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WorksheetsFuse
Total questions: 10
Worksheet time: 5mins
The primary function of a fuse is to
Open the circuit
Protect the appliance
Protect the line
Prevent excessive currents from flow through the circuit
The fuse rating is expressed in terms of
Current
Voltage
VAR
KVA
Fuses have got advantages of
Cheapest type of protection
Inverse time current characteristic
No Maintenance
Current limiting effect under short-circuit conditions
All of the above
Fusing factor should be
Equal to zero
Less than now
Equal to one
More than one
Fuses can serve upto a current of
25 A
50 A
75 A
100 A
Which among these is the least expensive protection for over current in low voltage system?
Rewirable fuse.
Isolator.
Circuit breaker.
Air breaker switch.
For a current upto 10A which material is used as the fusing element?
Copper
Silver
Alloy of lead and tin
Zinc
H.R.C. fuses has
High rating of current
High rupturing capacity
High resistance capacity
None of these
On which off the following effects of electric current a fuse operates?
Photoelectric effect
Electrostatic effect
Heating effect
Magnetic effect
A fuse in a motor circuit provides protection against
Overload
Short-circuit and overload
Open circuit, short-circuit and overload
None of the above
