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.Management Sciences
Category: Electromagnetism
Galvanometer is a very sensitive device with______________________?
A. very low damping
B. very high damping
C. no damping at all
D. radial field disintegration
While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?
A. a most sensitive galvanometer is used
B. a steady voltage cell is used
C. the balance point is close to the middle of the wire
D. a high resistance box is used in one of its gap
Heating a magnet will ____________________?
A. weaken it
B. strengthen it
C. reverse its polarity
D. demagnetize it completely
In a multi range ammeter as the range increases _____________________?
A. shunt value decreases
B. shunt value increases
C. shunt value remains the same
D. none of the above
Which one of the following is not an electromechanical instrument ?
A. galvanometer
B. voltmeter
C. ammeter
D. AC transformer and DC generator
A magnetic compass will be deflected if it is kept near a____________________?
A. charge in motion
B. charge at rest
C. both
D. none
An ammeter measures the total current flowing through a circuit when it is connected__________________?
A. in series with the circuit
B. in parallel with circuit
C. in series with any of the parallel resistances in the circuit
D. in parallel with any of the series resistances in the circuit
The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?
A. 1T = 103 G
B. 1T = 10-4 G
C. 1T = 10-2 G
D. 1T = 104 G
If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?
A. τ = NIAB cosφ
B. τ = NIAB sinφ
C. τ = NIAB tanφ
D. τ = NIAB
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