MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 77 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A PMMC instrument which take 10 mA at 50mV potential difference maximum. How much resistance is to connect across the instrument such that the instrument can measure (0 to 10) A current? |
| A. | 0.0005 Ω |
| B. | 0.5 Ω |
| C. | 0.05 Ω |
| D. | 0.005 Ω |
| Answer» E. | |
| 2. |
In Hot-wire instruments, the deflections: |
| A. | Directly proportional to I |
| B. | Inversely proportional to I2 |
| C. | Directly proportional to I2 |
| D. | Inversely proportional to I |
| Answer» D. Inversely proportional to I | |
| 3. |
In dynamometer wattmeter the compensation coil |
| A. | Has an equal number of turns of voltage coil and is connected in series with the current coil |
| B. | Has an equal number of turns of the current coil and is connected in series with voltage coil |
| C. | Has an equal number of turns of the current coil and is connected in series with the current coil |
| D. | Has an equal number of turns of voltage coil and is connected in series with voltage coil |
| Answer» C. Has an equal number of turns of the current coil and is connected in series with the current coil | |
| 4. |
How will you test the supply in plug point? |
| A. | Tester |
| B. | Multimeter |
| C. | Voltmeter |
| D. | All option are correct |
| Answer» E. | |
| 5. |
In electrodynamometer type wattmeter, a high non inductive resistance is connected in _________. |
| A. | parallel with fixed coil |
| B. | parallel with moving coil |
| C. | series with moving coil |
| D. | series with fixed coil |
| Answer» D. series with fixed coil | |
| 6. |
Consider the following statements:Sphere gap method of voltage measurement is used1. for measuring r.m.s. value of a high voltage2. for measuring peak value of a high voltage3. as the standard for calibration purposesWhich of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1 and 3 only |
| D. | 1, 2 and 3 |
| Answer» C. 1 and 3 only | |
| 7. |
Alternating current can be measured by |
| A. | Moving iron repulsion type ammeter |
| B. | Permanent magnet type ammeter |
| C. | Electronic voltmeter |
| D. | Indication voltmeter |
| Answer» B. Permanent magnet type ammeter | |
| 8. |
Energy meters fall into the category of: |
| A. | absolute instruments |
| B. | indicating instruments |
| C. | integrating instruments |
| D. | recording instruments |
| Answer» D. recording instruments | |
| 9. |
A current I = 5 + 14.14 sin (314t + 45°) is passed through a centre zero PMMC, hot wire and moving iron instrument, the respective reading are |
| A. | -5, 15, √125 |
| B. | 5, √125, √125 |
| C. | -5, √125, 19.14 |
| D. | 5, 10, 10 |
| Answer» C. -5, √125, 19.14 | |
| 10. |
Electrostatic instruments are suitable for the measurement of: |
| A. | ac and dc voltage |
| B. | ac voltage and current |
| C. | dc voltage and current |
| D. | ac and dc currents |
| Answer» B. ac voltage and current | |
| 11. |
An analog meter never has ______. |
| A. | restraining spring |
| B. | pointer |
| C. | scale |
| D. | ADC and DAC |
| Answer» E. | |
| 12. |
A sinusoidal voltage of amplitude 150 V has been applied to a circuit having a rectifying device that prevents flow of current in one direction and offers a resistance of 15 Ω for the flow of current in the other direction. If hot wire type and PMMC type instruments are connected in this circuit to measure the electric current, their readings would respectively be: |
| A. | 3.18 A and 5 A |
| B. | 5 A and 3.18 A |
| C. | 3.18 A and 5 mA |
| D. | 5 A and 3.18 mA |
| Answer» C. 3.18 A and 5 mA | |
| 13. |
An electrodynamometer type of instruments find its major use as: |
| A. | both, a standard instrument and a transfer instrument |
| B. | a transfer instrument only |
| C. | a standard instrument only |
| D. | a type of indicator instrument |
| Answer» B. a transfer instrument only | |
| 14. |
In the indicating instruments, the control torque produced by the spring is: |
| A. | ∝ θ2 |
| B. | ∝ θ |
| C. | \( \propto \frac{1}{{\rm{\theta }}}\) |
| D. | \( \propto \frac{1}{{{{\rm{\theta }}^2}}}\) |
| Answer» C. \( \propto \frac{1}{{\rm{\theta }}}\) | |
| 15. |
