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GATE: Electronics MCQs (PracticeTest 1 of 13)
1. Removing bypass capacitor across the emitter leg resistor in a CE amplifier causes
a. increase in current gain
b. decrease in current gain
c. increase in voltage gain
d. decrease in voltage gain
Answer: d
2. The minimum number of flipflops required to construct a mod75 counter is
a. 5
b. 6
c. 7
d. 8
Answer: c
3. The important characteristic of emitterfollower is
a. High input impedance and high output impedance
b. High input impedance and low output impedance
c. Low input impedance and low output impedance
d. Low input impedance and high output impedance
Answer: b
4. When an amplifier is provided with current series feedback, its
a. Input impedance increases and output impedance decreases
b. Input and output impedance both decrease
c. Input impedance decreases and output impedance increases
d. Input and output impedance both increase
Answer: d
5. The frequency of oscillation of a tunnelcollector oscillator having L = 30µH and C = 300pf is nearby
a. 267 kHz
b. 1677 kHz
c. 1.68 kHz
d. 2.67 kHz
Answer: b
6. The control terminal (pin 5) of 555 timer IC is normally connected to ground through a capacitor (0.01µF). This is to
a. Protect the IC from inadvertent application of high voltage
b. Prevent false triggering by noise coupled onto the pin
c. Convert the trigger input to sharp pulse by differentiation
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d. Suppress any negative triggering pulse
Answer: b
7. The fan out of a MOS logic gate is higher than that of TTL gates because of its
a. Low input impedance
b. high output impedance
c. Low output impedance
d. High input impedance
Answer: d
8. The common collector amplifier is also known as
a. Collector follower
b. Base follower
c. Emitter follower
d. Source follower
Answer: c
9. In classA amplifier, the output current flows for
a. A part of the cycle or the input signal
b. The full cycle of the input signal
c. Half the cycle of the input signal
d. 3/4th of the cycle of the input signal
Answer: b
10. In an amplifier with negative feedback
a. Only the gain of the amplifier is affected
b. Only the gain and bandwidth of the amplifier are affected
c. Only the input and output impedance are affected
d. All of the four parameters mentioned above would be affected
Answer: d
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GATE: Electronics MCQs (PracticeTest 2 of 13)
1. Wien bridge oscillator can typically generate frequencies in the range of
a. 1kHz1 Mhz
b. 1 Mhz10MHz
c. 10MHz100MHz
d. 100MHz150MHz
Answer: a
2. A differential amplifier, amplifies
a. and mathematically differentiates the average of the voltages on the two input lines
b. and differentiates the input waveform on one line when the other line is grounded
c. the difference of voltages between the two input lines
d. and differentiates the sum of the two input waveform
Answer: c
3. The type of power amplifier which exhibits crossover distortion in its output is
a. Class A
b. Class B
c. Class AB
d. Class C
Answer: b
4. The lowest output impedance is obtained in case of BJT amplifiers for
a. CB configuration
b. CE configuration
c. CC configuration
d. CE with RE configuration
Answer: c
5. The upper cutoff frequency of an RC coupled amplifier mainly depends upon
a. Coupling Capacitor
b. Emitter bypass capacitor
c. Output capacitance of signal source
d. Interelectrode capacitance and stray shunt capacitance
Answer: d
6. Just as a voltage amplifier amplifies signal voltage, a power amplifier
a. amplifies power
b. amplifies signal current
c. merely converts the signal ac power into the dc power
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d. merely converts the dc power into useful ac power
Answer: d
7. An oscillator of the LC type that has a split capacitor in the circuit is
a. Hartly oscillator
b. Colpitts oscillator
c. Weinbridge oscillator
d. RC phase shift oscillator
Answer: b
8. The function of bleeder resistor in a power supply is
a. the same as that of load resistor
b. to ensure a minimum current drain in the circuit
c. to increase the output dc voltage
d. to increase the output current
Answer: b
9. In a bistable multivibrator circuit, commutating capacitor is used
a. to increase the base storage charge
b. to provide ac coupling
c. to increase the speed of response
d. to provide the speed of oscillations
Answer: c
10. Removing bypass capacitor across the emitterleg resistor in a CE amplifier causes
a. increase in current gain.
b. decrease in current gain.
c. increase in voltage gain.
d. decrease in voltage gain.
