GATE: Electronics MCQs (Practice Test 1 of 13)

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2 GATE: Electronics MCQs (Practice Test 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 2. The minimum number of flip flops required to construct a mod 75 counter is a. 5 b. 6 c. 7 d The important characteristic of emitter follower 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 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 5. The frequency of oscillation of a tunnel collector oscillator having L = 30µH and C = 300pf is nearby a. 267 khz b khz c khz d khz 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

3 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 8. The common collector amplifier is also known as a. Collector follower b. Base follower c. Emitter follower d. Source follower 9. In class A 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 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

4 GATE: Electronics MCQs (Practice Test 2 of 13) 1. Wien bridge oscillator can typically generate frequencies in the range of a. 1kHz 1 Mhz b. 1 Mhz 10MHz c. 10MHz 100MHz d. 100MHz 150MHz 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 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 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 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. Inter electrode capacitance and stray shunt capacitance 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

5 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. R C phase shift oscillator 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 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 10. 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.

6 GATE: Electronics MCQs (Practice Test 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 2. How much inductance is needed to resonate at 5 khz with a capacitance of 12nF? a H b H c H d mh 3. The difference between the half power frequencies is called the a. quality factor b. resonant frequency c. bandwidth d. cutoff frequency 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 A zero of the transfer function H (s) = 10 (s + 1)/(s + 2) (s + 3) is at a. 10 b. 1 c. 2 d 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

7 7. On the bode phase plot, the slope of [1 + j10w w 2 /25]^2 is a. 45 /decade b. 90 /decade c. 135 /decade d. 180 /decade 8. In an electric circuit, the dual of resistance is a. conductance b. capacitance c. open circuit d. inductance 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

8 GATE: Electronics MCQs (Practice Test 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 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 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 4. In a common emitter, unbypassed resistor provides a. voltage shut feedback b. current series feedback c. negative voltage feedback d. positive current feedback 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, the o/p voltage will be a. 1 V b. 2 V c. 1.4 V d. 2.8 V 6. Class AB operation is often used in power (large signal) amplifiers in order to a. get maximum effeciency b. Remove even harmonics

9 7. The bandwidth of an RF tuned amplifier is dependent on a. Q factor of the tuned O/P circuit b. Q factor of the tuned I/P circuit c. Quiescent operating point d. Q factor of the O/P and I/P circuits as well as quiescent operating point 8. Most of the linear ICs are based on the two transistor differential amplifier because of its a. input voltage dependent linear transfer characteristics b. high voltage gain c. high input resistance d. High CMMR 9. Negative feedback in an amplifier a. Reduces gain b. Increase frequency and phase distortion c. Reduces bandwidth d. Increase Noise 10. A dc power supply has no load voltage of 30V and a full load voltage of 25V at full load current of 1A. Its output resistance and load regulation respectively are a. 5 ohm & 20% b. 2 5 ohm & 20% c. 5 ohm &16.7% d. 25 ohm & 16.7%

10 GATE: Electronics MCQs (Practice Test 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 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 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. air gap flux 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 5. Rotating magnetic field is produced in a a. single phase induction motor b. three phase induction motor c. dc series motor d. ac series motor 6. The stator core of the induction motor is made of a. Laminated cast iron b. Mild steel c. Silicon steel stampings

11 7. Star delta 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 8. The starting torque of a 1 phase induction motor is a. High b. Medium c. Low d. Zero 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 10. A 3 phase squirrel cage induction motor supplied from a balanced 3 phase source drives a mechanical load. The torque speed 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

12 GATE: Electronics MCQs (Practice Test 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 2. Differential amplifiers are used in a. instrumentation amplifiers b. voltage followers c. voltage regulators d. buffers 3. For an ideal op amp, 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 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 5. When a step input is given to an op amp integrator, the output will be a. a ramp. b. a sinusoidal wave. c. a rectangular wave. d. a triangular wave with dc bias. 6. For an op amp having differential gain Av and common mode gain Ac the CMRR is given by a. Av + Ac b. Av/Ac c. 1 + (Av/Ac)

13 7. Hysteresis is desirable in Schmitt trigger, 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. 8. The output voltage Vo of the above circuit is a. 6V b. 5V c. 1.2V d. 0.2V 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

14 GATE: Electronics MCQs (Practice Test 7 of 13) 1. An ideal OP AMP is an ideal a. Current controlled Current source b. Current controlled Voltage source c. Voltage controlled Voltage source d. Voltage controlled Current source 2. A 741 Type OP AMP has a gain bandwith product of 1MHz. A non inverting amplifier using this opamp & having a voltage gain of 20db will exhibit 3db bandwidth of a. 50KHz b. 100KHz c. 1000/17KHz d. 1000/7.07KHz 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 dc to 20KHz without introducing any slew rate induced distortion, then the input signal level exceed a. 795mV b. 395mV c. 795mV d. 39.5mV 4. The ideal OP AMP has the following characteristics a. Ri = A = R0 = 0 b. Ri = 0, A = R0 = 0 c. Ri = A = R0 = d. Ri = 0, A = R0 = 5. The approximate input impedance of the opamp circuit which has Ri = 10k, Rf = 100k, RL = 10k a. b. 120k c. 110k d. 10k 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

15 7. Assume that the op amp 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 op amps. This is done basically to provide the op amps with a very high a. CMMR b. bandwidth c. slew rate d. open loop gain 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 In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is a. 23dB b. 25dB c. 46dB d. 50dB

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