Voltage dependent resistors are used_____________?
Voltage dependent resistors are used_____________?
A. for inductive circuits
B. to supress surges
C. as heating elements
D. as current stabilizers
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In a lamp load when more than one lamp are switched on the total resistance of the load_____________?
In a lamp load when more than one lamp are switched on the total resistance of the load_____________?
A. increases
B. decreases
C. remains same
D. none of the aboveAn instrument which detects electric current is known as_____________?
An instrument which detects electric current is known as_____________?
A. voltmeter
B. rheostat
C. wattmeter
D. galvanometerA rheostat differs from potentiometer in the respect that it_____________?
A rheostat differs from potentiometer in the respect that it_____________?
A. has lower wattage rating
B. has higher wattage rating
C. has large number of turns
D. offers large number of tapgWhich of the following statement is correct_______________?
Which of the following statement is correct_______________?
A. A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator
B. A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator
C. A semi-conductor is one which con¬ducts only half of the applied voltage
D. A semi-conductor is a material made of alternate layers of conducting material and insulatorAn open resistor, when checked with an ohm-meter reads_____________?
An open resistor, when checked with an ohm-meter reads_____________?
A. zero
B. infinite
C. high but within tolerance
D. low but not zeroThe resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around_______________?
The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around_______________?
A. 1.2 x 10~8 Q-m
B. 1.4 x 10~8 Q-m
C. 1.6 x 10″”8 Q-m
D. 1.8 x 10″8 Q-m