G.K. Practice Test: Question Set - 08
1. The efficiency of a transformer is usually of the order of
- (A) 33 %
- (B) 50 %
- (C) 75 %
- (D) 98 %
2. The dielectric strength of transformer oil should be of the order of
- (A) 415 kV
- (B) 6.6 kV
- (C) 11 kV
- (D) 30 kV
3. If the secondary winding of the current transformer is opened when current is flowing in the primary current, then following will result
- (A) There will
be high current in the secondary winding
- (B) There
will be very high induced voltage in the secondary winding
- (C) There
will be very weak flux density in the core
- (D) The
transformer will burn immediately
4. It is possible to extend the range of an A.C ammeter by using
- (A) Current
transformer (CT)
- (B) Shunt
- (C) Capacitor
- (D) Inductor
coil
5. Which of the following voltmeters should be selected for most accurate reading?
- (A) 100 V, 1 A
- (B) 100 V, 100
ohms/volt
- (C) 100 V, 1 mA
- (D) 100 V, 100
mA
6. Which of the following instrument will be used to measure alternating current?
- (A) Moving iron
voltmeter
- (B) Permanent
magnet type ammeter
- (C) Induction
type ammeter
- (D) Moving
iron (attraction type) ammeter
7. The internal impedance of an accurate voltmeter should be
- (A) As low as
possible
- (B) Low
- (C) Negligible
- (D) Very high
8. A moving coil instrument can be used to measure
- (A) Low
frequency alternating current
- (B) High frequency
alternating current
- (C) Direct
current
- (D) Direct
current and alternating current both
9. Which of the following statement is true?
- (A) A
galvanometer with low resistance in series is an ammeter
- (B) A
galvanometer with high resistance in series is an ammeter
- (C) A
galvanometer with high resistance in parallel is a voltmeter
- (D) A
galvanometer with low resistance in parallel is a voltmeter
10. High current of the order of 100 A can be measured by an ammeter of 0 - 1 A rating by using
- (A) Shunt
- (B) Capacitor
- (C) R-C network
- (D) Current
transformer
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