## electrician

### MCQ ON MEASURING INSTRUMENT PAGE - 2

1.
 An electrodynamic meter can be used to measure A A.c. voltage B D.c. voltage C D.c. as well as a.c voltage D D.c. voltage but for a.c voltage rectification is necessary Answer : C Explanation :
2.
 Megger is an instrument meant for measuring A Very low resistance B Insulation resistance C Inductance of a coil D Q of a coil Answer : B Explanation :
3.
 A multimeter consists of A Voltmeter and ohmmeter B Voltmeter and ammeter C Voltmeter, ammeter and ohmmeter D None of these Answer : C Explanation :
4.
 A VTVM is more reliable than a multimeter for measuring voltage across a low impedance because : A Its sensitivity is very high B It offers a high impedance C It does not alter the voltage measured D All of these. Answer : D Explanation :
5.
 Induction type single-phase energy meter is A An ampere hour meter B A true watt hour meter C A watt meter D None of these Answer : B Explanation :
6.
 A wattmeter can measure A A.c power only B D.c. power only C A.c. as well as dc power D D.c power and ac power after rectification Answer : C Explanation :
7.
 A multimeter cannot be measuring A Current B Potential difference C Capacitance D Resistance Answer : C Explanation :
8.
 Which of the following electric quantities can be measured by a moving coil instrument? A D.C current and D.C voltage B D.C and A.C current C A.C voltage D A.C current Answer : A Explanation :
9.
 When the electric supply is ON then which of the following instruments should not be used? A Wattmeter and power factor meter B Frequency meter and tong tester C Phase sequence meter and energy meter D Ohm meter and megger Answer : D Explanation :
10.
 Which of the electrical instruments have to be connected in the same manner for measurement? A Frequency meter and P.F meter B Voltmeter and  frequency meter C Voltmeter and power factor meter D Watt meter and voltmeter Answer : B Explanation :
11.
 Voltmeters of high internal resistance should be used for voltage measurements in circuits of high resistance. The reason for this is to A Avoid overloading the resistor when measuring its voltage B Avoid inaccuracy when the temperature changes C Keep the measurement error small due to the internal consumption (voltage drop) of the meter D Prevent the meter from overloading Answer : C Explanation :
12.
 Tong tester is used to measure the current in a.c. circuits without interrupting the circuit. For measurement, the split core is clamped on to the insulated current-carrying conductor.  Loopin A Double the current which passes through the conductor B 4 times (i.e 22) the current which passes through the conductor C Half the current which passes through the conductor D Same as the conductor current Answer : A Explanation :
13.
 Power drawn by a welding shop which has 3-phase, 415 V 50 Hz supply has to be measured The following loads are connected: 2 welding sets each of 5kVa across L1, L& A 3 element, 3 wire type, 3-phase wattmeter B One single phase wattmeter connected between any two phases and multiply reading by 3 C 3 element, 4 wire type 3-phase wattmeter D 2 element type 3-phase wattmeter Answer : D Explanation :
14.
 One screw is provided in M.C instrument which is attached to the pointer. What for it is provided? A To adjust the sensitivity of the meter B To correct the zero position of the pointer C To tight the moving part of the meter D To change the measuring range of the meter Answer : B Explanation :
15.
 A voltmeter with a sensitivity of 1 kilo ohm per volt will have a resistance of … A 1000 B 5000 C 50000 D 50 Answer : C Explanation :
16.
 Electrical instruments may be classified based on …categories A 2 B 4 C 3 D 5 Answer : B Explanation :
17.
 Which instrument is used for measuring voltage? A Ammeter B Voltmeter C Ohmmeter D Multimeter Answer : B Explanation :
18.
 Which instrument is used  for measuring the insulation resistance ? A Ohm meter B Voltmeter C Ammeter D Megger Answer : D Explanation :
19.
 The fore required for moving the pointer in an indicating instruments is … A Deflecting force B Controlling force C Eddy current damping force D Air friction damping force Answer : A Explanation :
20.
 The operation of a Megger is based on A Moving iron meter B Electrodynamic meter C Electrostatic meter D Moving coil meter Answer : D Explanation :