The thickness of insulation provided on the conductor depends on ___________?
A. the magnitude of voltage on the conductor
B. the magnitude of current flowing through it
C. both A. and (b)
D. none of the above
Category: Engineeeing Mcqs
An electric filament bulb can be worked from __________?
A. D. C. supply only
B. A. C. supply only
C. Battery supply only
D. All above
The insulation on a current carrying conductor is provided __________?
A. to prevent leakage of current
B. to prevent shock
C. both of above factors
D. none of above factors
The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is __________?
A. zero
B. negative
C. positive
D. about 2 ohms per degree
Which of the following quantities remain the same in all parts of a series circuit?
A. Voltage
B. Current
C. Power
D. Resistance
A closed switch has a resistance of __________?
A. zero
B. about 50 ohms
C. about 500 ohms
D. infinity
Resistance of a material always decreases if __________?
A. temperature of material is decreased
B. temperature of material is increased
C. number of free electrons available become more
D. none of the above is correct
When electric current passes through a metallic conductor, its temperature rises. This is due to __________?
A. collisions between conduction electrons and atoms
B. the release of conduction electrons from parent atoms
C. mutual collisions between metal atoms
D. mutual collisions between conducting electrons
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as __________?
A. 4 : 25
B. 25 : 4
C. 2 : 5
D. 5 : 2
Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across __________?
A. Rl
B. Ri
C. either Rl or Ri
D. none of them
