The gradient of any scalar field always yields __________ . a solenoidal field a

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Question
The gradient of any scalar field always yields __________ .
Options
A. a solenoidal field
B. a conservative field
C. an irrotational field
D. none of these

Correct Answer

a conservative field

Explanation

Dot product is conservative. Gradient is nothing but dot product.

More questions

1. In 8 cavity magnetron the p mode corresponds to a total phase shift equal to
Options
A. � 8 p radians around the periphery
B. � 4 p radians around the periphery
C. � 2 p radians around the periphery
D. � 16 p radians around the periphery

2. Match the following:

	List I (DOS commands)		List II (Meaning)
A.	DBLSPACE	1.	Deletes a director and its sub-directories
B.	MEM	2.	Displays the amount of used and free memory
C.	SYS	3.	Put a copy of DOS on disk
D.	DELTREE	4.	Compresses files to increase the storage capacity of disc

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

3. In a 3 phase fully controlled converter the firing frequency is
Options
A. 3 times the line frequency
B. 6 times the line frequency
C. 9 times the line frequency
D. 12 times the line frequency

4. Assertion (A): The output voltage of an inverter can be controlled by PWM technique
Reason (R): In a current source inverter the input current is constant.
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

5. Assertion (A): Doping level in extrinsic semiconductors is very small.
Reason (R): Additional of impurity in the ratio of 1 part in 10⁸ parts increases the number of charge carriers by about 20.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

8. Assertion (A): Bolometer is frequently used in microwave power measurement.
Reason (R): In a bolometer the input microwave power causes a change in 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

9. Assertion (A): An ideal rectifier should have unity harmonic factor
Reason (R): An ideal rectifier should have unity displacement factor.
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

10. Assertion (A): Power transistor has lower switching time than SCR
Reason (R): Power transistor has greater switching time than SCR
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

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