Questions and answers for exam Preparation

MCQs

Total Questions : 327 | Page 26 of 33 pages

Question 251. In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value__________?

will change the maximum value of current at resonance
will change the resonance frequency
will change the impedance at resonance frequency
will increase the selectivity of the circuit

Discuss Question

Answer: Option D. -> will increase the selectivity of the circuit
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 252. Inductance affects the direct current flow__________?

only at the time of turning off
only at the time of turning on
at the time of turning on and off
at all the time of operation

Discuss Question

Answer: Option C. -> at the time of turning on and off
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 253. In a highly capacitive circuit the__________?

apparent power is equal to the actual power
reactive power is more than the apparent power
reactive power is more than the actual power
actual power is more than its reactive power

Discuss Question

Answer: Option C. -> reactive power is more than the actual power
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 254. Pure inductive circuit____________?

consumes some power on average
does not take power at all from a line
takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
none of the above

Discuss Question

Answer: Option C. -> takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 255. Inductance of a coil Varies__________?

directly as the cross-sectional area of magnetic core
directly as square of number of turns
directly as the permeability of the core
inversely as the length of the iron path
as A. to (d)

Discuss Question

Answer: Option E. -> as A. to (d)
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 256. Power factor of the following circuit will be zero__________?

resistance
inductance
capacitance
both B. and C.

Discuss Question

Answer: Option D. -> both B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 257. Power factor of the system is kept high__________?

to reduce line losses
to maximise the utilization of the capacities of generators, lines and transformers
to reduce voltage regulation of the line
due to all above reasons

Discuss Question

Answer: Option D. -> due to all above reasons
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 258. In a loss-free R-L-C circuit the transient current is__________?