Question: In a broadcast receiver, most of the selectivity is achieved in –
1. 1 F stage
2. R F stage
3. Audio stage
4. None of these
Answer: 2
Question: In a zener diode regulator, zener –
1. Is kept reverse biased
2. Is kept forward biased
3. Depends upon current requireemnt
4. Depends upon rated voltage
Answer: 3
Question: The EMF of every cell of full charge battery is –
1. 1.18v
2. 2.0v
3. 2.2v
4. 2.4v
Answer: 4
Question: The colour code of 47k Ω ± 20% resister will be –
1. Orange, Blue, Yellow, Silver
2. Yellow, Violet, Orange
3. Yellow, Violet, Orange, Silver
4. Yellow, Violet, Orange, Gold
Answer: 4
Question: An amplifier is said to suffer from distortion when its output is
1. Low
2. Different from input
3. Noisy
4. Larger than its input
Answer: 3
Question: Sound in TV is modulating –
1. AM
2. FM
3. PCM
4. PM
Answer: 1
Question: The spacing between picture carrier and sound carrier frequency in T.V. is –
1. 7 MHZ
2. 5.5 MHZ
3. 5 MHZ
4. None of these
Answer: 2
Question: Selectivity of a receiver can be increased by –
1. Using more tuned circuit
2. Decreasing number of tuned circuits
3. Using loud speaker
4. Increasing gain of the receiver
Answer: 2
Question: What will happen if a transformer is connected to D.C. voltage?
1. It will induce more voltage
2. Its reactance will increase
3. The primary will burn out and no emf will be induced in the secondary
4. None of these
Answer: 3
Question: 1 KHZ signal is used to test which stage?
1. Mixer stage
2. 1 F stage
3. Detector stage
4. Audio stage
Answer: 2
Question: Tesla is a unit of magnetic –
1. field
2. flux
3. induction
4. moment
Answer: 1
Question: The unit of noise pollution (level) is –
1. decibel
2. decimal
3. ppm
4. None of these
Answer: 1
Question: Transition ions absorb light in –
1. visible region
2. infrared region
3. ultraviolet region
4. microwave region
Answer: 1
Question: The threshold frequency is the frequency below which –
1. photo current is constant
2. photo current increases with voltage
3. photo current decreases with voltage
4. photo electric emission is not possible
Answer: 4
Question: The damage of the human body due to radiation (χ-rays or γ-rays etc,) is measured in –
1. Rads
2. Rems
3. Roentgen
4. Curie
Answer: 1