1. In order to create stationary magnetic field in permanent magnet moving coil instrument it uses
(A) only one permanent magnet.
(B) two permanent magnets.
(C) electromagnet.
(D) none of the above.
Answer ⇓
2. Schering bridge is used to
(A) determine capacitance.
(B) determine inductance.
(C) measure low resistance.
(D) measure high resistance.
Answer ⇓
3. If an instrument has cramped scale for larger values, then it follows
(A) ohm law.
(B) square law.
(C) logarithmic law.
(D) uniform law.
Answer ⇓
4. Class B amplifier is biased
(A) at midpoint of load line.
(B) just at cut-off.
(C) nearly twice cut-off.
(D) none of the above.
Answer ⇓
5. The method for measuring high value of inductance is the
(A) Whitestone wein bridge.
(B) Maxwell Wein bridge.
(C) Hay’s bridge.
(D) Heavinside bridge.
Answer ⇓
6. Magger is a combination of
(A) motor and generator.
(B) generator and voltmeter.
(C) generator and ammeter.
(D) generator and ohm meter.
Answer ⇓
7. Megger is an instrument used for the measurement of
(A) medium resistance.
(B) high resistance and insulation resistance.
(C) low resistance.
(D) leakage current.
Answer ⇓
8. Swamping of resistance is used to compensate error due to
(A) frequencty variations.
(B) stray magnetic field.
(C) temperature variations.
(D) large supply variations.
Answer ⇓
9. A Dynamometer type wattmeter responds to the
(A) average value of the active power.
(B) average value of the reactive power.
(C) peak value of the active power.
(D) peak value of the reactive power.
Answer ⇓
10. Anderson bridge is used to measure of
(A) resistance.
(B) inductance.
(C) capacitance.
(D) time period.
Answer ⇓
11. Kelvin double bridge is best suited for the measurement of
(A) inductance.
(B) capacitance.
(C) low resistance.
(D) high resistance.
Answer ⇓
12. When cells are arranged in parallel
(A) the current capacity increases.
(B) the current capacity decreases.
(C) the e.m.f increases.
(D) the e.m.f decreases.
Answer ⇓
13. Induction type single phase energy meters measure electric energy in
(A) kW.
(B) Wh.
(C) kWh.
(D) VAR.
Answer ⇓
14. An ammeter is a
(A) secondary instrument.
(B) absolute instrument.
(C) recording instrument.
(D) integrating instrument.
Answer ⇓
15. When the pointer of an indicating instrument is in the final deflection position, at that time
(A) deflection torque is zero.
(B) controlling torque is zero.
(C) damping torque is zero.
(D) both deflecting and controlling torque are zero.