
UPSC_Exams > UPSC_Indian_Engineering_Services_Answer > UPSC_IES_EC_2014_Answer_Key_Question_par 1) The correlation function of a widesense stationary random process representing a nondeterministic signal is  A) not a deterministic function  B) deterministic,but not symmetric function  C) sometimes nondeterministic function  D) always deterministic and symmetric function  View Answer   Answer : always deterministic and symmetric function

2) What is an advantage of MOS transistor structure in integrated circuits?  A) Faster switching  B) Less capacitance  C) Higher component density and lower cost  D) Lower resistance  View Answer   Answer : Higher component density and lower cost

3) An LTI system has a widesense stationary (WSS) input signal with zero mean. Its output is  A) nonzero mean and nonWSS signal  B) zero mean and WSS signal  C) nonzero mean and WSS signal  D) zero mean and nonWSS signal  View Answer   Answer : zero mean and WSS signal

4) Which of the following statements are correct in association with the superposition theorem? Select the correct answer using the code given below.  1) It is applicable to networks having more than one source  2) It is used to determine the current in a branch or voltage across branch  3) It is applicable to direct current circuits only  4) It is applicable to networks having linear and bilateral elements  A) 1, 2 and 3  B) 1, 2 and 4  C) 1, 3 and 4  D) 2, 3 and 4  View Answer   Answer : 1, 2 and 4

5) A network N consists of resistors, dependent and independent voltage and current sources. If the current in one particular resistance is 1 A, it will be doubled if the values of all the  A) independent voltage sources are doubled  B) independent current sources are doubled  C) dependent and independent voltage and current sources are doubled  D) independent voltage and current sources are doubled  View Answer   Answer : independent voltage sources are doubled

6) The reactances of a 10 µF capacitor at f = 0 Hz (d.c.) and f = 50 Hz are respectively  A) ? and 318.47 ?  B) 10.0 ? and 318.47 ?  C) ? and 31.84 ?  D) 0.01 ? and 31.84 ?  View Answer   Answer : ? and 318.47 ?

7) Consider the following statements : Any element is redundant if connected in  1) series with an ideal current source  2) parallel with an ideal current source  3) series with an ideal voltage source  4) parallel with an ideal voltage source  A) 1 and 3  B) 1 and 4  C) 2 and 3  D) 2 and 4  View Answer   Answer : 1 and 4

8) Inductive reactance X is a function of inductance L and frequency f The value of X increases when  A) both L and f increase  B) L increases and f decreases  C) both L and f decrease  D) L decreases and f increases  View Answer   Answer : both L and f increase

9) An alternating voltage is given by the equation v = 282.84 sin ( 377t + ^{?}⁄_{6}) What are the value of r.m.s voltage, frequency and time period?  A) 20 V, 60 Hz and 0.0167 s  B) 200 V, 50 Hz and 0.02 s  C) 200 V, 60 Hz and 0.0167 s  D) 20 V, 50 Hz and 0.0167 s  View Answer   Answer : 200 V, 60 Hz and 0.0167 s

10) If a capacitor is energized by a symmetrical squarewave current source, then the steadystate voltage across the capacitor will be  A) a square wave  B) a triangular wave  C) a step function  D) an impulse function  View Answer   Answer : a triangular wave

 