Q.1.
Relative permeability of vacuum is
Q.2.
In a magnetic material hysteresis loss takes place primarily due to
Q.3.
Permeability in a magnetic circuit corresponds to_________ in an electric circuit.
Q.4.
The unit for reluctance is
Q.5.
Those materials are well suited for making permanent magnets whichhave______retentivity and _______coercivity.
Q.6.
Point out the wrong statement.Magnetic leakage is undesirable in electric machines because it
Q.7.
Permeability in a magnetic circuit corresponds to______ in an electric circuit.
Q.8.
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
Q.9.
What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?
Q.10.
When a solenoid is activated, the force that moves the plunger is
Q.11.
An electromagnetic field exists only when there is
Q.12.
The direction of a magnetic field within a magnet is
Q.13.
When the north poles of two bar magnets are brought close together, there will be
Q.14.
The ability of a material to remain magnetized after removal of the magnetizing force is known as
Q.15.
The induced voltage across a stationary conductor in a stationary magnetic field is
Q.16.
What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?
Q.17.
The unit for permeability is
Q.18.
A basic one-loop dc generator is rotated atrev/s. How many times each second does the dc output voltage peak (reach maximum)?
Q.19.
When the current through the coil of an electromagnet reverses, the
Q.20.
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density