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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 5901. |
In a sequential circuit the output at any instant depends on |
| A. | present inputs only |
| B. | past inputs only |
| C. | past outputs only |
| D. | past output and present input |
| Answer» E. | |
| 5902. |
For a NAND SR latch of input is the normal resting state of inputs is |
| A. | S = R = 1 |
| B. | S = 0, R = 1 |
| C. | S = 1, R = 0 |
| D. | S = R = 0 |
| Answer» B. S = 0, R = 1 | |
| 5903. |
Assertion (A): The carry look ahead adder is very fast Reason (R): The carry look ahead adder generates the carry and sum digits directly. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is true, R is false |
| D. | A is false, R is true |
| Answer» D. A is false, R is true | |
| 5904. |
If one wants to design a binary counter, preferred type of flip-flop is |
| A. | D-type |
| B. | SR type |
| C. | Latch |
| D. | JK type |
| Answer» B. SR type | |
| 5905. |
Assertion (A): A presettable counter can be preset to any desired starting pointReason (R): The maximum frequency of a ripple counter depends on the modulus. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is true, R is false |
| D. | A is false, R is true |
| Answer» C. A is true, R is false | |
| 5906. |
An 8 bit data is to be entered into a parallel in register. The number of clock pulses required is |
| A. | 8 |
| B. | 4 |
| C. | 2 |
| D. | 1 |
| Answer» E. | |
| 5907. |
Photoelectric emitters in photo tubes are generally made of |
| A. | alkali metals |
| B. | metals |
| C. | semiconductors |
| D. | metal and semiconductors |
| Answer» B. metals | |
| 5908. |
Before doping the semiconductor material is |
| A. | dehydrated |
| B. | heated |
| C. | hardened |
| D. | purified |
| Answer» E. | |
| 5909. |
Due to the formation of Schottky defects the density of the crystal |
| A. | increases slightly |
| B. | increases appreciably |
| C. | decreases slightly |
| D. | decreases appreciably |
| Answer» D. decreases appreciably | |
| 5910. |
The equivalent circuit of an ideal diode is |
| A. | a charging condenser |
| B. | a discharging condenser |
| C. | a switch |
| D. | a resistor |
| Answer» D. a resistor | |
| 5911. |
Piezoelectric quartz crystal resonators find application where |
| A. | signal amplification is required |
| B. | rectification of the signal is required |
| C. | signal frequency control is required |
| D. | modulation of signal is required |
| Answer» C. signal frequency control is required | |
| 5912. |
The number of protons in a silicon atom is |
| A. | 32 |
| B. | 28 |
| C. | 14 |
| D. | 4 |
| Answer» D. 4 | |
| 5913. |
Each cell of a static Random Access memory contains |
| A. | 6 MOS transistor |
| B. | 4 MOS transistor, 2 capacitor |
| C. | 2 MOS transistor, 4 capacitor |
| D. | 1 MOS transistor and 1 capacitor |
| Answer» B. 4 MOS transistor, 2 capacitor | |
| 5914. |
For an RLC series circuit Z(s) is of the form |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-254-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-254-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-254-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-254-4.png"> |
| Answer» E. | |
| 5915. |
If feedback factor is the overall gain of a closed loop system is approximately equal to |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/32-344-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/32-344-2.png"> |
| C. | |
| D. | <span class="root"> </span> |
| Answer» C. | |
| 5916. |
For the given figure C(s)/R(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-86-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-86-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-86-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-86-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-86-3.png"> | |
| 5917. |
For quadratic factor. In Bode log magnitude plot the high frequency asymptote is a straight line having the slope |
| A. | -20 dB per decade |
| B. | +20 dB per decade |
| C. | -40 dB per decade |
| D. | +40 dB per decade |
| Answer» D. +40 dB per decade | |
| 5918. |
For op-amp circuit of the given figure, Eo(s)/Ei(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-74-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-74-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-74-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-74-4.png"> |
| Answer» E. | |
| 5919. |
For a quadratic factor in transfer function the phase angle is not a function of damping factor. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5920. |
The current rating of dc tachogenerator is usually |
| A. | small |
| B. | high |
| C. | medium |
| D. | either (b) or (c) |
| Answer» B. high | |
| 5921. |
Assertion (A): When the phase margin of a control system is improved using a lead network, noise transmission increases.Reason (R): Phase lead compensation increases bandwidth. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» B. Both A and R are correct but R is not correct explanation of A | |
| 5922. |
In liquid flow system the capacitance of a water tank is defined as |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/11-14-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/11-14-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/11-14-3.png"> |
| D. | none of the above |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/11-14-2.png"> | |
| 5923. |
The functions and have |
| A. | identical magnitude and phase curves |
| B. | identical magnitude curves but different phase curves |
| C. | different magnitude curves but identical phase curves |
| D. | different magnitude and phase curves |
| Answer» C. different magnitude curves but identical phase curves | |
| 5924. |
For a second order system, the position of poles is in the shaded region shown in the given figure. The variation in damping factor is |
| A. | from 0 to 1 |
| B. | from about 0.3 to 0.7 |
| C. | from 1 to 5 |
| D. | from 0 to 3 |
| Answer» C. from 1 to 5 | |
| 5925. |
For the second order system having following differential equation(When 0 and i are output and input) the natural frequency is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-241-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-241-2.png"> |
| C. | <span class="root">KJ</span> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-241-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-241-2.png"> | |
| 5926. |