A current i = 5 + 14.14 sin (314 t + 45°) is passed through a center-zero PMMC, hot-wire and moving iron instrument. The respective readings are |
| A. | -5, 15 and √125 |
| B. | 5, √125 and √125 |
| C. | -5, √125 and 19.14 |
| D. | 5, 10 and 10 |
| Answer» C. -5, √125 and 19.14 | |
| 16. |
Assertion (A): A hot wire ammeter has a square of the RMS current.Reason (R): The heat is proportional to the square of the current. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 17. |
M.C. (Moving Coil) and M.I. (Moving Iron) type of instruments can be distinguished by their: |
| A. | Range |
| B. | Size of terminals |
| C. | Pointer |
| D. | Scale |
| Answer» E. | |
| 18. |
A moving coil ammeter can be used to measure: |
| A. | direct and alternating currents |
| B. | low-frequency alternating current |
| C. | DC current |
| D. | high-frequency alternating current |
| Answer» D. high-frequency alternating current | |
| 19. |
Practical voltmeter has: |
| A. | Low resistance |
| B. | High resistance |
| C. | Infinite resistance |
| D. | Zero resistance |
| Answer» C. Infinite resistance | |
| 20. |
Ammeter and voltmeter are connected across the load in _______ and _______ respectively. |
| A. | Series, parallel |
| B. | Parallel, series |
| C. | Series, series |
| D. | Parallel, parallel |
| Answer» B. Parallel, series | |
| 21. |
Find the mean temperature rise of a coil when its resistance is 21 Ω and the surrounding temperature is 15°C. It has a resistance of 18 Ω when its mean temperature is 20°C and of 20 Ω when mean temperature is 50°C. |
| A. | 50°C |
| B. | 40°C |
| C. | 30°C |
| D. | 20°C |
| Answer» B. 40°C | |
| 22. |
Consider the following instruments:1. MI instrument2. Electrostatic instrument3. Electrodynamometer instrumentWhich of the above instruments is/are free from hysteresis and eddy-current losses? |
| A. | 1 only |
| B. | 2 only |
| C. | 3 only |
| D. | 1, 2 and 3 |
| Answer» C. 3 only | |
| 23. |
In induction type voltmeters and ammeters, the instantaneous torque T is: |
| A. | ∝ (φ1i1 + φ2i2) |
| B. | ∝ (φ1i2 - φ2i1) |
| C. | ∝ (φ1i2 + φ2i1) |
| D. | ∝ (φ1i1 - φ2i2) |
| Answer» C. ∝ (φ1i2 + φ2i1) | |
| 24. |
Of what material, swamping resistance is made up? |
| A. | The alloy of nickel and cobalt |
| B. | The alloy of manganese and aluminium |
| C. | Alloy of manganin and copper |
| D. | None of these |
| Answer» D. None of these | |
| 25. |
An ammeter: |
| A. | Is connected in series in a circuit |
| B. | Should have low electrical resistance |
| C. | Absorbs small power |
| D. | All of the above |
| Answer» E. | |
| 26. |
Hot wire instruments have ______. |
| A. | squared scale |
| B. | log scale |
| C. | uniform scale |
| D. | None of the given options |
| Answer» B. log scale | |
| 27. |
Calculate the reading that will be given by a hot-wire voltmeter If it connected across the terminals of a generator whose voltage waveform is represented by:\(v = 400\sin \omega t + 300\sin 2\omega tV\) |
| A. | \(500/\sqrt 2 \;V\) |
| B. | \(300/\sqrt 2 \;V\) |
| C. | \(250/\sqrt 2 \;V\) |
| D. | \(450/\sqrt 2 \;V\) |
| Answer» B. \(300/\sqrt 2 \;V\) | |
| 28. |
A Ballistic galvanometer of constant equal to 1 micro coulomb/degree gives a throw of 22.5°, when a capacitor discharges through the meter. If a battery of 15 V is used to recharge the capacitor, value of capacitance is |
| A. | 22.5 μF |
| B. | 10 μF |
| C. | 1.5 μF |
| D. | 15 μF |
| Answer» D. 15 μF | |
| 29. |
Dynamometer type wattmeter is used for the measurement of: |
| A. | both AC and DC power |
| B. | DC voltage |
| C. | only DC power |
| D. | only AC power |
| Answer» B. DC voltage | |
| 30. |
In PMMC instruments, torque/deflection produced in the coil is _______ current flowing through it. |
| A. | directly proportional |
| B. | inversely proportional |
| C. | directly proportional to the square of |
| D. | inversely proportional to the square of |
| Answer» B. inversely proportional | |
| 31. |
Electrostatic instrument uses the principle of the variation of |
| A. | Capacitance with the current |
| B. | Inductance with the voltage |
| C. | Inductance with the current |
| D. | Capacitance with the voltage |
| Answer» E. | |
| 32. |
Damping torque is essential to |
| A. | Increase oscillation |
| B. | Reduce oscillation |
