127. A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is
A. I 00 kV/m
B. 10 kV/m
C. 5 kV/m
D. 2 kV/m
128. The ohmmeter reading for a short circuited capacitor is
A. infinity
B. few kilo ohms
C. few megaohms
D. zero
129. Which of the following statements is correct?
A. Mica capacitors are available in capacitance values of 5 to 20 RP
B. air capacitors have a black band to indicate the outside foil
C. Electrolytic capacitors must be connected in correct polarity
D. Ceramic capacitors must be connected in correct polarity
130. Which of the following capacitors preferred for high frequency circuits?
A. Air capacitor
B. Electrolytic capacitor
C. Mica capacitor
D. none of the above
131. An electrolytic capacitor is made to provide
A. low capacitance
B. fixed capacitance
C. variable capacitance
D. large value of capacitance
132. In order to remove static electricity from machinery
A. construct insulated cabins
B. insulate the machinery
C. ground the framework
D. humidify the surroundings
133. ®ion around a stationary electric charge has
A. an electric field
B. a magnetic field
C. both and
D. none of the above
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