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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. |
Q21 ⇒ Thermistors are made of tintered mixture of metallic oxides [other wrong options] [Discuss in forum] pure metals pure insulators pure semiconductors |
Q22 ⇒ A dynamometer wattmeter is connected in ac circuit. The measured power is average power [other wrong options] [Discuss in forum] rms power peak power instantaneous power |
Q23 ⇒ An instrument of accuracy class 1 can have an error equal to ± 1% of full scale deflection [other wrong options] [Discuss in forum] + 1% of reading ± 1% of reading + 1% of full scale deflection |
Q24 ⇒ The resistance of a 125 Ω strain gauge changes by 1 ohm for 4000 micro strain. The gauge factor is 2 [other wrong options] [Discuss in forum] 1.5 2.5 3 |
Q25 ⇒ Assertion (A): Hay's bridge in particularly suitable for measuring inductance having a comparatively low resistance. Reason (R): In Hay's bridge the value of frequency supply must be known. Both A and R are true but R is not correct explanation of A [other wrong options] [Discuss in forum] Both A and R are true and R is correct explanation of A A is true R is false A is false R is true |
Q26 ⇒ The dimensions of EMF are ML2I-1T-3 [other wrong options] [Discuss in forum] M-1T-3 ML2I-2T-3 ML3I-1T-3 |
Q27 ⇒ The two pressure coils in a single phase power factor meter of turns the same dimension and the same numbers of turns [other wrong options] [Discuss in forum] the same dimension but different number of turns different dimension and different numbers of turns different dimension but the same numbers of turns |
Q28 ⇒ A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make 2400 revolutions [other wrong options] [Discuss in forum] 1200 revolutions 1800 revolutions 2100 revolutions |
Q29 ⇒ In 3 phase power measurement by two wattmeter method, both wattmeters had equal reading. The power factor of load is 1 [other wrong options] [Discuss in forum] 0.5 lagging 0.5 leading 0 |
Q30 ⇒ In a low power factor wattmeter, compensation for pressure coil current is provided. TRUE [other wrong options] [Discuss in forum] FALSE |
Q31 ⇒ In a ballistic galvanometer, a charge of 100 μC gives a first swing of 25°. The charge required to cause first swing of 50° is 400 μC [other wrong options] [Discuss in forum] 200 μC 50 μC 25 μC |
Q32 ⇒ Two voltmeters 0-250 V each having resistances of 5 kΩ and 10 kΩ respectively and are connected in series. To ensure that neither of them goes beyond scale the total voltage which can be applied should be less than 375 V [other wrong options] [Discuss in forum] 500 V 400 V 250 V |
Q33 ⇒ When deflecting torque and braking torque in an energy meter are zero, the disc rotates at steady speed [other wrong options] [Discuss in forum] the disc is stationary the disc accelerates the disc retards |
Q34 ⇒ Magnetic flux density has the dimensions MI-1T-2 [other wrong options] [Discuss in forum] M-1I-2T-2 ML-3T-2 MI-1T-3 |
Q35 ⇒ If eddy current damping is to be used, the disc of instrument should be conducting and non-magnetic [other wrong options] [Discuss in forum] non-conducting and non-magnetic conducting and magnetic non-conducting and magnetic |
Q36 ⇒ Magnetic effect of current is used in ammeters, voltmeters, wattmeters and energy meters [other wrong options] [Discuss in forum] ammeters voltmeters wattmeters |
Q37 ⇒ Which of the following are needed both for protection and metering? Instrument transformers [other wrong options] [Discuss in forum] Wattmeters Energy meters Power factor meters |
Q38 ⇒ In an induction wattmeter, the shading bands are made of non conducting material. FALSE [other wrong options] [Discuss in forum] TRUE |
Q39 ⇒ A thermocouple instrument can be used over a very wide frequency range. TRUE [other wrong options] [Discuss in forum] FALSE |
Q40 ⇒ Induction wattmeter can be used in ac circuit only [other wrong options] [Discuss in forum] dc circuit only both ac and dc circuit ac 3 phase only |
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