Related Questions

The length of a rectangular field F is 3 km greater than the side of a square field M , and the width of field F is 3 km less then the side of field M. If the area of field M is m2 square km, what is the area of field F?
A m2 +6
B 6
C m2 - 6
D m2 +9
A dc servo motor:
A uses a tachometer for speed feedback
B uses a variable dc voltage for speed control
C can provide precise position control
D All of the above
E None of the above
A farmer has two rectangular fields. The larger field has twice the length and four times the width of the smaller field. If the smaller field has area K, then the area of the largest field is greater than the area of the smaller field by what amount?
A 4K
B 6K
C 7K
D 8K
A farmer has two rectangular fields. The larger field has twice the length and four times the width of the smaller field. If the smaller field has area K, then the area of the larger field is greater than the area of the smaller field by what amount ?
A 2K
B 5 K
C 6K
D 7K
Which dc servomotor requires strongest permanent magnet?
A Slotted armature
B Surface wound armature
C Surface wound with stationary rotor
D Either A or B
A moving-coil permanent-magnet instrument can be used as flux meter
A by using a low resistance shunt
B by using a high series resistance
C by eliminating the control springs
D by making control springs of large moment of inertia
A permanent magnet
A attracts some substances and repels others
B attracts all paramagnetic substances and repels others
C attracts only ferromagnetic substances
D attracts ferromagnetic substances and repels all others
The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields
A meter is surrounded by strong magnetic fields
B a soft iron shielding is used
C a plastic shielding is provided
D a shielding of anon-magnetic material is used
A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.
A ammeter
B voltmeter
C flux-meter
D ballistic galvanometer
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
A induction motor torque in field winding
B induction motor torque in damper winding
C eddy current and hysteresis torque in pole faces
D reHetance motor torque due to saliency of the rotor
E all of the above methods

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