Quantity that remains unchanged in a transformer is
|
(a) Voltage |
(b) Current |
(c) Frequency |
(d) None of the above |
Quantity that remains unchanged in a transformer is
|
(a) Voltage |
(b) Current |
(c) Frequency |
(d) None of the above |
(c) Frequency
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
For substances hysteresis (B - H) curves are given as shown in figure. For making temporary magnet which of the following is best.
|
(a) |
(b) |
(c) |
(d) |
A thermoelectric refrigerator works on
|
(a) Joule effect |
(b) Seeback effect |
(c) Peltier effect |
(d) Thermonic emission |
The minimum temperature of a body at which it emits light is
|
(a) 1200°C |
(b) 1000°C |
(c) 500°C |
(d) 200°C |
A galvanometer of resistance 20 W is to be converted into an ammeter of range 1 A. If a current of 1 mA produces full scale deflection, the shunt required for the purpose is
|
(a) 0.01 W |
(b) 0.05 W |
(c) 0.02 W |
(d) 0.04 W |
The ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum is
|
(a) 27 : 5 |
(b) 5 : 27 |
(c) 4 : 1 |
(d) 1 : 4 |
In an LR-circuit, time constant is that time in which current grows from zero to the value (where
is the steady state current)
|
(a) |
(b) |
(c) |
(d) |