Electromagnetics Set 1

Electrical Engineering

Practice Mode Next
On This Page

This set of Electromagnetics Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetics Set 1

Q1 | Gradient of a function is a constant. State True/False.
  • true
  • false
Answer: false
Q2 | The mathematical perception of the gradient is said to be
  • tangent
  • chord
  • slope
  • arc
Answer: slope
Q3 | Divergence of gradient of a vector function is equivalent to
  • laplacian operation
  • curl operation
  • double gradient operation
  • null vector
Answer: laplacian operation
Q4 | Curl of gradient of a vector is
  • unity
  • zero
  • null vector
  • depends on the constants of the vector
Answer: null vector
Q5 | Find the gradient of the function given by, x2 + y2 + z2 at (1,1,1)
  • i + j + k
  • 2i + 2j + 2k
  • 2xi + 2yj + 2zk
  • 4xi + 2yj + 4zk
Answer: 2i + 2j + 2k
Q6 | The gradient can be replaced by which of the following?
  • maxwell equation
  • volume integral
  • differential equation
  • surface integral
Answer: differential equation
Q7 | . Find the gradient of the function sin x + cos y.
  • cos x i – sin y j
  • cos x i + sin y j
  • sin x i – cos y j
  • sin x i + cos y j
Answer: cos x i – sin y j
Q8 | The divergence of a vector is a scalar. State True/False.
  • true
  • false
Answer: true
Q9 | The divergence concept can be illustrated using Pascal’s law. State True/False.
  • true
  • false
Answer: true
Q10 | Compute the divergence of the vector xi + yj + zk.
  • 0
  • 1
  • 2
  • 3
Answer: 3
Q11 | Find the divergence of the vector yi + zj + xk.
  • -1
  • 0
  • 1
  • 3
Answer: 0
Q12 | Find the divergence of the vector F= xe-x i + y j – xz k
  • (1 – x)(1 + e-x)
  • (x – 1)(1 + e-x)
  • (1 – x)(1 – e)
  • (x – 1)(1 – e)
Answer: (1 – x)(1 + e-x)
Q13 | Find whether the vector is solenoidal, E = yz i + xz j + xy k
  • yes, solenoidal
  • no, non-solenoidal
  • solenoidal with negative divergence
  • variable divergence
Answer: yes, solenoidal
Q14 | Find the divergence of the field, P = x2yz i + xz k
  • xyz + 2x
  • 2xyz + x
  • xyz + 2z
  • 2xyz + z
Answer: 2xyz + x
Q15 | Identify the nature of the field, if the divergence is zero and curl is also zero.
  • solenoidal, irrotational
  • divergent, rotational
  • solenoidal, irrotational
  • divergent, rotational
Answer: solenoidal, irrotational
Answer: solenoidal, irrotational
Q16 | Curl is defined as the angular velocity at every point of the vector field. State True/False.
  • true
  • false
Answer: true
Q17 | The curl of curl of a vector is given by,
  • div(grad v) – (del)2v
  • grad(div v) – (del)2v
  • (del)2v – div(grad v)
  • (del)2v – grad(div v)
Answer: grad(div v) – (del)2v
Q18 | Which of the following theorem use the curl operation?
  • green’s theorem
  • gauss divergence theorem
  • stoke’s theorem
  • maxwell equation
Answer: stoke’s theorem
Q19 | The curl of a curl of a vector gives a
  • scalar
  • vector
  • zero value
  • non zero value
Answer: vector
Q20 | Is the vector is irrotational. E = yz i + xz j + xy k
  • yes
  • no
Answer: yes
Q21 | Find the curl of A = (y cos ax)i + (y + ex)k
  • 2i – ex j – cos ax k
  • i – ex j – cos ax k
  • 2i – ex j + cos ax k
  • i – ex j + cos ax k
Answer: i – ex j – cos ax k
Q22 | Find the curl of the vector A = yz i + 4xy j + y k
  • xi + j + (4y – z)k
  • xi + yj + (z – 4y)k
  • i + j + (4y – z)k
  • i + yj + (4y – z)k
Answer: i + yj + (4y – z)k
Q23 | Curl cannot be employed in which one of the following?
  • directional coupler
  • magic tee
  • isolator and terminator
  • waveguides
Answer: waveguides
Q24 | Which of the following Maxwell equations use curl operation?
  • maxwell 1st and 2nd equation
  • maxwell 3rd and 4th equation
  • all the four equations
  • none of the equations
Answer: maxwell 1st and 2nd equation
Q25 | The integral form of potential and field relation is given by line integral. State True/False
  • true
  • false
Answer: true
Next