Answer: d
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GATE: Electronics MCQs (PracticeTest 3 of 13)
1. Consider the parallel RLC circuit having R = 1, L = 1H, C = 1F. What type of response will the circuit produce?
a. Under damped
b. Over damped
c. Critically damped
d. none of these
Answer: a
2. How much inductance is needed to resonate at 5 kHz with a capacitance of 12nF?
a. 2652 H
b. 11.844 H
c. 3.333 H
d. 84.33 mH
Answer: d
3. The difference between the half power frequencies is called the
a. quality factor
b. resonant frequency
c. bandwidth
d. cutoff frequency
Answer: c
4. A parallel RLC circuit has C = 0.25F & L = 2H. The value of R which will create unity damping factor is
a. 1
b. 2
c. 0.5
d. 4
Answer: b
5. A zero of the transfer function H (s) = 10 (s + 1)/(s + 2) (s + 3) is at
a. 10
b. 1
c. 2
d. 3
Answer: b
6. On the Bode magnitude plot, the slope of the pole 1/(5 + j?) 2 is
a. 20 dB/decade
b. 40 dB/decade
c. 40 dB/decade
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d. 20 dB/decade
Answer: c
7. On the bode phase plot, the slope of [1 + j10ww2/25]^2 is
a. 45° /decade
b. 90° /decade
c. 135° /decade
d. 180° /decade
Answer: d
8. In an electric circuit, the dual of resistance is
a. conductance
b. capacitance
c. open circuit
d. inductance
Answer: a
9. In a series RLC circuit, which of these quality factors has the steepest curve at resonance?
a. Q = 20
b. Q = 12
c. Q = 8
d. Q = 4
Answer: d
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GATE: Electronics MCQs (PracticeTest 4 of 13)
1. The action of JFET in its equivalent circuit can be represented as a
a. Current controlled Current source
b. Current controlled Voltage source
c. Voltage controlled Voltage source
d. Voltage controlled Current source
Answer: d
2. A change in the value of the emitter resistance Re in a differential amplifier
a. affects the difference mode gain Ad
b. affects the common mode gain Ac
c. affects both Ad and Ac
d. does not effect either Ad and Ac
Answer: b
3. Generally, the gain of a transistor amplifier falls at high frequencies due to the
a. Internal Capacitance of the device
b. Coupling capacitor at the input
c. Skin effect
d. Coupling capacitor at the output
Answer: a
4. In a common emitter, unbypassed resistor provides
a. voltage shut feedback
b. current series feedback
c. negative voltage feedback
d. positive current feedback
Answer: c
5. A constant current signal across a parallel RLC circuits gives an o/p of 1.4V at the signal frequency of 3.89kHz. At the frequency of 4 kHz, theo/p voltage will be
a. 1 V
b. 2 V
c. 1.4 V
d. 2.8 V
Answer: b
6. Class AB operation is often used in power (large signal) amplifiers in order to
a. get maximum effeciency
b. Remove even harmonics
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c. Overcome a crossover distortion
d. reducing collector dissipation
Answer: c
7. The bandwidth of an RF tuned amplifier is dependent on
a. Qfactor of the tuned O/P circuit
b. Qfactor of the tuned I/P circuit
c. Quiescent operating point
d. Qfactor of the O/P and I/P circuits as well as quiescent operating point
Answer: a
8. Most of the linear ICs are based on the twotransistor differential amplifier because of its
a. input voltage dependent linear transfer characteristics
b. high voltage gain
c. high input resistance
d. High CMMR
Answer: d
9. Negative feedback in an amplifier
a. Reduces gain
b. Increase frequency and phase distortion
c. Reduces bandwidth
d. Increase Noise
Answer: a
10. A dc power supply has noload voltage of 30V and a fullload voltage of 25V at fullload current of 1A. Its output resistance and load regulationrespectively are
a. 5 ohm & 20%
b. 2 5 ohm & 20%
c. 5 ohm &16.7%
d. 25 ohm & 16.7%
Answer: b
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GATE: Electronics MCQs (PracticeTest 5 of 13)
1. The crawling in an induction motor is caused by
a. improper design of the machine
b. low voltage supply
c. high loads
d. harmonics developed in the motor
Answer: d
2. The speed of an induction motor
a. decreases too much with the increase of load
b. increase with the increase of load
c. decreases slightly with the increase of load
d. remains constant with the increase of load
Answer: c
3. The effect of increasing the length of the air gap in an induction motor will increase
a. power factor
b. speed
c. magnetising current
d. airgap flux
Answer: c
4. the difference between the synchronous speed and the actual speed of an induction motor is known as
