Ques.71. If ZL = 200Ω and it is desired that Zi = 50Ω. The quarter wave transformer should have a characteristic impedance of
- 100 Ω
- 40 Ω
- 10Ω
- 15 Ω
Ques.72. A broadside array consisting of 200 cm wavelength with half-wave dipole spacing 10 cm. And if each array elements feeding with 1 A current and operating at the same frequency, then find the half power beam width
- 4°
- 2°
- 10°
- 15°
Ques.73. For a given charge difference, the electrostatic field strength varies according to
- Plate potential
- Plate area
- Plate distance
- Dielectric quantity
Ques.74. What is the energy gap?
- The space between two orbitals shells
- The energy equal to the energy acquired by an electric passing a 1V electric field
- The energy band in which electrons can move freely
- An energy level at which an electron can exist
Ques.75. The intrinsic impedance of free space
- Increase with an increase of frequency
- Decrease with the decrease of frequency
- In independent of frequency
- None of these
Ques.76. Which of the following laws of electromagnetic theory is associated with the force experienced by two loops of a wire carrying currents?
- Maxwell’s law
- Coulomb’s law
- Ampere’s law
- Laplace’s law
Ques.77. If every state variable of the process can be controlled infinite time by some input, then the process is called
- Completely controlled
- Uncontrollable
- Completely observable
- Unobservable
Ques.78. A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is
- 1.4 N-s/m
- 18.52 N-s/m
- 52.92 N-s/m
- 529.2 N-s/m
Ques.79. The cam follower generally used in automobile engines is
- Knife edge follower
- Flat faced follower
- Spherical faced follower
- Roller Follower
Ques.80. When the axes of the first and last wheels are coaxial then the trains is known as
- Simple train of wheels
- Compound trains of wheels
- Reverted gear train
- Epicyclic gear train
