The upper threshold frequency of an FET, where short circuit gain is unity is given by:

Select the order in which the frequency should be maintained to enhance the stability of differentiator? Where fa -> Frequency at which gain =0 ; fb -> Gain limit frequency ; fc -> Unity gain bandwidth.

A

fa b c

B

fa > fb > fc

C

fb c > fa

D

fb c a

Consider the following statements (a) BJT is a current controlled device with high input impedance and high gain band width (b) FET is a voltage- controlled device with high input impedance and low gain bandwidth (c) UJT is a negative resistance device and can be used as an oscillator (d) FET and UJT can be used for amplification Which of the above statements are correct

A

(a) and (b)

B

(b) and (c)

C

(c) and (d)

D

(a) and (d)

An inverting amplifier with nominal gain of −20 V/V employs an op amp having a dc gain of 104 and a unity-gain frequency of 106 Hz. What is the 3-dB frequency f3dB of the closed-loop amplifier?

A

2π 23.8 kHz

B

2π 47.6 kHz

C

2π 71.4 kHz

D

2π 95.2 kHz

Short circuit test is performed on a transformer with a certain impressed voltage at rated frequency. What will happen if the short circuit test is now performed with the same magnitude of impressed voltage, but at frequency higher than the rated frequency?

A

The magnitude of current will increase, but power factor will decrease

B

The magnitude of current will decrease, but power factor will increase

C

The magnitude of current will increase, power factor will increase

D

The magnitude of current will decrease, power factor will decrease

Consider the following statements regarding a differential amplifier using an FET pair. The differential output offset voltage is due to: 1. Mismatch between FET parameters 2. Difference between the values of resistors used in the circuit even though they are marked nominally equal 3. Variation in the operating voltage of the circuit Which of the above statements are correct?

A

1, 2 and 3

B

2 and 3 only

C

1 and 3 only

D

1 and 2 only

If a transistor has a short circuit current gain of 25 and the capacitance measured in the hybrid-π model of the transistor was 60 pF. Then the threshold frequency of operation of the transistor is:

A

60 MHz

B

45.6 GHz

C

66.3 GHz

D

34.8 GHz

Two non-inverting amplifiers, with gain =1 and gain=20 are made using identical operational amplifiers. As compared to the unity gain amplifier, the amplifier with gain=20 has ___________

A

More input impedance

B

Less negative feedback

C

Less Bandwidth

D

Less input impedance

According to National Curriculum Framework (NCF), 2005 which of the following statement(s) is/are correct regarding teaching History at the upper primary stage? I. At the upper primary stage, History must focus on developments in India. II. At the upper primary stage, History will take into account developments in different parts of India, with sections on events or developments in other parts of the world. III. At the upper primary stage, History will only take into account development in different parts of India.

A

Only I

B

Only III

C

Only II

D

I, II and III

Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R). Read the statements and choose the correct answer.
Assertion (A): Purchase decisions are not based on how customers perceive prices but on the marketer's stated price.
Reason (R): Customers may have a lower price threshold, below which prices signal inferior or unacceptable quality, and an upper price threshold where the product appears not worth the money.

A

Both (A) and (R) are correct and (R) is the right explanation of (A)

B

Both (A) and (R) are correct, but (R) is not the right explanation of (A)

C

Both (A) and (R) are incorrect

D

(A) is incorrect, but (R) is correct

The expression for short circuit current gain of an FET is given by:

A

gm/ ωCgs

B

Ig/gmVc

C

ωCgs/ gm

D

none of the mentioned

The upper threshold frequency of an FET, where short circuit gain is unity is given by:

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