer : (A) Azimuth of the forward line

Description : Back bearing of a line is equal to (A) Fore bearing ± 90° (B) Fore bearing ± 180° (C) Fore bearing ± 360° (D) Fore bearing ± 270°

Last Answer : (B) Fore bearing ± 180°

Description : Pick up the correct statement from the following: (A) Phase of a wave is expressed as a fraction of a period with respect to a reference (B) Phase is usually specified by angular measure with ... from the previous passage through zero from the negative to the positive direction (D) All of these

Last Answer : Answer: Option D