Correct Answer:- Option-B
Question29:-A coil has a resistance of 25 ohm and inductance of 5H is connected to a DC source of 50V is suddenly switched
off what will be the value of current at the time of switching off
A:-2A
B:-10A
:-1.962,
D:-0.5A
Correct Answer:- Option-A
Question30:-The inductive reactance of an inductor in a DC circuit is
ரோட்‌
B:-Zero
2-0
0:-०
Correct Answer:- Option-B
Question31:-In a circuit element if the p.d is higher than the applied voltage of the source then it will be
A:-DC circuit
B:-Neither ac nor de circuit
C:-AC circuit
D:-For both circuit
Correct Answer:- Option-C
Question32:-The moving system of an indicating type of electrical instrument is subjected to
A:-A deflecting torque
-Controlling torque
C:-Damping torque
D:-All the above
Correct Answer:- Option-D
Question33:-The most efficient damping employed in electrical instrument is
A--Air friction
B:-Fluid friction
C:-Eddy current
D:-None of the above
Correct Answer:- Option-C
Question34:-In thermocouple ammeter the heat produced is proportional to
A:-Current
-Square root of current
C:-square of current
D:-voltage
Correct Answer:- Option-C
Question35:-In a cross coil megger ,when two currents are passing through them The torque acting up on the coil
A:-opposite direction
B:-same direction
C:-Tan®
D:-none of the above
Correct Answer:- Option-A
Question36:-The frequency error in induction type ammeter is compensated by
A:-Self compensated
-not required
C:-non inductive shunt
D:-inductive shunt
Correct Answer:- Option-C
Question37:-An induction watt meter consist of
A:-series electromagnet
B:-shunt electromagnet
C:-permanent magnet
D:-series and shunt electromagnet
Correct Answer:- Option-D
Question38:-The efficiency of a solar cell is
A:-High
B:-Very high