Test: Gradient


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10 Questions MCQ Test Electromagnetic Fields Theory (EMFT) | Test: Gradient

Test: Gradient for Electrical Engineering (EE) 2023 is part of Electromagnetic Fields Theory (EMFT) preparation. The Test: Gradient questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Gradient MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Gradient below.
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Test: Gradient - Question 1

Gradient of a function is a constant. State True/False.

Detailed Solution for Test: Gradient - Question 1

Answer: b
Explanation: Gradient of any scalar function may be defined as a vector. The vector’s magnitude and direction are those of the maximum space rate of change of φ.

Test: Gradient - Question 2

The mathematical perception of the gradient is said to be

Detailed Solution for Test: Gradient - Question 2

Answer: c
Explanation: The gradient is the rate of change of space of flux in electromagnetics. This is analogous to the slope in mathematics.

Test: Gradient - Question 3

Divergence of gradient of a vector function is equivalent to

Detailed Solution for Test: Gradient - Question 3

Answer: a
Explanation: Div (Grad V) = (Del)2V, which is the Laplacian operation. A function is said to be harmonic in nature, when its Laplacian tends to zero.

Test: Gradient - Question 4

4. The gradient of xi + yj + zk is

Detailed Solution for Test: Gradient - Question 4

Answer: d
Explanation: Grad (xi + yj + zk) = 1 + 1 + 1 = 3. In other words, the gradient of any position vector is 3.

Test: Gradient - Question 5

Find the gradient of t = x2y+ ez at the point p(1,5,-2)

Detailed Solution for Test: Gradient - Question 5

Answer: b
Explanation: Grad(t) = 2xy i + x2 j + ez k. On substituting p(1,5,-2), we get 10i + j + 0.135k

Test: Gradient - Question 6

Curl of gradient of a vector is

Detailed Solution for Test: Gradient - Question 6

Explanation: Gradient of any function leads to a vector. Similarly curl of that vector gives another vector, which is always zero for all constants of the vector. A zero value in vector is always termed as null vector(not simply a zero).

Test: Gradient - Question 7

Find the gradient of the function given by, x2 + y2 + z2 at (1,1,1)

Detailed Solution for Test: Gradient - Question 7

Answer: b
Explanation: Grad(x2+y2+z2) = 2xi + 2yj + 2zk. Put x=1, y=1, z=1, the gradient will be 2i + 2j + 2k.

Test: Gradient - Question 8

The gradient can be replaced by which of the following?

Detailed Solution for Test: Gradient - Question 8

Answer: c
Explanation: Since gradient is the maximum space rate of change of flux, it can be replaced by differential equations.

Test: Gradient - Question 9

When gradient of a function is zero, the function lies parallel to the x-axis. State True/False. 

Detailed Solution for Test: Gradient - Question 9

Answer: a
Explanation: Gradient of a function is zero implies slope is zero. When slope is zero, the function will be parallel to x-axis or y value is constant.

Test: Gradient - Question 10

 Find the gradient of the function sin x + cos y.

Detailed Solution for Test: Gradient - Question 10

Grad (sin x + cos y) gives partial differentiation of sin x+ cos y with respect to x and partial differentiation of sin x + cos y with respect to y and similarly with respect to z. This gives cos x i – sin y j + 0 k = cos x i – sin y j.

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