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101.	Turns ration for a C.T. is _________(a) n = ^Np ⁄ Ns(b) n = ^Ns ⁄ Np(c) n = ^1 ⁄ Np(d) n = NsThe question was asked during an interview.My doubt stems from Instrument Transformers in chapter Extension of Instrument Ranges of Electrical Measurements
Answer» Right OPTION is (a) N = ^Np ⁄ Ns To explain I would say: The turns ratio for a P.T. is DEFINED as the ratio of the number of turns in the primary to the number of turns in the SECONDARY. It is given by the relation n = ^Np⁄Ns.

102.	The secondary winding of a C.T. has _________(a) a large number of turns(b) a few turns(c) no turns at all(d) intermediate number of turnsThis question was addressed to me during an interview for a job.I need to ask this question from Instrument Transformers topic in section Extension of Instrument Ranges of Electrical Measurements
Answer» RIGHT choice is (a) a LARGE number of turns For explanation I would say: Secondary winding of a C.T. has a large number of turns. It is CONNECTED in series to an AMMETER through which a small portion of the current flows through.

103.	The primary winding of a P.T. has _________(a) intermediate number of turns(b) no turns at all(c) a larger number of turns(d) a few turnsThis question was posed to me in an online interview.My question is taken from Instrument Transformers topic in section Extension of Instrument Ranges of Electrical Measurements
Answer» Correct CHOICE is (c) a LARGER NUMBER of turns Easy explanation: The primary winding of a P.T. has a very LARGE number of turns. It is connected in parallel with the load whose voltage is to be MEASURED.

104.	The primary winding of a C.T. has _________(a) a larger number of turns(b) no turns at all(c) intermediate number of turns(d) a few turnsThis question was addressed to me during an interview.Enquiry is from Instrument Transformers in section Extension of Instrument Ranges of Electrical Measurements
Answer» CORRECT option is (d) a few turns The explanation is: The PRIMARY winding of a C.T. has a very few number of turns. It is CONNECTED in series with the load circuit through which the primary current FLOWS.

105.	C.T. and P.T. are used for _________(a) measuring low current and voltages(b) measuring very low current and voltages(c) measuring high currentsand voltages(d) measuring intermediate currents and voltagesThe question was asked during an interview.Question is from Instrument Transformers topic in chapter Extension of Instrument Ranges of Electrical Measurements
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106.	What is the potential transformer?(a) transformer used with an D.C. ammeter(b) transformer used with an A.C. voltmeter(c) transformer used with an D.C. ammeter(d) transformer used with an A.C. voltmeterThis question was posed to me in semester exam.I'm obligated to ask this question of Instrument Transformers in division Extension of Instrument Ranges of Electrical Measurements
Answer» The CORRECT choice is (b) transformer used with an A.C. voltmeter To explain I WOULD SAY: A transformer used to extend the RANGE of an A.C. voltmeter is KNOWN as a potential transformer. A potential transformer is also abbreviated as P.T.

107.	What is the condition for using a multiplier in A.C. voltmeters?(a) by using ac supply(b) by maintaining a uniform impedance(c) by maintaining a uniform frequency(d) by using a galvanometerThis question was addressed to me in an interview.This intriguing question comes from Shunts and Multipliers in section Extension of Instrument Ranges of Electrical Measurements
Answer» The correct answer is (c) by maintaining a uniform frequency Easy explanation: A multiplier can be used for A.C. VOLTMETERS. The condition to be satisfied is that the total IMPEDANCE of the VOLTMETER and the multiplier CIRCUIT must be constant for a wide range of frequencies.

108.	What is the current transformer?(a) transformer used with an A.C. ammeter(b) transformer used with an D.C. ammeter(c) transformer used with an A.C. voltmeter(d) transformer used with an D.C. voltmeterThe question was posed to me in unit test.Enquiry is from Instrument Transformers topic in division Extension of Instrument Ranges of Electrical Measurements
Answer» Correct CHOICE is (a) TRANSFORMER USED with an A.C. ammeter Easiest explanation: A transformer used to extend the range of an A.C. ammeter is KNOWN as a current transformer. A current transformer is also ABBREVIATED as C.T.

