Top Electrical Engg MCQ - 500+ MCQ
41
The magnetic flux linking a coil having 200 turns is 40 mWb. Calculate the average emf (in V) induced in the coil, if this magnetic flux is reversed in a time of 5 milliseconds.
42
Determine the magnitude of the EMF (in V) induced between the axis of rotation and the rim of the disc, when the disc of diameter 40 cm rotates with an angular velocity of 40 revolutions per second and placed in a magnetic field of 1 T acting parallel to the rotation of the disc.
43
What will happen to the magnetic flux density produced in a material, if the magnetizing force is increased?
44
The transfer function of a system is defined as the ratio of Laplace transform of output to Laplace transform of input assuming:
45
The blocked rotor test of an induction motor is analogous to which test of a transformer?
46
When any one-phase of a 3-phase synchronous motor is short-circuited, the motor ____.
47
What will be the value of current (in A) drawn from the voltage source for the circuit given below?
48
Therefore, C_eq = 10/2 = 5 µF. 60. A Silicon Controlled Rectifier (SCR) is a:
49
Which of the following is the CORRECT expression for the eddy current loss occurring in a material?
50
Calculate the average value of sinusoidal wave cos²θ over a complete cycle.
51
If the synchronous motor, properly synchronized to the supply is running on no load and is having negligible loss then
52
In a thyristor (SCR), the holding current is:
53
A ceiling fan uses
54
This reduces the required plant capacity. 200. What logic gate is represented by the boolean expression 𝒀 = 𝑨 ⋅ 𝑩‾𝒀 ?
55
A permanent magnet moving coil instrument has a coil of dimension 10 mmx 20 mm. The flux density in the air gap is 2x10⁻³ Wb/m² and the spring constant is 0.25×10⁻⁶ Nm/rad. If the current of 10 mA is flowing through the coil, then calculate the number of turns required to produce an angular deflection of 60 degrees.
56
Which distribution system is more reliable?
57
In repulsion motor direction of rotation of motor
58
The wave form of the armature m.m.f. in DC machine is ____.
59
In a Field Effect Transistor (FET), the Pinch-off voltage refers to the gate-to-source voltage at which the:
60
Which of the following is the CORRECT expression of magnetic reluctance?