Which one of the following field patterns represents a TEM wave travelling in the positive x direction?
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'B'. Can you explain this answer?

Nirmala Rani answered  •  4 hours ago
For TEM wave
Electric field (E), Magnetic field (H) and
Direction of propagation (P) are orthogonal to each other.
Here P = + ax
By verification
E =-2ay , H  =-3az
E x H=- ay x -a = +ax→ P

Which of the following statement is INCORRECT?
  • a)
    Shear parameters ‘c’ and ∅ vary with drainage conditions of shear test.
  • b)
    Shear parameters ‘c’ and ∅ are independent of water content of soil.Correct Answer
  • c)
    Laboratory vane shear test can also be used to determine liquid limit of silty clay.
  • d)
    Consistency as applied to cohesive soils is an indicator of its shear strength.
Correct answer is option 'B'. Can you explain this answer?

Rajbala Devi answered  •  4 hours ago
Shear parameters ‘c’ and ∅ are dependent of water content of soil
• Vane shear test is a useful method of measuring the shear strength of clay. It is a cheaper and quicker method. The test can also be conducted in the laboratory.
• The laboratory vane shear test for the measurement of shear strength of cohesive soils, is useful for soils of low shear strength (less than 0.3 kg/cm2) for which triaxial or unconfined tests cannot be performed.
• The test gives the undrained strength of the soil. The undisturbed and remoulded strength obtained are useful for evaluating the sensitivity of soil.
NOTE: This test is also useful when the soil is soft and its water content is nearer to the liquid limit.

Consider the following closed loop control system

where If the steady state error for a unit ramp input is 0.1, then the value of K is ______ .
    Correct answer is '30'. Can you explain this answer?

    Mahavir Singh answered  •  4 hours ago
    Open loop transfer function for the system = C(s) x G(s) = 
    Since the system is type-1 so far a given unit ramp input steady state

    where, Kv
    So, 
    Given that, ess = 0.1
    So, 

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