109.	A multiplier is __________(a) non-inductive(b) resistive(c) capacitive(d) non-capacitiveI have been asked this question in an online quiz.This interesting question is from Shunts and Multipliers topic in division Extension of Instrument Ranges of Electrical Measurements
Answer» Correct CHOICE is (a) non-inductive Best explanation: A multiplier is basically a non-inductive, high RESISTANCE that is USED to extend the range of a D.C. VOLTMETER. Multiplier consists of a low range D.C. voltmeter CONNECTED in series with it.

110.	What is the effect of the ammeter range on the shunt resistance?(a) no effect(b) varies by a factor of multiplying factor(c) varies by a factor of the resistance(d) varies by a factor of unityThe question was asked in a job interview.My question is from Shunts and Multipliers in division Extension of Instrument Ranges of Electrical Measurements
Answer» RIGHT choice is (B) varies by a FACTOR of multiplying factor Easy explanation: We know that N = 1 + ^Ra⁄Rs where, N is the multiplying factor Ra is the ammeter resistance Rs is the shunt resistance It is CLEAR from the above equation that in order to increase the ammeter range by N times, the shunt resistance is EQUIVALENT to ^1⁄N-1.

111.	Potential terminals have a __________(a) high current capacity(b) low voltage capacity(c) low current capacity(d) high voltage capacityI have been asked this question at a job interview.My question is based upon Shunts and Multipliers in portion Extension of Instrument Ranges of Electrical Measurements
Answer» Correct answer is (c) LOW CURRENT CAPACITY For EXPLANATION: A SHUNT is normally a very low value of resistance, connected in parallel with the ammeter coil. In a shunt, the potential terminals have a low current carrying capacity. As a result, a low range ammeter is used to measure the large current.

112.	In case of AC ammeters, shunts consist of __________(a) impedance(b) capacitance(c) resistance(d) inductanceI got this question at a job interview.Asked question is from Shunts and Multipliers in section Extension of Instrument Ranges of Electrical Measurements
Answer» Right CHOICE is (d) inductance The explanation is: AC ammeter shunts comprise of the INDUCTANCES of the ammeter as WELL as the shunt. In order to EXTEND the RANGE of an AC ammeter, inductances of the ammeter and the shunt are taken into account.

113.	Current terminals have a small current capacity.(a) True(b) FalseThis question was addressed to me during an online interview.This interesting question is from Shunts and Multipliers in portion Extension of Instrument Ranges of Electrical Measurements
Answer» The CORRECT option is (b) False The best I can explain: A shunt is normally a very low VALUE of RESISTANCE, connected in parallel with the ammeter COIL. In a shunt, the current terminals have a large current capacity and are connected in series.

114.	A shunt can be used to measure large currents.(a) True(b) FalseThis question was addressed to me in an internship interview.This key question is from Shunts and Multipliers topic in division Extension of Instrument Ranges of Electrical Measurements
Answer» Correct answer is (a) True For explanation I would SAY: A shunt is NORMALLY a very low value of resistance, connected in parallel with the ammeter coil. By MAKING use of a low range ammeter, large CURRENT VALUES can be measured through a shunt.

115.	A shunt is a __________(a) very high resistance(b) medium resistance(c) very low resistance(d) high resistanceThis question was posed to me in an online interview.The question is from Shunts and Multipliers topic in section Extension of Instrument Ranges of Electrical Measurements
Answer» Correct choice is (c) very LOW resistance Best explanation: Usually shunt is a very low value of resistance. It is CONNECTED in parallel with the ammeter COIL. Through this we can EXTEND the RANGE of an ammeter.

116.	Moving coil instruments have a current and voltage rating of __________(a) 100 A and 25 V(b) 50 mA and 50 mV(c) 75 nA and 100 μV(d) 25 μA and 75 VI had been asked this question in an interview for internship.This interesting question is from Shunts and Multipliers topic in division Extension of Instrument Ranges of Electrical Measurements
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117.	Range of an electrical instrument depends on __________(a) current(b) voltage(c) power(d) resistanceI had been asked this question by my college director while I was bunking the class.My question is based upon Shunts and Multipliers in section Extension of Instrument Ranges of Electrical Measurements
Answer» RIGHT answer is (a) current Explanation: The amount of current safely passing through the coil of the INSTRUMENT and the spiral SPRINGS. This ACTS as the leads of the current to the instrument. As a RESULT, the range of an electrical instrument depends on the current.

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