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Transistor Tuned Amplifiers

Study 40 Electrical Engineering MCQs with correct answers and explanations.

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11Electrical EngineeringMedium

At series resonance, voltage across L is________voltage across C?

AEqual to but in phase with

BEqual to but opposite in phase to

CGreater than but in phase with

DLess than but in phase with

Correct answer

B. Equal to but opposite in phase to

Explanation

The correct answer is Equal to but opposite in phase to.

12Electrical EngineeringMedium

The Q of an LC circuit is given by ________?

AR / 2pfrL

BR2/2pfrL

C2pfr x R

D2pfrL / R

Correct answer

D. 2pfrL / R

Explanation

The correct answer is 2pfrL / R.

13Electrical EngineeringMedium

At parallel resonance, the line current is________?

ANone of the above

BMaximum

CMinimum

DQuite large

Correct answer

C. Minimum

Explanation

The correct answer is Minimum.

14Electrical EngineeringMedium

For frequencies above the resonant frequency, a parallel LC circuit behaves as a ________ load?

ACapacitive

BInductive

CNone of the above

DResistive

Correct answer

A. Capacitive

Explanation

The correct answer is Capacitive.

15Electrical EngineeringMedium

The Q of a tuned amplifier is 50. If the resonant frequency for the amplifier is 1000kHZ, then bandwidth is ________?

A40 kHz

B30 kHz

C20 kHz

D10kHz

Correct answer

C. 20 kHz

Explanation

The correct answer is 20 kHz.

16Electrical EngineeringMedium

The voltage gain of a tuned amplifier is________at resonant frequency

AZero

BMinimum

CMaximum

DHalf-way between maximum and minimum

Correct answer

C. Maximum

Explanation

The correct answer is Maximum.

17Electrical EngineeringMedium

At series or parallel resonance, the circuit behaves as a ________ load?

AResistive

BInductive

CCapacitive

DNone of the above

Correct answer

A. Resistive

Explanation

The correct answer is Resistive.

18Electrical EngineeringMedium

The Q of a tuned circuit refers to the property of________?

ANone of the above

BSelectivity

CFidelity

DSensitivity

Correct answer

B. Selectivity

Explanation

The correct answer is Selectivity.

19Electrical EngineeringMedium

In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then ________?

ABoth XL and XC decrease

BBoth XL and XC increase

CXL increases and XC decreases

DXL decreases and XC increases

Correct answer

C. XL increases and XC decreases

Explanation

The correct answer is XL increases and XC decreases.

20Electrical EngineeringMedium

The Q of a tuned amplifier is generally ________?

AMore than 10

BLess than 5

CLess than 10

DNone of the above

Correct answer

A. More than 10

Explanation

The correct answer is More than 10.

11Electrical EngineeringMedium

At series resonance, voltage across L is________voltage across C?

AEqual to but in phase with

BEqual to but opposite in phase to

CGreater than but in phase with

DLess than but in phase with

Correct answer

B. Equal to but opposite in phase to

Explanation

The correct answer is Equal to but opposite in phase to.

12Electrical EngineeringMedium

The Q of an LC circuit is given by ________?

AR / 2pfrL

BR2/2pfrL

C2pfr x R

D2pfrL / R

Correct answer

D. 2pfrL / R

Explanation

The correct answer is 2pfrL / R.

13Electrical EngineeringMedium

At parallel resonance, the line current is________?

ANone of the above

BMaximum

CMinimum

DQuite large

Correct answer

C. Minimum

Explanation

The correct answer is Minimum.

14Electrical EngineeringMedium

For frequencies above the resonant frequency, a parallel LC circuit behaves as a ________ load?

ACapacitive

BInductive

CNone of the above

DResistive

Correct answer

A. Capacitive

Explanation

The correct answer is Capacitive.

15Electrical EngineeringMedium

The Q of a tuned amplifier is 50. If the resonant frequency for the amplifier is 1000kHZ, then bandwidth is ________?

A40 kHz

B30 kHz

C20 kHz

D10kHz

Correct answer

C. 20 kHz

Explanation

The correct answer is 20 kHz.

16Electrical EngineeringMedium

The voltage gain of a tuned amplifier is________at resonant frequency

AZero

BMinimum

CMaximum

DHalf-way between maximum and minimum

Correct answer

C. Maximum

Explanation

The correct answer is Maximum.

17Electrical EngineeringMedium

At series or parallel resonance, the circuit behaves as a ________ load?

AResistive

BInductive

CCapacitive

DNone of the above

Correct answer

A. Resistive

Explanation

The correct answer is Resistive.

18Electrical EngineeringMedium

The Q of a tuned circuit refers to the property of________?

ANone of the above

BSelectivity

CFidelity

DSensitivity

Correct answer

B. Selectivity

Explanation

The correct answer is Selectivity.

19Electrical EngineeringMedium

In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then ________?

ABoth XL and XC decrease

BBoth XL and XC increase

CXL increases and XC decreases

DXL decreases and XC increases

Correct answer

C. XL increases and XC decreases

Explanation

The correct answer is XL increases and XC decreases.

20Electrical EngineeringMedium

The Q of a tuned amplifier is generally ________?

AMore than 10

BLess than 5

CLess than 10

DNone of the above

Correct answer

A. More than 10

Explanation

The correct answer is More than 10.