| C. | Maintain oscillation unchanged |
| D. | None of these |
| Answer» C. Maintain oscillation unchanged | |
| 33. |
In spring control mechanism, the pointer will come to rest at a position when: |
| A. | TC > TD |
| B. | TC < TD |
| C. | TC = TD |
| D. | None of the given options |
| Answer» D. None of the given options | |
| 34. |
Ammeter provides the path for: |
| A. | Maximum voltage |
| B. | Minimum voltage |
| C. | Minimum current |
| D. | Maximum current |
| Answer» E. | |
| 35. |
Assertion (A): Shunt of an ammeter has a low resistanceReason (R): Shunt may be connected in series or in parallel with an ammeter. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true, 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 | |
| 36. |
If the current through the operating coil of a moving iron instrument is doubled, the operating force becomes |
| A. | one and a half times |
| B. | 2 times |
| C. | 3 times |
| D. | 4 times |
| Answer» E. | |
| 37. |
In a single phase dynamometer wattmeter, the instantaneous torque has a component of power which varies as ________ with the frequency of voltage and current. |
| A. | Twice |
| B. | Half |
| C. | Four times |
| D. | Three times |
| Answer» B. Half | |
| 38. |
In Induction wattmeters, the instantaneous value of deflecting torque is _______ voltage under measurement |
| A. | directly proportional |
| B. | inversely proportional |
| C. | directly proportional to the square of |
| D. | inversely proportional to the square of |
| Answer» D. inversely proportional to the square of | |
| 39. |
A meter connected in parallel with a component to measure ___ |
| A. | Voltage |
| B. | Current |
| C. | Power |
| D. | None |
| Answer» B. Current | |
| 40. |
A Voltmeter is which type of instrument? |
| A. | Integrating |
| B. | Recording |
| C. | Indicating |
| D. | None of the given options |
| Answer» D. None of the given options | |
| 41. |
Flux meter uses which of the following effect |
| A. | Magnet effect |
| B. | Induction Effect |
| C. | Hall Effect |
| D. | electrical effect |
| Answer» D. electrical effect | |
| 42. |
Integrating meters are used for the measurement of: |
| A. | Current |
| B. | Phase |
| C. | Energy |
| D. | Voltage |
| Answer» D. Voltage | |
| 43. |
DC probes are generally used with a voltmeter to |
| A. | Decrease its range |
| B. | Increase its range |
| C. | Frequency independent |
| D. | None of these |
| Answer» B. Increase its range | |
| 44. |
A list of different resistor configurations are given below:a) Shunt resistorb) Series multiplexer resistorc) Ayrton shuntd) Swamping resistorWhich of the above are used in DC Ammeter? |
| A. | a and b |
| B. | b and c |
| C. | c and b |
| D. | a and c |
| Answer» E. | |
| 45. |
Hot Wire Instruments read: |
| A. | Peak value |
| B. | Average value |
| C. | R.M.S value |
| D. | None of these |
| Answer» D. None of these | |
| 46. |
In a deflection frequency meter working on the principles of electrical resonance, there are two parallel circuits. Each circuit consists of an inductance and a capacitance in series. One circuit has C1 = 1 μF, R1 = 100 Ω and is tuned to a frequency of f1 = 60 Hz. The other circuit has C2 = 1.5 μF, R2 = 100 Ω and is tuned to a frequency f2. The value of inductance in first circuit will be |
| A. | 3.7 H |
| B. | 7.05 H |
| C. | 11.37 H |
| D. | 11.82 H |
| Answer» C. 11.37 H | |
| 47. |
A shunt is required to extend the range of 1 mA to 10 mA, while meter resistance is 36 ohms. The value of shunt will be |
| A. | 1 Ω |
| B. | 2 Ω |
| C. | 3 Ω |
| D. | 4 Ω |
| Answer» E. | |
| 48. |
Electrical instruments which directly indicate the value of the electrical quantity at the time when it is being measured are called: |
| A. | secondary instruments |
| B. | integrating instruments |
| C. | recording instruments |
| D. | indicating instruments |
| Answer» E. | |
| 49. |
Poynting – vector Wattmeter works on ________ |
| A. | Magnetic Effect |
| B. | Hall Effect |
| C. | Induction Effect |
| D. | Heating Effect |
| Answer» C. Induction Effect | |
| 50. |
For a 1000 micro Amp movement with 100 ohms Rse, its voltage V at full scale deflection is |
| A. | 250 micro Volt |
| B. | 0.1 Volt |
| C. | 0.2 Volt |
| D. | 0.5 Volt |
| Answer» C. 0.2 Volt | |