For the op-amp circuit of the given figure, Eo(s)/Ei(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-75-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-75-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-75-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-75-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-75-3.png"> | |
| 5927. |
A unity feedback system has open loop transfer function The closed loop transfer function is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-56-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-56-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-56-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-56-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-56-4.png"> | |
| 5928. |
For a factor in the transfer function, the log magnitude plot |
| A. | is a straight line with slope 0 dB/decade |
| B. | is a straight line with slope 20 dB/decade |
| C. | is a straight line with slope - 20 dB/decade |
| D. | is a straight line with slope - 40 dB/decade |
| Answer» E. | |
| 5929. |
The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5930. |
In control systems the magnitude of error voltage |
| A. | is very small |
| B. | is very large |
| C. | neither small nor large |
| D. | may be any value from 0 to 50 V |
| Answer» B. is very large | |
| 5931. |
The primary function of lag compensator is to provide sufficient |
| A. | gain margin |
| B. | phase margin |
| C. | both gain margin and phase margin |
| D. | either (a) or (b) |
| Answer» C. both gain margin and phase margin | |
| 5932. |
In the given figure, C(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/29-288-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/29-288-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/29-288-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/29-288-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/29-288-3.png"> | |
| 5933. |
In a second order system, the time constant t of exponential envelopes depends |
| A. | only on damping factor |
| B. | only on natural frequency |
| C. | both on damping factor and natural frequency |
| D. | neither on damping factor nor on natural frequency |
| Answer» D. neither on damping factor nor on natural frequency | |
| 5934. |
The network of the given figure is a |
| A. | lag network |
| B. | lead network |
| C. | lag-lead network |
| D. | any of the above |
| Answer» C. lag-lead network | |
| 5935. |
For the given figure |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-45-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-45-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-45-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-45-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-45-4.png"> | |
| 5936. |
The resistance R of a liquid flow system is defined as |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/11-13-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/11-13-2.png"> |
| C. | change in level difference x change in flow rate |
| D. | non of the above |
| Answer» C. change in level difference x change in flow rate | |
| 5937. |
For the given figure C(s)/R(s) |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-46-1u.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-46-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-46-3.png"> |
| D. | none of the above |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-46-2.png"> | |
| 5938. |
The transfer function can be for |
| A. | lead compensator |
| B. | lag compensator |
| C. | lead-lag compensator |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 5939. |
A system with transfer function may be approximated by the system |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-234-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-234-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-234-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-234-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-234-2.png"> | |
| 5940. |
The system of the given figure |
| A. | has two poles and one zero in left half plane |
| B. | has two poles and one zero in right half plane |
| C. | has two poles in left half plane and zero in right half plane |
| D. | none of the above |
| Answer» D. none of the above | |
| 5941. |
The transfer function has the characteristics of high pass filter. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5942. |
The slope of log-magnitude asymptote changes by - 40 dB/ decade at a frequency 1. This means that |
| A. | a double pole is present |
| B. | a pair of complex conjugate poles is present |
| C. | either a double pole or a pair of complex conjugate poles is present |
| D. | a pole or zero at origin is present |
| Answer» D. a pole or zero at origin is present | |
| 5943. |
In the given figure the transfer function |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-238-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-238-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-238-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-238-4.png"> |
| Answer» E. | |
| 5944. |
If the Nyquist plot does not encircle the (-1 + j0) point the system is always stable. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5945. |
In op-amp circuit of the given figure, Eo(s)/Ei(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-73-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-73-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-73-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-73-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-73-2.png"> | |
| 5946. |
Assertion (A): Positive feedback is not used in any circuit.Reason (R): Positive feedback leads to instability. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» E. | |
| 5947. |
The transient response of a second order system is given by for 5% criterion the settling time is |
| A. | 0.25 sec |
| B. | 0.75 sec |
| C. | 1.25 sec |
| D. | 4 sec |
| Answer» C. 1.25 sec | |
| 5948. |
The polar plot of a transfer function passes through (-1, 0) point. The gain margin is |
| A. | zero |
| B. | - 1 dB |
| C. | 1 dB |
| D. | infinity |
| Answer» B. - 1 dB | |
| 5949. |
A system hasFor unit step input the settling time for 2% tolerance band is |
| A. | 1.6 |
| B. | 2.5 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 5950. |
A 20 m antenna gives a certain uplink gain at frequencies of 4/6 GHz. For getting same gain in the 20/30 GHz band, antenna size required is metre. |
| A. | 100 |
| B. | 4 |
| C. | 1 |
| D. | 10 |
| Answer» C. 1 | |