a. Regulation
b. back lash
c. slip
d. lag
Answer: c
5. Rotating magnetic field is produced in a
a. singlephase induction motor
b. three phase induction motor
c. dc series motor
d. ac series motor
Answer: b
6. The stator core of the induction motor is made of
a. Laminated cast iron
b. Mild steel
c. Silicon steel stampings
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d. Soft wood
Answer: c
7. Stardelta starter of an induction motor
a. Inserts resistance in rotor circuit
b. Inserts resistance in stator circuit
c. Applies reduced voltage to rotor
d. Applies reduced voltage to stator
Answer: d
8. The starting torque of a 1phase induction motor is
a. High
b. Medium
c. Low
d. Zero
Answer: d
9. The thrust developed by a linear induction motor depends on
a. Synchronous speed
b. Rotor input
c. Number of poles
d. both A and B
Answer: d
10. A 3phase squirrel cage induction motor supplied from a balanced 3phase source drives a mechanical load.
The torquespeed characteristics of the motor (solid curve) and of the load (dotted curve) are shown. Of the two equilibrium points A and B,which of the following options correctly describes the stability of A and B? [GATE 2009]
a. A is stable B is unstable
b. A is unstable B is stable
c. Both are stable
d. Both are unstable
Answer: b
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GATE: Electronics MCQs (PracticeTest 6 of 13)
1. Which of the following amplifier is used in a digital to analog converter?
a. non inverter
b. voltage follower
c. summer
d. difference amplifier
Answer: c
2. Differential amplifiers are used in
a. instrumentation amplifiers
b. voltage followers
c. voltage regulators
d. buffers
Answer: a
3. For an ideal opamp, which of the following is true?
a. The differential voltage across the input terminals is zero
b. The current into the input terminals is zero
c. The current from output terminal is zero
d. The output resistance is zero
Answer: c
4. The two input terminals of an opamp are labeled as
a. High and low
b. Positive and negative
c. Inverting and non inverting
d. Differential ans non differential
Answer: c
5. When a stepinput is given to an opamp integrator, the output will be
a. a ramp.
b. a sinusoidal wave.
c. a rectangular wave.
d. a triangular wave with dc bias.
Answer: a
6. For an opamp having differential gain Av and commonmode gain Ac the CMRR is given by
a. Av + Ac
b. Av/Ac
c. 1 + (Av/Ac)
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d. Ac/Av
Answer: b
7. Hysteresis is desirable in Schmitttrigger, because
a. energy is to be stored/discharged in parasitic capacitances.
b. effects of temperature would be compensated.
c. devices in the circuit should be allowed time for saturation and desaturation.
d. it would prevent noise from causing false triggering.
Answer: c
8. The output voltage Vo of the above circuit is
a. 6V
b. 5V
c. 1.2V
d. 0.2V
Answer: b
9. In the above circuit the current ix is
a. 0.6 A
b. 0.5 A
c. 0.2 A
d. 1/12 A
Answer: b
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GATE: Electronics MCQs (PracticeTest 7 of 13)
1. An ideal OPAMP is an ideal
a. Current controlled Current source
b. Current controlled Voltage source
c. Voltage controlled Voltage source
d. Voltage controlled Current source
Answer: b
2. A 741Type OPAMP has a gainbandwith product of 1MHz. A noninverting amplifier using this opamp & having a voltage gain of 20db willexhibit3db bandwidth of
a. 50KHz
b. 100KHz
c. 1000/17KHz
d. 1000/7.07KHz
Answer: a
3. An amplifier using an opamp with slew rate SR = 1v/sec has a gain of 40db. If this amplifier has to faithfully amplify sinusoidal signals from dcto 20KHz without introducing any slewrate induced distortion, then the input signal level exceed
a. 795mV
b. 395mV
c. 795mV
d. 39.5mV
Answer: c
4. The ideal OPAMP has the following characteristics
a. Ri = ∞ A = ∞ R0 = 0
b. Ri = 0, A = ∞ R0 = 0
c. Ri = ∞ A = ∞ R0 = ∞
d. Ri = 0, A = ∞ R0 = ∞
Answer: b
5. The approximate input impedance of the opamp circuit which has Ri = 10k, Rf = 100k, RL = 10k
a. ∞
b. 120k
c. 110k
d. 10k
Answer: c
6. An opamp has a slew rate of 5V/S. The largest sine wave o/p voltage possible at a frequency of 1MHz is
a. 10 V
b. 5 V
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c. 5V
d. 5/2 V
Answer: a
7. Assume that the opamp of the fig. Is ideal. If Vi is a triangular wave, then V0 will be
a. square wave
b. Triangular wave
c. Parabolic wave
d. Sine wave
8. A differential amplifier is invariably used in the i/p stage of all opamps. This is done basically to provide the opamps with a very high
a. CMMR
b. bandwidth
c. slew rate
d. openloop gain
Answer: c
9. A differential amplifier has a differential gain of 20, 000. CMMR = 80dB. The common mode gain is given by
a. 2
b. 1
c. ½
d. 0
Answer: c
10. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common moderejection ratio is
a. 23dB
b. 25dB
c. 46dB
d. 50dB
Answer: b
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