Which of the following statement about receivers is false? Double conversion is

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Question
Which of the following statement about receivers is false?
Options
A. Double conversion is used to improve image rejection
B. Double conversion is used to improve selectivity
C. Variable sensitivity is used to improve selectivity
D. Variable sensitivity is used to eliminate selective fading

Correct Answer

Variable sensitivity is used to eliminate selective fading

More questions

1. Assertion (A): Inverters and choppers use fast switching thyristors
Reason (R): Fast switching SCR has low turn off time.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

2. Match the following:

	List I		List II
A.		1.
B.		2.
C.		3.
D.		4.
		5.

Options
A. A-2, B-4, C-3, D-5
B. A-3, B-4, C-2, D-5
C. A-5, B-2, C-3, D-1
D. A-3, B-1, C-2, D-4

3. Assertion (A): A small section of high impedance line is equivalent to a series inductance.
Reason (R): A small section of a low impedance line is equivalent to a series resistance.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

4. Assertion (A): Two equal and opposite travelling waves result in a standing wave.
Reason (R): The ratio of maximum to minimum value of a standing wave is called SWR.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

6. Match the following:

	List I		List II
A.	A₁ cos 2pf₁t	1.
B.	A₁ A₂ cos 2pf₁t cos 2pf₂t	2.	v₁ (t) v₂ (t)
C.		3.	, f₁, - f₁
D.	f₁ + f₂, f₁ - f₂, - f₁ + f₂, - f₁ - f₂	4.	A₁ cos ?₁t

Options
A. A-3, B-1, C-4, D-2
B. A-1, B-2, C-3, D-4
C. A-4, B-2, C-1, D-3
D. A-3, B-1, C-2, D-4

7. Match the following:

	List I (Operation in Basic)		List II (Priority)
A.	Exponentiation	1.	1
B.	Multiplication and division	2.	2
C.	Addition and subtraction	3.	3
D.	Expression within parenthesis	4.	4

Options
A. A-1, B-2, C-3, D-4
B. A-2, B-3, C-1, D-4
C. A-4, B-3, C-2, D-1
D. A-2, B-3, C-4, D-1

8. Match the following:

	List I (Double Rectifier)		List II (Number of Diodes)
A.	Full wave Bridge rectifier	1.	1
B.	Half wave rectifier	2.	2
C.	Full wave rectifier using centre tapped transformer	3.	4

Options
A. A-1, B-2, C-3
B. A-3, B-1, C-2
C. A-2, B-1, C-3
D. A-3, B-1, C-2

9. Match the following:

	List I (BJT amplifier)		List II (Characteristics)
A.	CE	1.	good voltage gain, good current gain
B.	CC	2.	voltage gain less than 1, high current gain
C.	CB	3.	current gain less than 1, voltage gain high

Options
A. A-1, B-2, C-3
B. A-1, B-2, C-3
C. A-3, B-1, C-2
D. A-3, B-2, C-1

10. A parallel plate capacitor has area of plate equal to 1 m and distance between plates is also 1 m². The lossy dielectric has a complex dielectric constant ?_r = ?'_r - j ?"_r. If the capacitor is represented by R and C is parallel, then
Options
A.
B.
C.
D.

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