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Home⇒ Engineering⇒
Measurements and instrumentation
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q1 ⇒ Which of these has a magnetic brake? Energy meter [other wrong options] [Discuss in forum] Thermocouple ammeter Dynamometer wattmeter Frequency meter |
Q2 ⇒ The volt ratio box is basically a potential divider [other wrong options] [Discuss in forum] current transformer a high resistance voltmeter either (a) or (c) |
Q3 ⇒ A meter has a square law scale. For 2 A current the deflection in 90°. For a deflection of 45°, the current is 1.414 A [other wrong options] [Discuss in forum] 0.0416666666666667 1.5 A 1.61 A |
Q4 ⇒ It is required that a strain gauge has gauge factor of 100. The proper strain gauge is semiconductor strain gauge [other wrong options] [Discuss in forum] constantan strain gauge nichrome strain gauge alloy strain gauge |
Q5 ⇒ Two ammeters A and B both 0-10 A have internal resistance of 1 Ω and 0.5 Ω respectively. They are connected in parallel. If total current is 15 A, then IA = 5 A, IB = 10 A [other wrong options] [Discuss in forum] IA = IB = 7.5 A IA = 10 A, IB = 5 A IA = 9 A, IB = 6 A |
Q6 ⇒ Assertion (A): In hot wire instrument the material of hot wire in generally platinum iridium. Reason (R): A hot wire ammeter is suitable for ac only A is true R is false [other wrong options] [Discuss in forum] Both A and R are true and R is correct explanation of A Both A and R are true but R is not correct explanation of A A is false R is true |
Q7 ⇒ Two ammeters A and B are connected in parallel in a circuit carrying 100 A. Their resistances are 0.8 mΩ. Their readings will be. 55.56 and 44.44 A respectively [other wrong options] [Discuss in forum] 44.44 A and 55.56 A respectively 60 A and 40 A respectively 40 A and 60 A respectively |
Q8 ⇒ A variable reluctance type tachometer has 150 teeth on rotor. The counter records 13500 pulse/sec. The rotational speed is 5400 RPM [other wrong options] [Discuss in forum] 4800 RPM 6000 RPM 7200 RPM |
Q9 ⇒ It is required to study transients during switching process. Which CRO should be preferred? Storage oscilloscope [other wrong options] [Discuss in forum] Ordinary CRO Dual beam CRO Dual trace CRO |
Q10 ⇒ Consider the following statements
1, 2 and 4 [other wrong options] [Discuss in forum] 1 and 2 3 and 4 1, 2, 3, 4 |
Q11 ⇒ Magnetic deflection is inversely proportional to (voltage)0.5 [other wrong options] [Discuss in forum] voltage (voltage)1.5 (voltage)2 |
Q12 ⇒ A temperature sensistive transducer is subjected to sudden temperature change. It takes 10 seconds for transducer to reach equilibrium condition (five times time constant). The time taken to reach half of temperature difference will be 1.38 s [other wrong options] [Discuss in forum] 5 s 8.62 s 0.9 s |
Q13 ⇒ The function of shunt in an ammeter is to by pass the current [other wrong options] [Discuss in forum] increase sensitivity of meter increase resistance of meter all of the above |
Q14 ⇒ Assertion (A): De sauty's bridge is suitable only for pure capacitor. Reason (R): Capacitors are mostly perfect. A is true R is false [other wrong options] [Discuss in forum] Both A and R are true and R is correct explanation of A Both A and R are true but R is not correct explanation of A A is false R is true |
Q15 ⇒ To avoid creep in an energy meter two holes are cut in the disc on opposite sides of spindle [other wrong options] [Discuss in forum] two shading bands are put on shunt magnet two shading bands are put on series magnet the potential coil is made of very thin wire |
Q16 ⇒ Two resistors R1 = 36 Ω ± 5% and R2 = 75 Ω ± 5% are connected in series. The total resistance is 111 ± 5.55 Ω [other wrong options] [Discuss in forum] 111 ± 0 Ω 111 ± 2.778 Ω 111 ± 7.23 Ω |
Q17 ⇒ A moving coil meter has a resistance of 50 ohms and a full scale deflection current of 20 mA. To convert it into a voltmeter of 0-100 V range, the series resistance should be 4950 Ω [other wrong options] [Discuss in forum] 5000 Ω 5050 Ω 505 Ω |
Q18 ⇒ A meter with a resistance of 100 Ω and a full scale deflection of current of 1 mA is to be converted into voltmeter of 0 - 5 V range. The multiplier resistance should be 4900 Ω [other wrong options] [Discuss in forum] 490 Ω 5000 Ω 5100 Ω |
Q19 ⇒ Hay's bridge is suitable for inductances having low L/R ratio. FALSE [other wrong options] [Discuss in forum] TRUE |
Q20 ⇒ A digital frequency counter can be converted to DVM by addition of a suitable D/A converter [other wrong options] [Discuss in forum] voltage controlled oscillator power amplifier operational amplifier |
Or |