Practice MCQ

Q1: What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?

A. Hysteresis
B. Induction
C. Retentivity
D. Reluctance

Q2: Mutual induction is dependent on

A. winding ratios
B. output polarities
C. DC voltage levels
D. current changes

Q3: What is the name for the distance a radio wave travels during one complete cycle

A. Wave speed
B. Waveform
C. Wavelength
D. Wave spread

Q4: What device increases the low-power output from a hand-held transceiver

A. A voltage divider
B. An RF power amplifier
C. An impedance network
D. A voltage regulator

Q5: What is the name of a device that combines several semiconductors and other components into one package?

A. Transducer
B. Multi-pole relay
C. Integrated circuit
D. Transformer

Q6: Which of these components is made of three layers of semiconductor material?

A. Alternator
B. Bipolar junction transistor
C. Triode
D. Pentagrid converter

Q7: What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?

A. 10 volts
B. 1 volt
C. 11 volts
D. 9 volts

Q8: What is the purpose of the squelch control on a transceiver?

A. To set the highest level of volume desired
B. To set the transmitter power level
C. To adjust the automatic gain control
D. To mute receiver output noise when no signal is being received

Q9: What circuit is used to process signals from the RF amplifier and local oscillator and send the result to the IF filter in a super-heterodyne receiver?

A. Balanced modulator
B. IF amplifier
C. Mixer
D. Detector

Q10: What type of bias is required for an LED to emit light?

A. Reverse bias
B. Forward bias
C. Zero bias
D. none of the above

Q11: How fast does a radio wave travel through free space?

A. at the speed of light
B. At the speed of sound
C. Its speed is inversely proportional to its wavelength
D. Its speed increases as the frequency increases

Q12: How does the wavelength related to frequency?

A. Wavelength and frequency are inversely proportional
B. The wavelength gets longer as the frequency increases
C. here is no relationship between wavelength and frequency
D. The wavelength depends on the bandwidth of the signal

Q13: How many milliamperes is 1.5 amperes?

A. 15 milliamperes
B. 150 milliamperes
C. 1500 milliamperes
D. 15000 milliamperes

Q14: What is the primary advantage of single sideband over FM

A. SSB signals are less susceptible to interference
B. SSB signals are easier to tune
C. SSB signals have narrower bandwidth
D. All the above options are correct

Q15: A coaxial feed-line is constructed from

A. a single conductor
B. two parallel conductors separated by spacers
C. braid and insulation around a central conductor
D. braid and insulation twisted together

Q16: Which of the following types of emission has the narrowest bandwidth?

A. FM voice
B. SSB voice
C. CW
D. Slow-scan TV

Q17: Which of the following electronic components can amplify signals?

A. Transistor
B. Variable resistor
C. Electrolytic capacitor
D. Diode

Q18: Best VHF antenna with high gain

A. Dipole
B. Log periodic
C. Yagi
D. none of the above

Q19: What are the names of the two electrodes of a diode?

A. Plus and minus
B. Source and drain
C. anode and cathode
D. Base and emitter

Q20: How much power is being applied in a circuit when the applied voltage is 13.8 volts DC and current is 10A

A. 138 Watts
B. 0.7 Watts
C. 1.38watts
D. 3.8watts

Q21: What is the resistance of a circuit that draws 4A from a 12-volt source?

A. 3 ohms
B. 16 ohms
C. 48ohms
D. 8 ohms

Q22: Which of the following does not change in a transformer?

A. Current
B. Voltage
C. Frequency
D. all of these

Q23: A transformer core is laminated to

A. reduce hysteresis loss
B. reduce eddy current losses
C. reduce copper losses
D. none of these

Q24: Express the gain of an amplifier in dBm when output power of it is 100mW

A. 10dBm
B. 20 dBm
C. 40 dBm
D. 0 dBm

Q25: The primery advantage of a crystal oscillator is that

A. it can oscillate at any frequency
B. it would give high output voltage
C. its frequency of oscillation remains almost constant
D. it operates on low dc supply voltage

Q26: The intrinsic semiconductor at the absolutezreo of temperature

A. behaves like an insulator
B. has a large number of electrons
C. has large number of holes
D. behaves like a metalic conductor

