Related Questions

If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be
A Demagnetization only
B Cross magnetization as well as magnetization
C Cross-magnetization as well as demagnetizing
D Cross magnetization only
_______ brushes are fragile and cause excessive wear of commutator,
A Natural graphite
B Hard carbon
C Electro graphitic
D Metal graphite
The material for commutator brushes is generally
A Mica
B Copper
C Cast iron
D Carbon
The number of brushes in a commutator depends on
A Speed of armature
B Type of winding
C Voltage
D Amount of current to be collected
Pharmacists recently conducted a study with respect to the reasons their customers purchased eye drops to soothe eye dryness. Dry eyes were more frequently experienced by customers who wore contact lenses than by custorners who did not wear contact lenses. The pharmacists concluded that wearing contact lenses, by itself, can cause contact wearers to have dry eyes.
A An inherited condition can cause both weak eyesight and dry eyes
B Physical exertion causes dry eyes in many people who wear contact lenses.
C Most people who have dry eyes do not wear contact lenses.
D Most people who wear contact lenses do not have dry eyes.
The commutator segments are connected to the armature conductors by means of
A Copper lugs
B Resistance wires
C Insulation pads
D Brazing
Two generators are running in parallel. One of the generators may run as motor for which of the following reasons?
A The direction of that generator is reversed
B The speed of that generator is increased
C The field of that generator is weakened
D That generator takes large share of loads
Electrical contact materials used in switches, brushes, relay must possess
A High thermal conductivity and high melting point
B Low thermal conductivity and low melting pointL
C High thermal conductivity and low melting point
D Low thermal conductivity and high melting point
In AC.S.R. Conductors, the insulation between aluminium and steel conductors is
A Insulin
B Bitumen
C Varnish
D No insulation is required
If 4 students are seated on each bench, 3 benches remain vacant. But if 3 students are seated on each bench, 6 students remain standing .What is the number of students in that class?
A 30
B 55
C 60
D 45

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