Engineering
Engineering MCQs With Answers
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In an R-L series circuit connected to an AC source, the phase angle theta by which current lags voltage is given by:
Aarccos(R / (omega * L))
Barctan(omega * L / R)
Carcsin(omega * L / R)
Darctan(R / (omega * L))
Double Sideband Suppressed Carrier (DSB-SC) modulation requires what percentage saving in total transmitted power compared to standard AM (m=1)?
A100%
B33.3%
C50.0%
D66.7%
The characteristic impedance of free space (vacuum) for electromagnetic waves is approximately equal to:
A377 Ohms (120 * pi)
B75 Ohms
C300 Ohms
D50 Ohms
In Frequency Modulation (FM), the modulation index beta is defined as the ratio of:
AFrequency deviation to Modulating frequency
BModulating frequency to Carrier frequency
CCarrier amplitude to Modulating amplitude
DBandwidth to Carrier frequency
In Pulse Code Modulation (PCM), the process of converting continuous amplitude samples into discrete levels is called:
AMultiplexing
BSampling
CQuantization
DEncoding
An oscilloscope probe with a 10:1 attenuation factor increases the effective input impedance of the oscilloscope by a factor of:
A0.1
B10
C100
D1
The moving coil in a PMMC (Permanent Magnet Moving Coil) instrument is wound on an aluminum frame to provide:
AFluid friction damping
BHysteresis damping
CAir friction damping
DEddy current damping
The Peak Overshoot M_p of a second-order underdamped system depends solely on:
ASystem gain K
BDamping ratio (zeta)
CNatural frequency (omega_n)
DSettling time (t_s)
Lead Compensator in a control system is used primarily to:
AReduce steady-state error to zero
BDecrease bandwidth
CEliminate high frequency noise
DImprove transient response speed and phase margin
The steady-state error of a Type-1 control system subjected to a unit step input is:
A1 / (1 + K_p)
BZero
CInfinity
D1 / K_v