Q27: For sustaining oscillations in an oscillator

A. feed back factor should be unity
B. phase shift should be zero deg.
C. feed back should be negative
D. both a&b

Q28: An inductor opposes

A. an increase in applied voltage
B. an increase in current flow
C. a decrease in current flow
D. both a&b

Q29: In a fullwave rectifier the current in each of the diode flows for

A. The complete cycle of the input signal
B. Half cycle of the input signal
C. Less than half cycle of the input signal
D. Zero time

Q30: In the process of modulation in the communication system

A. signal frequency is more than thecarrier frequency
B. signal frequency is less than the carrier frequency
C. signal frequency will be directly transmitted
D. signal frequency equals carrier frequency

Q31: The output signal of a detector in a communication receiver is in

A. audio frequency range
B. radio frequency range
C. intermediate frequency range
D. none of the above

Q32: In a radio receiver the selectivity will be governed by

A. Detector
B. Intermediate frequency
C. Audio frequency
D. Beat frequency

Q33: The e.m.f of a cell depends on

A. nature of electrods and elctrolyte
B. size of electrodes
C. spacing between electrodes
D. none of the above

Q34: The mutual inductance (M) between two coils of self inductance L1 and L2 is expressed as

A. M=√L1L2
B. M=1/√L1L2
C. M=K/√L1L2
D. none of the above

Q35: The SI unit of resitivity is

A. Ohm-m
B. Ohm/m
C. Mho-m
D. Mho/m

Q36: The capacitance of a capacitor is not influenced by

A. Plate thickness
B. Plate area
C. Plate separation
D. Nature of dielectric

Q37: A signal (fm) is amplitude modulated with a carrier (fc) then thefrequency of the lower side band is

A. fm-fc
B. fm+fc
C. fc-fm
D. fc+fm

Q38: The highest frequency that is reflected by an inosphere layer is

A. a maximum usable frequency
B. crtical frequency
C. carrier frequency
D. all of the above

Q39: Two resistors are in parallel Resistor A carries twice the current of Resistor B implies that

A. A has the half resistance of B
B. B has the half resistance of A
C. The voltage across A is twice that of across B
D. The voltage across B ts twice acrossA

Q40: SSB transmissions

A. Occupy about the twice he bandwidth of AM transmission
B. Contains more informations tan AM transmission
C. Occcupy about half the bandwidth of AM transmission
D. are compatiable with FM transmission

Q41: The polarization of an electrmagnetic wave is defined by the direction of

A. The H field
B. Propagation
C. The E field
D. The receiving antenna

Q42: A BJT is said to be operating in the saturation region if

A. Both junctions are reversed biased
B. Both the junctions are forward biased
C. Base emitter junction is reverse biased
D. Base collector junction is forward biased

Q43: As per Krichhoff's voltage law- in a closed circuit

A. All the branch voltage meets at a node shoudbe zero
B. All branch currents meets at anode should be zero
C. The sum of all voltage drops is equal to the applied voltage
D. The sum of all the current drops is equal to thr applied current

Q44: In a power supply the point where the diode stops conducting is called

A. Cut off point
B. Cut out point
C. Cut in point
D. No cut point

Q45: The half wave rectifier is suitable only for

A. Charging battaries
B. Running car radios
C. Running AC motors
D. Running CD drives

Q46: In a center tap full wave rectifier 100V is the peak voltage between the center tap and one end of the secondary. The maximum voltage across the reverse biased diode is

A. 200V
B. 141.4V
C. 220V
D. 86V

Q47: Anamplifier with a gain of 30dB has a minus 10 dB attunator connected in cascade. The gain of the combination is

A. 8dB
B. 20dB
C. 40dB
D. 10dB

Q48: The impedance of a resonance circuit is

A. Zero
B. Equal to the resistance
C. Equal to the inductance
D. Unity

Q49: The image ferquency of a super heterodyne receiver is

A. Due to insufficient adjecent channel rejection
B. Not rejected by the tuned IF circuits
C. Created with in the receiver itself
D. Independent of the frequency to which the receiver is tuned

Q50: A transistor is a

A. Current controlled current device
B. Current controlled voltage device
C. Voltage controlled current device
D. Voltage controlled voltage device

Question Pool-2 - Restricted Grade

SECTION: A: Radio Theory

Model question pool-2